Relatively streamlined Javascript drag effect function code_javascript skills

<title>Drag effect function demonstration by Longbill.cn</title> <style> body { font-size:12px; color:#333333; border : 0px solid blue; } div { position : absolute; background-color : #c3d9ff; margin : 0px; padding : 5px; border : 0px; width : 100px; height:100px; } </style> <div id="div1" style="left:10px;top:10px;"> </div>div1: I can be dragged <div id="div2" style="left:120px;top:10px;background-color : #f3d9ff"> </div>div2: Come and drag me<div id="div3" style="left:230px;top:10px;background-color : #c3ffff"> </div>div3: I can drag it as you wish<div id="div4" style="left:10px;top:120px;background-color : #c3d944"> </div>div4: I can slide with the window, drag me to the bottom, and then scroll the web page to see <div id="div5" style="left:120px;top:120px;background-color : #f3d944"> <a href="http://www.longbill.cn" target="_blank">Author: Longbill </a>www.longbill.cn</div> <div id="div6" style="left:230px;top:120px;background-color : #e3f944;width:200px;"> </div>Parameter description: drag(obj [,scroll]); obj: the id of the object or the object itself; scroll (optional): Whether the object slides as the window is dragged, the default is no Right click to view source code
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If you need to introduce external Js, you need to refresh to execute ]<script> function drag(o,s) { if (typeof o == "string") o = document.getElementById(o); o.orig_x = parseInt(o.style.left) - document.body.scrollLeft; o.orig_y = parseInt(o.style.top) - document.body.scrollTop; o.orig_index = o.style.zIndex; o.onmousedown = function(a) { this.style.cursor = "move"; this.style.zIndex = 10000; var d=document; if(!a)a=window.event; var x = a.clientX+d.body.scrollLeft-o.offsetLeft; var y = a.clientY+d.body.scrollTop-o.offsetTop; //author: www.longbill.cn d.ondragstart = "return false;" d.onselectstart = "return false;" d.onselect = "document.selection.empty();" if(o.setCapture) o.setCapture(); else if(window.captureEvents) window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP); d.onmousemove = function(a) { if(!a)a=window.event; o.style.left = a.clientX+document.body.scrollLeft-x; o.style.top = a.clientY+document.body.scrollTop-y; o.orig_x = parseInt(o.style.left) - document.body.scrollLeft; o.orig_y = parseInt(o.style.top) - document.body.scrollTop; } d.onmouseup = function() { if(o.releaseCapture) o.releaseCapture(); else if(window.captureEvents) window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP); d.onmousemove = null; d.onmouseup = null; d.ondragstart = null; d.onselectstart = null; d.onselect = null; o.style.cursor = "normal"; o.style.zIndex = o.orig_index; } } if (s) { var orig_scroll = window.onscroll?window.onscroll:function (){}; window.onscroll = function () { orig_scroll(); o.style.left = o.orig_x + document.body.scrollLeft; o.style.top = o.orig_y + document.body.scrollTop; } } } </script><script> drag("div1"); drag("div2"); drag("div3"); drag("div4",1); drag("div5",1); drag("div6",1); </script>