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JavaScript常用工具函式大全

本文例項總結了JavaScript常用工具函式。分享給大家供大家參考,具體如下:

為元素新增on方法

Element.prototype.on = Element.prototype.addEventListener;

NodeList.prototype.on = function (event,fn) {、
 []['forEach'].call(this,function (el) {
  el.on(event,fn);
 });
 return this;
};

為元素新增trigger方法

Element.prototype.trigger = function(type,data) {
 var event = document.createEvent("HTMLEvents");
 event.initEvent(type,true,true);
 event.data = data || {};
 event.eventName = type;
 event.target = this;
 this.dispatchEvent(event);
 return this;
};

NodeList.prototype.trigger = function(event) {
 []["forEach"].call(this,function(el) {
 el["trigger"](event);
 });
 return this;
};

轉義html標籤

function HtmlEncode(text) {
 return text
 .replace(/&/g,"&")
 .replace(/\"/g,'"')
 .replace(/</g,"<")
 .replace(/>/g,">");
}

HTML標籤轉義

// HTML 標籤轉義
// @param {Array.<DOMString>} templateData 字串型別的tokens
// @param {...} ..vals 表示式佔位符的運算結果tokens
//
function SaferHTML(templateData) {
 var s = templateData[0];
 for (var i = 1; i < arguments.length; i++) {
 var arg = String(arguments[i]);
 // Escape special characters in the substitution.
 s += arg
  .replace(/&/g,"&amp;")
  .replace(/</g,"&lt;")
  .replace(/>/g,"&gt;");
 // Don't escape special characters in the template.
 s += templateData[i];
 }
 return s;
}
// 呼叫
var html = SaferHTML`<p>這是關於字串模板的介紹</p>`;

跨瀏覽器繫結事件

function addEventSamp(obj,evt,fn) {
 if (!oTarget) {
 return;
 }
 if (obj.addEventListener) {
 obj.addEventListener(evt,fn,false);
 } else if (obj.attachEvent) {
 obj.attachEvent("on" + evt,fn);
 } else {
 oTarget["on" + sEvtType] = fn;
 }
}

加入收藏夾

function addFavorite(sURL,sTitle) {
 try {
 window.external.addFavorite(sURL,sTitle);
 } catch (e) {
 try {
  window.sidebar.addPanel(sTitle,sURL,"");
 } catch (e) {
  alert("加入收藏失敗,請使用Ctrl+D進行新增");
 }
 }
}

提取頁面程式碼中所有網址

var aa = document.documentElement.outerHTML
 .match(
 /(url\(|src=|href=)[\"\']*([^\"\'\(\)\<\>\[\] ]+)[\"\'\)]*|(http:\/\/[\w\-\.]+[^\"\'\(\)\<\>\[\] ]+)/gi
 )
 .join("\r\n")
 .replace(/^(src=|href=|url\()[\"\']*|[\"\'\>\) ]*$/gim,"");
alert(aa);

動態載入指令碼檔案

function appendscript(src,text,reload,charset) {
 var id = hash(src + text);
 if (!reload && in_array(id,evalscripts)) return;
 if (reload && $(id)) {
 $(id).parentNode.removeChild($(id));
 }

 evalscripts.push(id);
 var scriptNode = document.createElement("script");
 scriptNode.type = "text/javascript";
 scriptNode.id = id;
 scriptNode.charset = charset
 ? charset
 : BROWSER.firefox
 ? document.characterSet
 : document.charset;
 try {
 if (src) {
  scriptNode.src = src;
  scriptNode.onloadDone = false;
  scriptNode.onload = function() {
  scriptNode.onloadDone = true;
  JSLOADED[src] = 1;
  };
  scriptNode.onreadystatechange = function() {
  if (
   (scriptNode.readyState == "loaded" ||
   scriptNode.readyState == "complete") &&
   !scriptNode.onloadDone
  ) {
   scriptNode.onloadDone = true;
   JSLOADED[src] = 1;
  }
  };
 } else if (text) {
  scriptNode.text = text;
 }
 document.getElementsByTagName("head")[0].appendChild(scriptNode);
 } catch (e) {}
}

返回頂部的通用方法

function backTop(btnId) {
 var btn = document.getElementById(btnId);
 var d = document.documentElement;
 var b = document.body;
 window.onscroll = set;
 btn.style.display = "none";
 btn.onclick = function() {
 btn.style.display = "none";
 window.onscroll = null;
 this.timer = setInterval(function() {
  d.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);
  b.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);
  if (d.scrollTop + b.scrollTop == 0)
  clearInterval(btn.timer,(window.onscroll = set));
 },10);
 };
 function set() {
 btn.style.display = d.scrollTop + b.scrollTop > 100 ? "block" : "none";
 }
}
backTop("goTop");

實現base64解碼

function base64_decode(data) {
 var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
 var o1,o2,o3,h1,h2,h3,h4,bits,i = 0,ac = 0,dec = "",tmp_arr = [];
 if (!data) {
 return data;
 }
 data += "";
 do {
 h1 = b64.indexOf(data.charAt(i++));
 h2 = b64.indexOf(data.charAt(i++));
 h3 = b64.indexOf(data.charAt(i++));
 h4 = b64.indexOf(data.charAt(i++));
 bits = (h1 << 18) | (h2 << 12) | (h3 << 6) | h4;
 o1 = (bits >> 16) & 0xff;
 o2 = (bits >> 8) & 0xff;
 o3 = bits & 0xff;
 if (h3 == 64) {
  tmp_arr[ac++] = String.fromCharCode(o1);
 } else if (h4 == 64) {
  tmp_arr[ac++] = String.fromCharCode(o1,o2);
 } else {
  tmp_arr[ac++] = String.fromCharCode(o1,o3);
 }
 } while (i < data.length);
 dec = tmp_arr.join("");
 dec = utf8_decode(dec);
 return dec;
}

