js 鼠标拖拽效果实现

效果：
源码：
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>速表拖拽效果实现</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .toolbar{
            height: 30px;
            text-align: left;
            padding-left: 20px;
            background: #036663;
            line-height: 30px;
            color: #fff;
        }
        .regist{
            width: 410px;
            height: 310px;
            margin: 200px auto;
            border:5px solid #eee;
            box-shadow:2px 2px 2px 2px #666;

        }
        .rt{
            height: 26px;
            background: #7C9299;
            color: #fff;
            line-height: 26px;
            cursor: move;
        }
        .rts{
            float: right;
        }
    </style>
</head>
<body>
<div class="toolbar">注册信息</div>
<div class="regist" id="regist">
    <div class="rt" id="rt">
        <span>注册信息(可以拖拽)</span>
        <span class="rts">【关闭】</span>
    </div>
</div>
<script>
    var regist = document.getElementById("regist");
    var rt = document.getElementById("rt");
    var x = 0,y = 0;
    rt.onmousedown = function(event){
        var event = event || window.event;
        x = event.clientX -  regist.offsetLeft;
        y = event.clientY - regist.offsetTop + 30;//加三十是因为顶部工具条占了30，而regist的没有父亲，所以他是以body为定位点，所以。。。
        document.onmousemove = function(event){
            var event = event || window.event;
            regist.style.marginLeft = event.clientX - x +"px";
            regist.style.marginTop = event.clientY - y +"px";
            window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
        }
        document.onmouseup = function(){
            document.onmousemove = null;
        }
    }
</script>
</body>
</html>
js 鼠标拖拽效果实现

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