效果圖：

直接上程式碼

<script>
 window.onload = function() {
  var oUl = document.getElementById("ul1");
  var aLi = oUl.getElementsByTagName("li");
  var disX = 0;
  var disY = 0;
  var minZindex = 1;
  var aPos = [];
  for (var i = 0; i < aLi.length; i++) {
   var t = aLi[i].offsetTop;
   var l = aLi[i].offsetLeft;
   aLi[i].style.top = t + "px";
   aLi[i].style.left = l + "px";
   aPos[i] = {
    left: l,top: t
   };
   aLi[i].index = i;
  }
  for (var i = 0; i < aLi.length; i++) {
   aLi[i].style.position = "absolute";
   aLi[i].style.margin = 0;
   setDrag(aLi[i]);
  }
  //拖拽
  function setDrag(obj) {
   obj.onmouseover = function() {
    obj.style.cursor = "move";
   }
   obj.onmousedown = function(event) {
    var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
    var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
    obj.style.zIndex = minZindex++;
    //當滑鼠按下時計算滑鼠與拖拽物件的距離
    disX = event.clientX + scrollLeft - obj.offsetLeft;
    disY = event.clientY + scrollTop - obj.offsetTop;
    document.onmousemove = function(event) {
     //當滑鼠拖動時計算div的位置
     var l = event.clientX - disX + scrollLeft;
     var t = event.clientY - disY + scrollTop;
     obj.style.left = l + "px";
     obj.style.top = t + "px";
     /*for(var i=0;i<aLi.length;i++){
     	aLi[i].className = "";
     	if(obj==aLi[i])continue;//如果是自己則跳過自己不加紅色虛線
     	if(colTest(obj,aLi[i])){
     		aLi[i].className = "active";
     	}
     }*/
     for (var i = 0; i < aLi.length; i++) {
      aLi[i].className = "";
     }
     var oNear = findMin(obj);
     if (oNear) {
      oNear.className = "active";
     }
    }
    document.onmouseup = function() {
     document.onmousemove = null; //當滑鼠彈起時移出移動事件
     document.onmouseup = null; //移出up事件，清空記憶體
     //檢測是否普碰上，在交換位置
     var oNear = findMin(obj);
     if (oNear) {
      oNear.className = "";
      oNear.style.zIndex = minZindex++;
      obj.style.zIndex = minZindex++;
      startMove(oNear,aPos[obj.index]);
      startMove(obj,aPos[oNear.index]);
      //交換index
      oNear.index += obj.index;
      obj.index = oNear.index - obj.index;
      oNear.index = oNear.index - obj.index;
     } else {

      startMove(obj,aPos[obj.index]);
     }
    }
    clearInterval(obj.timer);
    return false; //低版本出現禁止符號
   }
  }
  //碰撞檢測
  function colTest(obj1,obj2) {
   var t1 = obj1.offsetTop;
   var r1 = obj1.offsetWidth + obj1.offsetLeft;
   var b1 = obj1.offsetHeight + obj1.offsetTop;
   var l1 = obj1.offsetLeft;

   var t2 = obj2.offsetTop;
   var r2 = obj2.offsetWidth + obj2.offsetLeft;
   var b2 = obj2.offsetHeight + obj2.offsetTop;
   var l2 = obj2.offsetLeft;

   if (t1 > b2 || r1 < l2 || b1 < t2 || l1 > r2) {
    return false;
   } else {
    return true;
   }
  }
  //勾股定理求距離
  function getDis(obj1,obj2) {
   var a = obj1.offsetLeft - obj2.offsetLeft;
   var b = obj1.offsetTop - obj2.offsetTop;
   return Math.sqrt(Math.pow(a,2) + Math.pow(b,2));
  }
  //找到距離最近的
  function findMin(obj) {
   var minDis = 999999999;
   var minIndex = -1;
   for (var i = 0; i < aLi.length; i++) {
    if (obj == aLi[i]) continue;
    if (colTest(obj,aLi[i])) {
     var dis = getDis(obj,aLi[i]);
     if (dis < minDis) {
      minDis = dis;
      minIndex = i;
     }
    }
   }
   if (minIndex == -1) {
    return null;
   } else {
    return aLi[minIndex];
   }
  }
 }
</script>

 

<ul id="ul1">
 <li><img src="https://www.jq22.com/img/cs/500x500-1.png" width="200" height="150 "></li>
  <li><img src="https://www.jq22.com/img/cs/500x500-2.png " width="200 " height="150 "></li>
  <li><img src="https://www.jq22.com/img/cs/500x500-3.png " width="200 " height="150 "></li>
  <li><img src="https://www.jq22.com/img/cs/500x500-4.png " width="200 " height="150 "></li>
  <li><img src="https://www.jq22.com/img/cs/500x500-5.png " width="200 " height="150 "></li>
  <li><img src="https://www.jq22.com/img/cs/500x500-6.png " width="200 " height="150 "></li>
 </ul>

* {
	margin:0;
	padding:0;
	list-style:none
}
#ul1 {
	width:660px;
	position:relative;
	margin:10px auto;
}
#ul1 li {
	width:200px;
	height:150px;
	float:left;
	list-style:none;
	margin:10px;
}
#ul1 li:hover {
	border-color:#9a9fa4;
	box-shadow:0 0 6px 0 rgba(0,0.85);
}
#ul1 .active {
	border:1px dashed red;
}

//通過class獲取元素
function getClass(cls) {
 var ret = [];
 var els = document.getElementsByTagName("*");
 for (var i = 0; i < els.length; i++) {
  //判斷els[i]中是否存在cls這個className;.indexOf("cls")判斷cls存在的下標，如果下標>=0則存在;
  if (els[i].className === cls || els[i].className.indexOf("cls") >= 0 || els[i].className.indexOf(" cls") >= 0 || els[i].className.indexOf(" cls ") > 0) {
   ret.push(els[i]);
  }
 }
 return ret;
}

function getStyle(obj,attr) { //解決JS相容問題獲取正確的屬性值
 return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj,false)[attr];
}

function startMove(obj,json,fun) {
 clearInterval(obj.timer);
 obj.timer = setInterval(function() {
  var isStop = true;
  for (var attr in json) {
   var iCur = 0;
   //判斷運動的是不是透明度值
   if (attr == "opacity") {
    iCur = parseInt(parseFloat(getStyle(obj,attr)) * 100);
   } else {
    iCur = parseInt(getStyle(obj,attr));
   }
   var ispeed = (json[attr] - iCur) / 8;
   //運動速度如果大於0則向下取整，如果小於0想上取整；
   ispeed = ispeed > 0 ? Math.ceil(ispeed) : Math.floor(ispeed);
   //判斷所有運動是否全部完成
   if (iCur != json[attr]) {
    isStop = false;
   }
   //運動開始
   if (attr == "opacity") {
    obj.style.filter = "alpha:(opacity:" + (json[attr] + ispeed) + ")";
    obj.style.opacity = (json[attr] + ispeed) / 100;
   } else {
    obj.style[attr] = iCur + ispeed + "px";
   }
  }
  //判斷是否全部完成
  if (isStop) {
   clearInterval(obj.timer);
   if (fun) {
    fun();
   }
  }
 },30);
}

總結

到此這篇基於js實現的圖片拖拽排序原始碼的文章就介紹到這了,更多相關js圖片拖拽排序內容請搜尋我們以前的文章或繼續瀏覽下面的相關文章希望大家以後多多支援我們！