確認是否是鍵盤有效輸入值

function checkKey(iKey) {
 if (iKey == 32 || iKey == 229) {
 return true;
 } /*空格和異常*/
 if (iKey > 47 && iKey < 58) {
 return true;
 } /*數字*/
 if (iKey > 64 && iKey < 91) {
 return true;
 } /*字母*/
 if (iKey > 95 && iKey < 108) {
 return true;
 } /*數字鍵盤1*/
 if (iKey > 108 && iKey < 112) {
 return true;
 } /*數字鍵盤2*/
 if (iKey > 185 && iKey < 193) {
 return true;
 } /*符號1*/
 if (iKey > 218 && iKey < 223) {
 return true;
 } /*符號2*/
 return false;
}

全形半形轉換

//iCase: 0全到半,1半到全,其他不轉化
function chgCase(sStr,iCase) {
 if (
 typeof sStr != "string" ||
 sStr.length <= 0 ||
 !(iCase === 0 || iCase == 1)
 ) {
 return sStr;
 }
 var i,oRs = [],iCode;
 if (iCase) {
 /*半->全*/
 for (i = 0; i < sStr.length; i += 1) {
  iCode = sStr.charCodeAt(i);
  if (iCode == 32) {
  iCode = 12288;
  } else if (iCode < 127) {
  iCode += 65248;
  }
  oRs.push(String.fromCharCode(iCode));
 }
 } else {
 /*全->半*/
 for (i = 0; i < sStr.length; i += 1) {
  iCode = sStr.charCodeAt(i);
  if (iCode == 12288) {
  iCode = 32;
  } else if (iCode > 65280 && iCode < 65375) {
  iCode -= 65248;
  }
  oRs.push(String.fromCharCode(iCode));
 }
 }
 return oRs.join("");
}

版本對比

function compareVersion(v1,v2) {
 v1 = v1.split(".");
 v2 = v2.split(".");

 var len = Math.max(v1.length,v2.length);

 while (v1.length < len) {
 v1.push("0");
 }

 while (v2.length < len) {
 v2.push("0");
 }

 for (var i = 0; i < len; i++) {
 var num1 = parseInt(v1[i]);
 var num2 = parseInt(v2[i]);

 if (num1 > num2) {
  return 1;
 } else if (num1 < num2) {
  return -1;
 }
 }
 return 0;
}

壓縮CSS樣式程式碼

function compressCss(s) {
 //壓縮程式碼
 s = s.replace(/\/\*(.|\n)*?\*\//g,""); //刪除註釋
 s = s.replace(/\s*([\{\}\:\;\,])\s*/g,"$1");
 s = s.replace(/\,[\s\.\#\d]*\{/g,"{"); //容錯處理
 s = s.replace(/;\s*;/g,";"); //清除連續分號
 s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白
 return s == null ? "" : s[1];
}

獲取當前路徑

var currentPageUrl = "";
if (typeof this.href === "undefined") {
 currentPageUrl = document.location.toString().toLowerCase();
} else {
 currentPageUrl = this.href.toString().toLowerCase();
}

字串長度擷取

function cutstr(str,len) {
 var temp,icount = 0,patrn = /[^\x00-\xff]/,
  strre = "";
 for (var i = 0; i < str.length; i++) {
  if (icount < len - 1) {
   temp = str.substr(i,1);
    if (patrn.exec(temp) == null) {
     icount = icount + 1
   } else {
    icount = icount + 2
   }
   strre += temp
   } else {
   break;
  }
 }
 return strre + "..."
}

時間日期格式轉換

Date.prototype.format = function(formatStr) {
 var str = formatStr;
 var Week = ["日","一","二","三","四","五","六"];
 str = str.replace(/yyyy|YYYY/,this.getFullYear());
 str = str.replace(
 /yy|YY/,this.getYear() % 100 > 9
  ? (this.getYear() % 100).toString()
  : "0" + (this.getYear() % 100)
 );
 str = str.replace(
 /MM/,this.getMonth() + 1 > 9
  ? (this.getMonth() + 1).toString()
  : "0" + (this.getMonth() + 1)
 );
 str = str.replace(/M/g,this.getMonth() + 1);
 str = str.replace(/w|W/g,Week[this.getDay()]);
 str = str.replace(
 /dd|DD/,this.getDate() > 9 ? this.getDate().toString() : "0" + this.getDate()
 );
 str = str.replace(/d|D/g,this.getDate());
 str = str.replace(
 /hh|HH/,this.getHours() > 9 ? this.getHours().toString() : "0" + this.getHours()
 );
 str = str.replace(/h|H/g,this.getHours());
 str = str.replace(
 /mm/,this.getMinutes() > 9
  ? this.getMinutes().toString()
  : "0" + this.getMinutes()
 );
 str = str.replace(/m/g,this.getMinutes());
 str = str.replace(
 /ss|SS/,this.getSeconds() > 9
  ? this.getSeconds().toString()
  : "0" + this.getSeconds()
 );
 str = str.replace(/s|S/g,this.getSeconds());
 return str;
};

// 或
Date.prototype.format = function(format) {
 var o = {
 "M+": this.getMonth() + 1,//month
 "d+": this.getDate(),//day
 "h+": this.getHours(),//hour
 "m+": this.getMinutes(),//minute
 "s+": this.getSeconds(),//second
 "q+": Math.floor((this.getMonth() + 3) / 3),//quarter
 S: this.getMilliseconds() //millisecond
 };
 if (/(y+)/.test(format))
 format = format.replace(
  RegExp.$1,(this.getFullYear() + "").substr(4 - RegExp.$1.length)
 );
 for (var k in o) {
 if (new RegExp("(" + k + ")").test(format))
  format = format.replace(
  RegExp.$1,RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length)
  );
 }
 return format;
};
alert(new Date().format("yyyy-MM-dd hh:mm:ss"));

