基于js实现的图片拖拽排序源码实例

效果图：

直接上代码

<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++;
    //当鼠标按下时计算鼠标与拖拽对象的距离
    disX = event.clientX + scrollLeft - obj.offsetLeft;
    disY = event.clientY + scrollTop - obj.offsetTop;
    document.onmousemove = function(event) {
     //当鼠标拖动时计算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;//如果是自己则跳过自己不加红色虚线
     	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; //当鼠标弹起时移出移动事件
     document.onmouseup = null; //移出up事件，清空内存
     //检测是否普碰上，在交换位置
     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]);
      //交换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; //低版本出现禁止符号
   }
  }
  //碰撞检测
  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;
   }
  }
  //勾股定理求距离
  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));
  }
  //找到距离最近的
  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(0,0,0,0.85);
}
#ul1 .active {
	border:1px dashed red;
}

//通过class获取元素
function getClass(cls) {
 var ret = [];
 var els = document.getElementsByTagName("*");
 for (var i = 0; i < els.length; i++) {
  //判断els[i]中是否存在cls这个className;.indexOf("cls")判断cls存在的下标，如果下标>=0则存在;
  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) { //解决JS兼容问题获取正确的属性值
 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;
   //判断运动的是不是透明度值
   if (attr == "opacity") {
    iCur = parseInt(parseFloat(getStyle(obj, attr)) * 100);
   } else {
    iCur = parseInt(getStyle(obj, attr));
   }
   var ispeed = (json[attr] - iCur) / 8;
   //运动速度如果大于0则向下取整，如果小于0想上取整；
   ispeed = ispeed > 0 ? Math.ceil(ispeed) : Math.floor(ispeed);
   //判断所有运动是否全部完成
   if (iCur != json[attr]) {
    isStop = false;
   }
   //运动开始
   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";
   }
  }
  //判断是否全部完成
  if (isStop) {
   clearInterval(obj.timer);
   if (fun) {
    fun();
   }
  }
 }, 30);
}

总结

到此这篇基于js实现的图片拖拽排序源码的文章就介绍到这了,更多相关js图片拖拽排序内容请搜索呐喊教程以前的文章或继续浏览下面的相关文章希望大家以后多多支持呐喊教程！

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