妙味——带框的拖拽

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<style>
#div1{width: 100px;height: 100px;background: red;position: absolute;}
.box{border: 1px dashed black;position: absolute;}
</style>
<script>
window.onload=function(){
    var oDiv=document.getElementById('div1');

    oDiv.onmousedown=function(ev)
    {
        var oEvent=ev||event;
        var disX=oEvent.clientX-oDiv.offsetLeft;
        var disY=oEvent.clientY-oDiv.offsetTop;

        var oNewDiv=document.createElement('div');

        oNewDiv.className='box';
        oNewDiv.style.width=oDiv.offsetWidth-2+'px';    //这里因为边框有宽度所以减2
        oNewDiv.style.height=oDiv.offsetHeight-2+'px';
        oNewDiv.style.left=oDiv.offsetLeft+'px';
        oNewDiv.style.top=oDiv.offsetTop+'px';

        document.body.appendChild(oNewDiv);

        document.onmousemove=function(ev)
        {
            var oEvent=ev||event;

            oNewDiv.style.left=oEvent.clientX-disX+'px';
            oNewDiv.style.top=oEvent.clientY-disY+'px';
        };

        document.onmouseup=function()
        {
            document.onmousemove=null;
            document.onmouseup=null;

            oDiv.style.left=oNewDiv.style.left;
            oDiv.style.top=oNewDiv.style.top;
            document.body.removeChild(oNewDiv);
        };

    };
};
</script>
</head>
<body>
    <div id="div1"></div>
</body>
</html>

高否？富否？帅否？否？滚去学习！

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原文地址：https://www.cnblogs.com/baixc/p/3501154.html