跨瀏覽器刪除事件

function delEvt(obj,fn) {
 if (!obj) {
 return;
 }
 if (obj.addEventListener) {
 obj.addEventListener(evt,false);
 } else if (oTarget.attachEvent) {
 obj.attachEvent("on" + evt,fn);
 } else {
 obj["on" + evt] = fn;
 }
}

判斷是否以某個字串結束

String.prototype.endWith = function(s) {
 var d = this.length - s.length;
 return d >= 0 && this.lastIndexOf(s) == d;
};

返回指令碼內容

function evalscript(s) {
 if (s.indexOf("<script") == -1) return s;
 var p = /<script[^\>]*?>([^\x00]*?)<\/script>/gi;
 var arr = [];
 while ((arr = p.exec(s))) {
 var p1 = /<script[^\>]*?src=\"([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i;
 var arr1 = [];
 arr1 = p1.exec(arr[0]);
 if (arr1) {
  appendscript(arr1[1],"",arr1[2],arr1[3]);
 } else {
  p1 = /<script(.*?)>([^\x00]+?)<\/script>/i;
  arr1 = p1.exec(arr[0]);
  appendscript("",arr1[1].indexOf("reload=") != -1);
 }
 }
 return s;
}

格式化CSS樣式程式碼

function formatCss(s) {
 //格式化程式碼
 s = s.replace(/\s*([\{\}\:\;\,"$1");
 s = s.replace(/;\s*;/g,";"); //清除連續分號
 s = s.replace(/\,[\s\.\#\d]*{/g,"{");
 s = s.replace(/([^\s])\{([^\s])/g,"$1 {\n\t$2");
 s = s.replace(/([^\s])\}([^\n]*)/g,"$1\n}\n$2");
 s = s.replace(/([^\s]);([^\s\}])/g,"$1;\n\t$2");
 return s;
}

獲取cookie值

function getCookie(name) {
 var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
 if (arr != null) return unescape(arr[2]);
 return null;
}

獲得URL中GET引數值

// 用法:如果地址是 test.htm?t1=1&t2=2&t3=3,那麼能取得:GET["t1"],GET["t2"],GET["t3"]
function getGet() {
 querystr = window.location.href.split("?");
 if (querystr[1]) {
 GETs = querystr[1].split("&");
 GET = [];
 for (i = 0; i < GETs.length; i++) {
  tmp_arr = GETs.split("=");
  key = tmp_arr[0];
  GET[key] = tmp_arr[1];
 }
 }
 return querystr[1];
}

獲取移動裝置初始化大小

function getInitZoom() {
 if (!this._initZoom) {
 var screenWidth = Math.min(screen.height,screen.width);
 if (this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()) {
  screenWidth = screenWidth / window.devicePixelRatio;
 }
 this._initZoom = screenWidth / document.body.offsetWidth;
 }
 return this._initZoom;
}

獲取頁面高度

function getPageHeight() {
 var g = document,a = g.body,f = g.documentElement,d = g.compatMode == "BackCompat" ? a : g.documentElement;
 return Math.max(f.scrollHeight,a.scrollHeight,d.clientHeight);
}

獲取頁面scrollLeft

function getPageScrollLeft() {
 var a = document;
 return a.documentElement.scrollLeft || a.body.scrollLeft;
}

獲取頁面scrollTop

function getPageScrollTop() {
 var a = document;
 return a.documentElement.scrollTop || a.body.scrollTop;
}

獲取頁面可視高度

function getPageViewHeight() {
 var d = document,a = d.compatMode == "BackCompat" ? d.body : d.documentElement;
 return a.clientHeight;
}

獲取頁面可視寬度

function getPageViewWidth() {
 var d = document,a = d.compatMode == "BackCompat" ? d.body : d.documentElement;
 return a.clientWidth;
}

獲取頁面寬度

function getPageWidth() {
 var g = document,d = g.compatMode == "BackCompat" ? a : g.documentElement;
 return Math.max(f.scrollWidth,a.scrollWidth,d.clientWidth);
}

獲取移動裝置螢幕寬度

function getScreenWidth() {
 var smallerSide = Math.min(screen.width,screen.height);
 var fixViewPortsExperiment =
 rendererModel.runningExperiments.FixViewport ||
 rendererModel.runningExperiments.fixviewport;
 var fixViewPortsExperimentRunning =
 fixViewPortsExperiment && fixViewPortsExperiment.toLowerCase() === "new";
 if (fixViewPortsExperiment) {
 if (this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()) {
  smallerSide = smallerSide / window.devicePixelRatio;
 }
 }
 return smallerSide;
}

獲取網頁被捲去的位置

function getScrollXY() {
 return document.body.scrollTop
 ? {
  x: document.body.scrollLeft,y: document.body.scrollTop
  }
 : {
  x: document.documentElement.scrollLeft,y: document.documentElement.scrollTop
  };
}

獲取URL上的引數

// 獲取URL中的某引數值,不區分大小寫
// 獲取URL中的某引數值,不區分大小寫,// 預設是取'hash'裡的引數,
// 如果傳其他引數支援取‘search'中的引數
// @param {String} name 引數名稱
export function getUrlParam(name,type = "hash") {
 let newName = name,reg = new RegExp("(^|&)" + newName + "=([^&]*)(&|$)","i"),paramHash = window.location.hash.split("?")[1] || "",paramSearch = window.location.search.split("?")[1] || "",param;

 type === "hash" ? (param = paramHash) : (param = paramSearch);

 let result = param.match(reg);

 if (result != null) {
 return result[2].split("/")[0];
 }
 return null;
}

檢驗URL連結是否有效

function getUrlState(URL) {
 var xmlhttp = new ActiveXObject("microsoft.xmlhttp");
 xmlhttp.Open("GET",URL,false);
 try {
 xmlhttp.Send();
 } catch (e) {
 } finally {
 var result = xmlhttp.responseText;
 if (result) {
  if (xmlhttp.Status == 200) {
  return true;
  } else {
  return false;
  }
 } else {
  return false;
 }
 }
}

