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JS實現拖拽小案例

res pan urb posit htm eight || move use

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>簡單的拖拽</title>
    <link rel="stylesheet" href="../toolkit/reset.min.css">
    <style>
        #box{
            height: 200px;
            width: 200px;
            background-color
: #e277ff; position: absolute; cursor: move; } </style> </head> <body> <div id="box"></div> <script> var box=document.getElementById("box"); function drag(e) { e=e||window.event; var _this=this; var mouseX
=e.clientX, mouseY=e.clientY, boxL=this.offsetLeft, boxT=this.offsetTop; document.onmousemove=function (e) { e=e||window.event; var curMouseX=e.clientX, curMouseY=e.clientY, curBoxL
=curMouseX-mouseX+boxL, curBoxT=curMouseY-mouseY+boxT; var minW=0,maxW=((document.documentElement.clientWidth||document.body.clientWidth)-_this.offsetWidth); var minH=0,maxH=((document.documentElement.clientHeight||document.body.clientHeight)-_this.offsetHeight); if(curBoxL<=minW){ curBoxL=minW; }else if(curBoxL>=maxW){ curBoxL=maxW } if(curBoxT<=minH){ curBoxT=minH; }else if(curBoxT>=maxH){ curBoxT=maxH; } _this.style.left=curBoxL+"px"; _this.style.top=curBoxT+"px"; }; document.onmouseup=function () { document.onmousemove=null; } } box.onmousedown=drag; </script> </body> </html>

JS實現拖拽小案例