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JS implements super simple mouse dragging effect_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:34:181220browse

The example in this article describes how to implement a super simple mouse drag effect with JS. Share it with everyone for your reference, the details are as follows:

Here, use the shortest possible JavaScript code to write a JS drag. The function itself is 287 characters. . . If compatibility and variable encapsulation are not considered, it can be shorter.

The screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/js/2015/js-s-drug-demo/

The specific code is as follows: 

<title>尽可能短的写一个JS拖动</title>
<body>
<div id="demo" style="width:100px; height:100px; position:absolute; background-color:silver;"></div>
<script>
function dragable(id){var d=document,o=d.getElementById(id),s=o.style,x,y,p='onmousemove';o.onmousedown=function(e){e=e||event;x=e.clientX-o.offsetLeft;y=e.clientY-o.offsetTop;d[p]=function(e){e=e||event;s.left=e.clientX-x+'px';s.top=e.clientY-y+'px'};d.onmouseup=function(){d[p]=null}}}
dragable("demo");
</script>

I hope this article will be helpful to everyone in JavaScript programming.

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