獲取窗體可見範圍的寬與高

function getViewSize() {
 var de = document.documentElement;
 var db = document.body;
 var viewW = de.clientWidth == 0 ? db.clientWidth : de.clientWidth;
 var viewH = de.clientHeight == 0 ? db.clientHeight : de.clientHeight;
 return Array(viewW,viewH);
}

獲取移動裝置最大化大小

function getZoom() {
 var screenWidth =
 Math.abs(window.orientation) === 90
  ? Math.max(screen.height,screen.width)
  : Math.min(screen.height,screen.width);
 if (this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()) {
 screenWidth = screenWidth / window.devicePixelRatio;
 }
 var FixViewPortsExperiment =
 rendererModel.runningExperiments.FixViewport ||
 rendererModel.runningExperiments.fixviewport;
 var FixViewPortsExperimentRunning =
 FixViewPortsExperiment &&
 (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new");
 if (FixViewPortsExperimentRunning) {
 return screenWidth / window.innerWidth;
 } else {
 return screenWidth / document.body.offsetWidth;
 }
}

判斷是否安卓移動裝置訪問

function isAndroidMobileDevice() {
 return /android/i.test(navigator.userAgent.toLowerCase());
}

判斷是否蘋果移動裝置訪問

function isAppleMobileDevice() {
 return /iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase());
}

判斷是否為數字型別

function isDigit(value) {
 var patrn = /^[0-9]*$/;
 if (patrn.exec(value) == null || value == "") {
 return false;
 } else {
 return true;
 }
}

是否是某類手機型號

// 用devicePixelRatio和解析度判斷
const isIphonex = () => {
 // X XS,XS Max,XR
 const xSeriesConfig = [
 {
  devicePixelRatio: 3,width: 375,height: 812
 },{
  devicePixelRatio: 3,width: 414,height: 896
 },{
  devicePixelRatio: 2,height: 896
 }
 ];
 // h5
 if (typeof window !== "undefined" && window) {
 const isIOS = /iphone/gi.test(window.navigator.userAgent);
 if (!isIOS) return false;
 const { devicePixelRatio,screen } = window;
 const { width,height } = screen;
 return xSeriesConfig.some(
  item =>
  item.devicePixelRatio === devicePixelRatio &&
  item.width === width &&
  item.height === height
 );
 }
 return false;
};

判斷是否移動裝置

function isMobile() {
 if (typeof this._isMobile === "boolean") {
 return this._isMobile;
 }
 var screenWidth = this.getScreenWidth();
 var fixViewPortsExperiment =
 rendererModel.runningExperiments.FixViewport ||
 rendererModel.runningExperiments.fixviewport;
 var fixViewPortsExperimentRunning =
 fixViewPortsExperiment && fixViewPortsExperiment.toLowerCase() === "new";
 if (!fixViewPortsExperiment) {
 if (!this.isAppleMobileDevice()) {
  screenWidth = screenWidth / window.devicePixelRatio;
 }
 }
 var isMobileScreenSize = screenWidth < 600;
 var isMobileUserAgent = false;
 this._isMobile = isMobileScreenSize && this.isTouchScreen();
 return this._isMobile;
}

判斷嗎是否手機號碼

function isMobileNumber(e) {
 var i =
  "134,135,136,137,138,139,150,151,152,157,158,159,187,188,147,182,183,184,178",n = "130,131,132,155,156,185,186,145,176",a = "133,153,180,181,189,177,173,170",o = e || "",r = o.substring(0,3),d = o.substring(0,4),s =
  !!/^1\d{10}$/.test(o) &&
  (n.indexOf(r) >= 0
  ? "聯通"
  : a.indexOf(r) >= 0
  ? "電信"
  : "1349" == d
  ? "電信"
  : i.indexOf(r) >= 0
  ? "移動"
  : "未知");
 return s;
}

判斷是否是移動裝置訪問

function isMobileUserAgent() {
 return /iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(
 window.navigator.userAgent.toLowerCase()
 );
}

判斷滑鼠是否移出事件

function isMouseOut(e,handler) {
 if (e.type !== "mouseout") {
 return false;
 }
 var reltg = e.relatedTarget
 ? e.relatedTarget
 : e.type === "mouseout"
 ? e.toElement
 : e.fromElement;
 while (reltg && reltg !== handler) {
 reltg = reltg.parentNode;
 }
 return reltg !== handler;
}

判斷是否Touch螢幕

function isTouchScreen() {
 return (
 "ontouchstart" in window ||
 (window.DocumentTouch && document instanceof DocumentTouch)
 );
}

判斷是否為網址

function isURL(strUrl) {
 var regular = /^\b(((https?|ftp):\/\/)?[-a-z0-9]+(\.[-a-z0-9]+)*\.(?:com|edu|gov|int|mil|net|org|biz|info|name|museum|asia|coop|aero|[a-z][a-z]|((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]\d)|\d))\b(\/[-a-z0-9_:\@&?=+,.!\/~%\$]*)?)$/i;
 if (regular.test(strUrl)) {
 return true;
 } else {
 return false;
 }
}

判斷是否開啟視窗

function isViewportOpen() {
 return !!document.getElementById("wixMobileViewport");
}

