js实现拖拽功能

时间:2020-05-15 13751343826 人气:0

效果图：(红色方块可任意拖动)

代码如下：

 <meta charset="UTF-8">
 <meta name="Generator" content="EditPlus®">
 <meta name="Author" content="">
 <meta name="Keywords" content="">
 <meta name="Description" content="">
 <title>Document</title>
 <style type="text/css">
 *{
 margin:0;
 padding:0;
 }
 body{
 background:url("img/2345_image_file_copy_1.jpg");
 }
 #d1{
 width:100px;
 height:100px;
 background:red;
 margin-left:300px;
 }
 </style>
 </head>
 <body>
 <div id="d1"></div>
 </body>
 <script>
 window.onload=function(){
 var d1=document.getElementById("d1");
 d1.onmousedown=function(e){
 var mouseX=e.clientX;
 var mouseY=e.clientY;//计算xy
 var pianyiX=mouseX-d1.offsetLeft;
 var pianyiY=mouseY-d1.offsetTop;
 document.onmousemove=function(e){
 var newX=e.clientX-pianyiX;
 var newY=e.clientY-pianyiY;
 d1.style.marginLeft=newX+"px";
 d1.style.marginTop=newY+"px";
 }
 };
 document.onmouseup = function(e){
 document.onmousemove = null ;
 };
 }
 /*
 结果，上面的onmousemove要写在document上,我写在div上导致错误
 */
 </script>
</html>

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