JavaScript登陸彈窗,可拖拽

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<!doctype html><html><head><meta charset="utf-8"><title>JavaScript登陸彈窗,可拖拽</title><style type="text/css">* { margin:0; padding:0; }#box { width:400px; height:200px; background:#f9f9f9; border:1px solid #ccc; position:absolute; left:50%; top:50%; margin:-100px 0 0 -200px; border-radius:4px; box-shadow:0 0 15px #ddd; }.title { padding:10px 20px; background-color:#f1f1f1; border-bottom:1px solid #ddd; font-size:14px; color:#333; }.login { padding:30px 0 0 50px; }.login p { margin-bottom:10px; font-size:14px; }.login input.text { width:200px; padding:5px; border:1px solid #ddd; vertical-align:middle; }.login input.btn { width:70px; padding:6px; border:1px solid #ddd; margin-left:41px; cursor:pointer; }</style></head><body><div id="box">    <h2 class="title">使用者登入</h2>    <div class="login">    <form action="">        <p><label>賬戶:</label><input type="text" name="" id="" class="text"></p>        <p><label>密碼:</label><input type="text" name="" id="" class="text"></p>        <p><input type="submit" name="" id="" value="提 交" class="btn"></p>    </form>    </div></div><script type="text/javascript">window.onload = function(){    var oBox = document.getElementById("box");    var oBtn = oBox.getElementsByTagName("h2")[0];    var disX = 0;    var disY = 0;    oBtn.onmousedown = function(ev){        var oEvent = ev||event;        disX = oEvent.clientX-oBox.offsetLeft;        disY = oEvent.clientY-oBox.offsetTop;        oBox.style.cursor = "crosshair";        document.onmousemove = function(ev){            var oEvent = ev||event;            var l = oEvent.clientX-disX;            var t = oEvent.clientY-disY;            oBox.style.margin = 0;            if(l<0){                l=0;            }else if(l>document.documentElement.clientWidth-oBox.offsetWidth){                l=document.documentElement.clientWidth-oBox.offsetWidth;            }            if(t<0){                t=0;            }else if(t>document.documentElement.clientHeight-oBox.offsetHeight){                t=document.documentElement.clientHeight-oBox.offsetHeight;            }            oBox.style.left = l+"px";            oBox.style.top = t+"px";        }        document.onmouseup = function(){            document.onmousemove = null;            document.onmouseup = null;            oBox.style.cursor = "default";        }        return false;    }    window.onresize = function(){        if(oBox.offsetLeft>document.documentElement.clientWidth-oBox.offsetWidth){            oBox.style.left=document.documentElement.clientWidth-oBox.offsetWidth+"px";        }        if(oBox.offsetTop>document.documentElement.clientHeight-oBox.offsetHeight){            oBox.style.top=document.documentElement.clientHeight-oBox.offsetHeight+"px";        }    }}</script></body></html>

 

 

 

 

 

 

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