載入樣式檔案

function loadStyle(url) {
 try {
 document.createStyleSheet(url);
 } catch (e) {
 var cssLink = document.createElement("link");
 cssLink.rel = "stylesheet";
 cssLink.type = "text/css";
 cssLink.href = url;
 var head = document.getElementsByTagName("head")[0];
 head.appendChild(cssLink);
 }
}

替換位址列

function locationReplace(url) {
 if (history.replaceState) {
 history.replaceState(null,document.title,url);
 history.go(0);
 } else {
 location.replace(url);
 }
}

解決offsetX相容性問題

// 針對火狐不支援offsetX/Y
function getOffset(e) {
 var target = e.target,// 當前觸發的目標物件
 eventCoord,pageCoord,offsetCoord;

 // 計算當前觸發元素到文件的距離
 pageCoord = getPageCoord(target);

 // 計算游標到文件的距離
 eventCoord = {
 X: window.pageXOffset + e.clientX,Y: window.pageYOffset + e.clientY
 };

 // 相減獲取游標到第一個定位的父元素的座標
 offsetCoord = {
 X: eventCoord.X - pageCoord.X,Y: eventCoord.Y - pageCoord.Y
 };
 return offsetCoord;
}

function getPageCoord(element) {
 var coord = { X: 0,Y: 0 };
 // 計算從當前觸發元素到根節點為止,
 // 各級 offsetParent 元素的 offsetLeft 或 offsetTop 值之和
 while (element) {
 coord.X += element.offsetLeft;
 coord.Y += element.offsetTop;
 element = element.offsetParent;
 }
 return coord;
}

開啟一個窗體通用方法

function openWindow(url,windowName,width,height) {
 var x = parseInt(screen.width / 2.0) - width / 2.0;
 var y = parseInt(screen.height / 2.0) - height / 2.0;
 var isMSIE = navigator.appName == "Microsoft Internet Explorer";
 if (isMSIE) {
 var p = "resizable=1,location=no,scrollbars=no,width=";
 p = p + width;
 p = p + ",height=";
 p = p + height;
 p = p + ",left=";
 p = p + x;
 p = p + ",top=";
 p = p + y;
 retval = window.open(url,p);
 } else {
 var win = window.open(
  url,"ZyiisPopup","top=" +
  y +
  ",left=" +
  x +
  ",scrollbars=" +
  scrollbars +
  ",dialog=yes,modal=yes,width=" +
  width +
  ",height=" +
  height +
  ",resizable=no"
 );
 eval("try { win.resizeTo(width,height); } catch(e) { }");
 win.focus();
 }
}

將鍵值對拼接成URL帶引數

export default const fnParams2Url = obj=> {
  let aUrl = []
  let fnAdd = function(key,value) {
  return key + '=' + value
  }
  for (var k in obj) {
  aUrl.push(fnAdd(k,obj[k]))
  }
  return encodeURIComponent(aUrl.join('&'))
 }

去掉url字首

function removeUrlPrefix(a) {
 a = a
 .replace(/:/g,":")
 .replace(/./g,".")
 .replace(///g,"/");
 while (
 trim(a)
  .toLowerCase()
  .indexOf("http://") == 0
 ) {
 a = trim(a.replace(/http:\/\//i,""));
 }
 return a;
}

替換全部

String.prototype.replaceAll = function(s1,s2) {
 return this.replace(new RegExp(s1,"gm"),s2);
};

resize的操作

(function() {
 var fn = function() {
 var w = document.documentElement
  ? document.documentElement.clientWidth
  : document.body.clientWidth,r = 1255,b = Element.extend(document.body),classname = b.className;
 if (w < r) {
  //當窗體的寬度小於1255的時候執行相應的操作
 } else {
  //當窗體的寬度大於1255的時候執行相應的操作
 }
 };
 if (window.addEventListener) {
 window.addEventListener("resize",function() {
  fn();
 });
 } else if (window.attachEvent) {
 window.attachEvent("onresize",function() {
  fn();
 });
 }
 fn();
})();

滾動到頂部

// 使用document.documentElement.scrollTop 或 document.body.scrollTop 獲取到頂部的距離,從頂部
// 滾動一小部分距離。使用window.requestAnimationFrame()來滾動。
// @example
// scrollToTop();
function scrollToTop() {
 var c = document.documentElement.scrollTop || document.body.scrollTop;

 if (c > 0) {
 window.requestAnimationFrame(scrollToTop);
 window.scrollTo(0,c - c / 8);
 }
}

設定cookie值

function setCookie(name,value,Hours) {
 var d = new Date();
 var offset = 8;
 var utc = d.getTime() + d.getTimezoneOffset() * 60000;
 var nd = utc + 3600000 * offset;
 var exp = new Date(nd);
 exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);
 document.cookie =
 name +
 "=" +
 escape(value) +
 ";path=/;expires=" +
 exp.toGMTString() +
 ";domain=360doc.com;";
}

設為首頁

function setHomepage() {
 if (document.all) {
 document.body.style.behavior = "url(#default#homepage)";
 document.body.setHomePage("http://w3cboy.com");
 } else if (window.sidebar) {
 if (window.netscape) {
  try {
  netscape.security.PrivilegeManager.enablePrivilege(
   "UniversalXPConnect"
  );
  } catch (e) {
  alert(
   "該操作被瀏覽器拒絕,如果想啟用該功能,請在位址列內輸入 about:config,然後將項 signed.applets.codebase_principal_support 值該為true"
  );
  }
 }
 var prefs = Components.classes[
  "@mozilla.org/preferences-service;1"
 ].getService(Components.interfaces.nsIPrefBranch);
 prefs.setCharPref("browser.startup.homepage","http://w3cboy.com");
 }
}

