js中的string.format函式程式碼
<1>
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String.prototype.format = function(args) {
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var result = this;
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if (arguments.length > 0) {
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if (arguments.length == 1 && typeof (args) == "object") {
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for (var key in args) {
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if(args[key]!=undefined){
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var reg = new RegExp("({" + key + "})", "g");
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result = result.replace(reg, args[key]);
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}
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}
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}
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else {
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for (var i = 0; i < arguments.length; i++) {
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if (arguments[i] != undefined) {
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//var reg = new RegExp("({[" + i + "]})", "g");//這個在索引大於9時會有問題
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var reg = new RegExp("({)" + i + "(})", "g");
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result = result.replace(reg, arguments[i]);
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}
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}
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}
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}
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return result;
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}
呼叫方式:
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//兩種呼叫方式
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var template1="我是{0},今年{1}了";
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var template2="我是{name},今年{age}了";
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var result1=template1.format("loogn",22);
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var result2=template2.format({name:"loogn",age:22});
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//兩個結果都是"我是loogn,今年22了"
方案2:方法呼叫
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function stringFormat() {
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if (arguments.length == 0)
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return null;
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var str = arguments[0];
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for (var i = 1; i < arguments.length; i++) {
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var re = new RegExp('\\{' + (i - 1) + '\\}', 'gm');
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str = str.replace(re, arguments[i]);
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}
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return str;
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}
呼叫方式:
StringFormat("&Type={0}&Ro={1}&lPlan={2}&Plan={3}&={4}&Id={5}&Id={6}", data1, data2, data3,data4, data5,data6,data7);
方案3:
相信做前端開發的朋友都受過這個折磨:連線HTML的時候被可惡的單引號、雙引號搞得頭昏腦脹。比如:
element.innerHTML = ‘<a href=”‘ + url + ‘” onclick=”alert(\” + msg + ‘\’);”>’ + text + ‘</a>’;
這裡介紹一個字串格式化函式:
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String.format = function(str) {
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var args = arguments, re = new RegExp(”%([1-" + args.length + "])”, “g”);
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return String(str).replace(
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re,
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function($1, $2) {
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return args[$2];
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}
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);
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};
呼叫方式:
element.innerHTML = String.format(’<a href=”%1″ onclick=”alert(\’%2\’);”>%3</a>’, url, msg, text);
<3>
String.prototype.format = function() { var args = arguments; return this.replace(/\{(\d+)\}/g, function(m, i){ return args[i]; }); }
//V2 static String.format = function() { if( arguments.length == 0 ) return null; var str = arguments[0];
for(var i=1;i<arguments.length;i++) { var re = new RegExp('\\{' + (i-1) + '\\}','gm');
str = str.replace(re, arguments[i]); } return str; }
var a = "I Love {0}, and You Love {1},Where are {0}! {4}";
alert(String.format(a, "You","Me"));
alert(a.format("You","Me"));
<2>
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//兩種呼叫方式
var template1="我是{0},今年{1}了";
var template2="我是{name},今年{age}了";
var result1=template1.format("loogn",22);
var result2=template1.format({name:"loogn",age:22});
//兩個結果都是"我是loogn,今年22了"
<3>