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JS enables images to be dragged on web pages

php中世界最好的语言Original: 2018-04-18 11:35:202286browse

This time I will bring you the JS implementation of pictures being dragged on the web page. What are the precautions for JS implementation of the image being dragged on the web page? The following is a practical case, let's take a look.

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <style>
  #pbox{
   width: 100%;
   height:100%;
  }
  #box{
   width: 200px;
   height: 200px;
   background:red;
   position: absolute;
  }
 </style>
</head>
<body>
<input type="button" id="btn" value="随机生成">
<p id="pbox">
<p id="box">
</p>
</p>
</body>
<script>
 var btn=document.getElementById("btn");//获取按钮
 var box=document.getElementById("box");//获取box
 var pbox=document.getElementById("pbox");//获取pbox
 var arr=['#fff143','#ff7500','#a3d900','#eedeb0','#ae7000','#b35c44','#392f41','#ff461f','#44cef6','#edd1db','#003371'];//随机颜色
 //给btn注册点击事件ain
 btn.onclick=function(){
   pbox.innerHTML="";//清空pbo
  for(var i=0;i<=10;i++){
   var newTip =box.cloneNode(true);
   pbox.appendChild(newTip);
   var left=parseInt(Math.random()*(900-100+1) + 100);//随机生成左边距
   var top=parseInt(Math.random()*(500-100+1) + 100);//随机生成上边距
   var bg=Math.floor((Math.random()*arr.length));//生成数组随机数获得随机数组下标
   box.style.background=arr[bg];//设置颜色
   box.style.top=top+"px";//设置上边距
   box.style.left=left+"px";//设置左边距
  }
  var c=pbox.children;
  for(var i=0;i< c.length;i++){
   c[i].onmousedown=function (e) {
//     alert(this.offsetLeft);
    var spacex=e.pageX-this.offsetLeft;
    var spacey=e.pageY-this.offsetTop;
    this.onmousemove=function (e) {
     this.style.left=e.pageX-spacex+"px";
     this.style.top=e.pageY-spacey+"px";
    }
   };
   c[i].onmouseup=function () {
    this.onmousemove=null;
   }
  }
 }
</script>
</html>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

JS enables images to be dragged on web pages

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