按字母排序,對每行進行陣列排序

function setSort() {
 var text = K1.value
 .split(/[\r\n]/)
 .sort()
 .join("\r\n"); //順序
 var test = K1.value
 .split(/[\r\n]/)
 .sort()
 .reverse()
 .join("\r\n"); //反序
 K1.value = K1.value != text ? text : test;
}

延時執行

// 比如 sleep(1000) 意味著等待1000毫秒,還可從 Promise、Generator、Async/Await 等角度實現。
// Promise
const sleep = time => {
 return new Promise(resolve => setTimeout(resolve,time));
};

sleep(1000).then(() => {
 console.log(1);
});


// Generator
function* sleepGenerator(time) {
 yield new Promise(function(resolve,reject) {
 setTimeout(resolve,time);
 });
}

sleepGenerator(1000)
 .next()
 .value.then(() => {
 console.log(1);
 });

//async
function sleep(time) {
 return new Promise(resolve => setTimeout(resolve,time));
}

async function output() {
 let out = await sleep(1000);
 console.log(1);
 return out;
}

output();

function sleep(callback,time) {
 if (typeof callback === "function") {
 setTimeout(callback,time);
 }
}

function output() {
 console.log(1);
}

sleep(output,1000);

判斷是否以某個字串開頭

String.prototype.startWith = function(s) {
 return this.indexOf(s) == 0;
};

清除指令碼內容

function stripscript(s) {
 return s.replace(/<script.*?>.*?<\/script>/gi,"");
}

時間個性化輸出功能

/*
1、< 60s,顯示為“剛剛”
2、>= 1min && < 60 min,顯示與當前時間差“XX分鐘前”
3、>= 60min && < 1day,顯示與當前時間差“今天 XX:XX”
4、>= 1day && < 1year,顯示日期“XX月XX日 XX:XX”
5、>= 1year,顯示具體日期“XXXX年XX月XX日 XX:XX”
*/
function timeFormat(time) {
 var date = new Date(time),curDate = new Date(),year = date.getFullYear(),month = date.getMonth() + 10,day = date.getDate(),hour = date.getHours(),minute = date.getMinutes(),curYear = curDate.getFullYear(),curHour = curDate.getHours(),timeStr;

 if (year < curYear) {
 timeStr = year + "年" + month + "月" + day + "日 " + hour + ":" + minute;
 } else {
 var pastTime = curDate - date,pastH = pastTime / 3600000;

 if (pastH > curHour) {
  timeStr = month + "月" + day + "日 " + hour + ":" + minute;
 } else if (pastH >= 1) {
  timeStr = "今天 " + hour + ":" + minute + "分";
 } else {
  var pastM = curDate.getMinutes() - minute;
  if (pastM > 1) {
  timeStr = pastM + "分鐘前";
  } else {
  timeStr = "剛剛";
  }
 }
 }
 return timeStr;
}

全形轉換為半形函式

function toCDB(str) {
 var result = "";
 for (var i = 0; i < str.length; i++) {
 code = str.charCodeAt(i);
 if (code >= 65281 && code <= 65374) {
  result += String.fromCharCode(str.charCodeAt(i) - 65248);
 } else if (code == 12288) {
  result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);
 } else {
  result += str.charAt(i);
 }
 }
 return result;
}

半形轉換為全形函式

function toDBC(str) {
 var result = "";
 for (var i = 0; i < str.length; i++) {
 code = str.charCodeAt(i);
 if (code >= 33 && code <= 126) {
  result += String.fromCharCode(str.charCodeAt(i) + 65248);
 } else if (code == 32) {
  result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);
 } else {
  result += str.charAt(i);
 }
 }
 return result;
}

金額大寫轉換函式

function transform(tranvalue) {
 try {
 var i = 1;
 var dw2 = new Array("","萬","億"); //大單位
 var dw1 = new Array("拾","佰","仟"); //小單位
 var dw = new Array(
  "零","壹","貳","叄","肆","伍","陸","柒","捌","玖"
 ); 
 //整數部分用
 //以下是小寫轉換成大寫顯示在合計大寫的文字框中
 //分離整數與小數
 var source = splits(tranvalue);
 var num = source[0];
 var dig = source[1];
 //轉換整數部分
 var k1 = 0; //計小單位
 var k2 = 0; //計大單位
 var sum = 0;
 var str = "";
 var len = source[0].length; //整數的長度
 for (i = 1; i <= len; i++) {
  var n = source[0].charAt(len - i); //取得某個位數上的數字
  var bn = 0;
  if (len - i - 1 >= 0) {
  bn = source[0].charAt(len - i - 1); //取得某個位數前一位上的數字
  }
  sum = sum + Number(n);
  if (sum != 0) {
  str = dw[Number(n)].concat(str); //取得該數字對應的大寫數字,並插入到str字串的前面
  if (n == "0") sum = 0;
  }
  if (len - i - 1 >= 0) {
  //在數字範圍內
  if (k1 != 3) {
   //加小單位
   if (bn != 0) {
   str = dw1[k1].concat(str);
   }
   k1++;
  } else {
   //不加小單位,加大單位
   k1 = 0;
   var temp = str.charAt(0);
   if (temp == "萬" || temp == "億")
   //若大單位前沒有數字則捨去大單位
   str = str.substr(1,str.length - 1);
   str = dw2[k2].concat(str);
   sum = 0;
  }
  }
  if (k1 == 3) {
  //小單位到千則大單位進一
  k2++;
  }
 }
 //轉換小數部分
 var strdig = "";
 if (dig != "") {
  var n = dig.charAt(0);
  if (n != 0) {
  strdig += dw[Number(n)] + "角"; //加數字
  }
  var n = dig.charAt(1);
  if (n != 0) {
  strdig += dw[Number(n)] + "分"; //加數字
  }
 }
 str += "元" + strdig;
 } catch (e) {
 return "0元";
 }
 return str;
}
//拆分整數與小數
function splits(tranvalue) {
 var value = new Array("","");
 temp = tranvalue.split(".");
 for (var i = 0; i < temp.length; i++) {
 value = temp;
 }
 return value;
}

清除空格

String.prototype.trim = function() {
 var reExtraSpace = /^\s*(.*?)\s+$/;
 return this.replace(reExtraSpace,"$1");
};

// 清除左空格
function ltrim(s) {
 return s.replace(/^(\s*| *)/,"");
}

// 清除右空格
function rtrim(s) {
 return s.replace(/(\s*| *)$/,"");
}

隨機數時間戳

function uniqueId() {
 var a = Math.random,b = parseInt;
 return (
 Number(new Date()).toString() + b(10 * a()) + b(10 * a()) + b(10 * a())
 );
}

實現utf8解碼

function utf8_decode(str_data) {
 var tmp_arr = [],c1 = 0,c2 = 0,c3 = 0;
 str_data += "";
 while (i < str_data.length) {
 c1 = str_data.charCodeAt(i);
 if (c1 < 128) {
  tmp_arr[ac++] = String.fromCharCode(c1);
  i++;
 } else if (c1 > 191 && c1 < 224) {
  c2 = str_data.charCodeAt(i + 1);
  tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
  i += 2;
 } else {
  c2 = str_data.charCodeAt(i + 1);
  c3 = str_data.charCodeAt(i + 2);
  tmp_arr[ac++] = String.fromCharCode(
  ((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)
  );
  i += 3;
 }
 }
 return tmp_arr.join("");
}

以下是Puxiao投稿推薦的幾個函式,用作常見的輸入值校驗和替換操作,主要針對中國大陸地區的校驗規則:

校驗是否為一個數字,以及該數字小數點位數是否與引數floats一致

校驗規則:

  • 若引數floats有值,則校驗該數字小數點後的位數。
  • 若引數floats沒有值,則僅僅校驗是否為數字。
function isNum(value,floats=null){
 let regexp = new RegExp(`^[1-9][0-9]*.[0-9]{${floats}}$|^0.[0-9]{${floats}}$`);
 return typeof value === 'number' && floats?regexp.test(String(value)):true;
}
function anysicIntLength(minLength,maxLength){
 let result_str = '';
 if(minLength){
  switch(maxLength){
   case undefined:
    result_str = result_str.concat(`{${minLength-1}}`);
    break;
   case null:
    result_str = result_str.concat(`{${minLength-1},}`);
    break;
   default:
    result_str = result_str.concat(`{${minLength-1},${maxLength-1}}`);
  }
 }else{
  result_str = result_str.concat('*');
 }

 return result_str;
}

校驗是否為非零的正整數

function isInt(value,minLength=null,maxLength=undefined){
 if(!isNum(value)) return false;

 let regexp = new RegExp(`^-?[1-9][0-9]${anysicIntLength(minLength,maxLength)}$`);
 return regexp.test(value.toString());
}

校驗是否為非零的正整數

function isPInt(value,maxLength=undefined) {
 if(!isNum(value)) return false;

 let regexp = new RegExp(`^[1-9][0-9]${anysicIntLength(minLength,maxLength)}$`);
 return regexp.test(value.toString());
}

校驗是否為非零的負整數

function isNInt(value,maxLength=undefined){
 if(!isNum(value)) return false;
 let regexp = new RegExp(`^-[1-9][0-9]${anysicIntLength(minLength,maxLength)}$`);
 return regexp.test(value.toString());
}

校驗整數是否在取值範圍內

校驗規則:

  • minInt為在取值範圍中最小的整數
  • maxInt為在取值範圍中最大的整數
function checkIntRange(value,minInt,maxInt=9007199254740991){
 return Boolean(isInt(value) && (Boolean(minInt!=undefined && minInt!=null)?value>=minInt:true) && (value<=maxInt));
}

校驗是否為中國大陸手機號

function isTel(value) {
 return /^1[3,4,5,6,7,8,9][0-9]{9}$/.test(value.toString());
}

校驗是否為中國大陸傳真或固定電話號碼

function isFax(str) {
 return /^([0-9]{3,4})?[0-9]{7,8}$|^([0-9]{3,4}-)?[0-9]{7,8}$/.test(str);
}

校驗是否為郵箱地址

function isEmail(str) {
 return /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/.test(str);
}

校驗是否為QQ號碼

校驗規則:

  • 非0開頭的5位-13位整數
function isQQ(value) {
 return /^[1-9][0-9]{4,12}$/.test(value.toString());
}

校驗是否為網址

校驗規則:

  • 以https://、http://、ftp://、rtsp://、mms://開頭、或者沒有這些開頭
  • 可以沒有www開頭(或其他二級域名),僅域名
  • 網頁地址中允許出現/%*?@&等其他允許的符號
function isURL(str) {
 return /^(https:\/\/|http:\/\/|ftp:\/\/|rtsp:\/\/|mms:\/\/)?[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$/.test(str);
}

校驗是否為不含埠號的IP地址

校驗規則:

  • IP格式為xxx.xxx.xxx.xxx,每一項數字取值範圍為0-255
  • 除0以外其他數字不能以0開頭,比如02
function isIP(str) {
 return /^((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])$/.test(str);
}

校驗是否為IPv6地址

校驗規則:

  • 支援IPv6正常格式
  • 支援IPv6壓縮格式
function isIPv6(str){
 return Boolean(str.match(/:/g)?str.match(/:/g).length<=7:false && /::/.test(str)?/^([\da-f]{1,4}(:|::)){1,6}[\da-f]{1,4}$/i.test(str):/^([\da-f]{1,4}:){7}[\da-f]{1,4}$/i.test(str));
}

校驗是否為中國大陸第二代居民身份證

校驗規則:

  • 共18位,最後一位可為X(大小寫均可)
  • 不能以0開頭
  • 出生年月日會進行校驗:年份只能為18/19/2*開頭,月份只能為01-12,日只能為01-31
function isIDCard(str){
 return /^[1-9][0-9]{5}(18|19|(2[0-9]))[0-9]{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)[0-9]{3}[0-9Xx]$/.test(str);
}

校驗是否為中國大陸郵政編碼

引數value為數字或字串

校驗規則:

  • 共6位,且不能以0開頭
function isPostCode(value){
 return /^[1-9][0-9]{5}$/.test(value.toString());
}

校驗兩個引數是否完全相同,包括型別

校驗規則:

  • 值相同,資料型別也相同
function same(firstValue,secondValue){
 return firstValue===secondValue;
}

校驗字元的長度是否在規定的範圍內

校驗規則:

  • minInt為在取值範圍中最小的長度
  • maxInt為在取值範圍中最大的長度
function lengthRange(str,minLength,maxLength=9007199254740991) {
 return Boolean(str.length >= minLength && str.length <= maxLength);
}

校驗字元是否以字母開頭

校驗規則:

  • 必須以字母開頭
  • 開頭的字母不區分大小寫
function letterBegin(str){
 return /^[A-z]/.test(str);
}

校驗字元是否為純數字(整數)

校驗規則:

  • 字元全部為正整數(包含0)
  • 可以以0開頭
function pureNum(str) {
 return /^[0-9]*$/.test(str);
}
function anysicPunctuation(str){
 if(!str) return null;
 let arr = str.split('').map(item => {
  return item = '\\' + item;
 });
 return arr.join('|');
}
function getPunctuation(str){
 return anysicPunctuation(str) || '\\~|\\`|\\!|\\@|\\#|\\$|\\%|\\^|\\&|\\*|\\(|\\)|\\-|\\_|\\+|\\=|\\||\\\|\\[|\\]|\\{|\\}|\\;|\\:|\\"|\\\'|\\,|\\<|\\.|\\>|\\/|\\?';
}
function getExcludePunctuation(str){
 let regexp = new RegExp(`[${anysicPunctuation(str)}]`,'g');
 return getPunctuation(' ~`!@#$%^&*()-_+=\[]{};:"\',<.>/?'.replace(regexp,''));
}

返回字串構成種類(字母,數字,標點符號)的數量

LIP縮寫的由來:L(letter 字母) + I(uint 數字) + P(punctuation 標點符號)

引數punctuation的說明:

  • punctuation指可接受的標點符號集
  • 若需自定義符號集,例如“僅包含中劃線和下劃線”,將引數設定為"-_"即可
  • 若不傳值或預設為null,則內部預設標點符號集為除空格外的其他英文標點符號:~`!@#$%^&*()-_+=[]{};:"',<.>/?
function getLIPTypes(str,punctuation=null){
 let p_regexp = new RegExp('['+getPunctuation(punctuation)+']');
 return /[A-z]/.test(str) + /[0-9]/.test(str) + p_regexp.test(str);
}

校驗字串構成的種類數量是否大於或等於引數num的值。 通常用來校驗使用者設定的密碼複雜程度。

校驗規則:

  • 引數num為需要構成的種類(字母、數字、標點符號),該值只能是1-3。
  • 預設引數num的值為1,即表示:至少包含字母,數字,標點符號中的1種
  • 若引數num的值為2,即表示:至少包含字母,數字,標點符號中的2種
  • 若引數num的值為3,即表示:必須同時包含字母,數字,標點符號
  • 引數punctuation指可接受的標點符號集,具體設定可參考getLIPTypes()方法中關於標點符號集的解釋。
function pureLIP(str,num=1,punctuation=null){
 let regexp = new RegExp(`[^A-z0-9|${getPunctuation(punctuation)}]`);
 return Boolean(!regexp.test(str) && getLIPTypes(str,punctuation)>= num);
}

清除所有空格

function clearSpaces(str){
 return str.replace(/[ ]/g,'');
}

清除所有中文字元(包括中文標點符號)

function clearCNChars(str){
 return str.replace(/[\u4e00-\u9fa5]/g,'');
}

清除所有中文字元及空格

function clearCNCharsAndSpaces(str){
 return str.replace(/[\u4e00-\u9fa5 ]/g,'');
}

除保留標點符號集以外,清除其他所有英文的標點符號(含空格)

全部英文標點符號為: ~`!@#$%^&*()-_+=[]{};:"',<.>/?

引數excludePunctuation指需要保留的標點符號集,例如若傳遞的值為'_',即表示清除_以外的其他所有英文標點符號。

function clearPunctuation(str,excludePunctuation=null){
 let regexp = new RegExp(`[${getExcludePunctuation(excludePunctuation)}]`,'g');
 return str.replace(regexp,'');
}

校驗是否包含空格

function haveSpace(str) {
 return /[ ]/.test(str);
}

校驗是否包含中文字元(包括中文標點符號)

function haveCNChars(str){
 return /[\u4e00-\u9fa5]/.test(str);
}

感興趣的朋友可以使用線上HTML/CSS/JavaScript程式碼執行工具:http://tools.jb51.net/code/HtmlJsRun測試上述程式碼執行效果。

更多關於JavaScript相關內容可檢視本站專題:《JavaScript常用函式技巧彙總》、《javascript面向物件入門教程》、《JavaScript錯誤與除錯技巧總結》、《JavaScript資料結構與演算法技巧總結》及《JavaScript數學運算用法總結》

希望本文所述對大家JavaScript程式設計有所幫助。