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新建html文档。

书写html。

<div class="link"> <a href="javascript:showDialog();">登录</a> </div>

<div class="ui-mask" id="mask" onselectstart="return false"></div>

<div class="ui-dialog" id="dialogMove" onselectstart='return false;'>

 <div class="ui-dialog-title" id="dialogDrag"  onselectstart="return false;" > 登录通行证 <a class="ui-dialog-closebutton" href="javascript:hideDialog();"></a> </div>

 <div class="ui-dialog-content">

  <div class="ui-dialog-l40 ui-dialog-pt15">

   <input class="ui-dialog-input ui-dialog-input-username" type="input" placeholder="手机/邮箱/用户名" value="" />

  </div>

  <div class="ui-dialog-l40 ui-dialog-pt15">

   <input class="ui-dialog-input ui-dialog-input-password" type="input" placeholder="密码" value="" />

  </div>

  <div class="ui-dialog-l40"> <a href="#">忘记密码</a> </div>

  <div> <a class="ui-dialog-submit" href="#" >登录</a> </div>

  <div class="ui-dialog-l40"> <a href="#">立即注册</a> </div>

 </div>

</div>

书写css样式。

<style type="text/css">

body { background: url(images/baidu_demo.png) #fff top center no-repeat; padding: 0px; margin: 0px; font-size: 12px; font-family: "微软雅黑"; }

.link { text-align: right; line-height: 20px; padding-right: 40px; }

.ui-dialog { width: 380px; height: auto; display: none; position: absolute; z-index: 9000; top: 0px; left: 0px; border: 1px solid #D5D5D5; background: #fff; }

.ui-dialog a { text-decoration: none; }

.ui-dialog-title { height: 48px; line-height: 48px; padding: 0px 20px; color: #535353; font-size: 16px; border-bottom: 1px solid #efefef; background: #f5f5f5; cursor: move; user-select: none; }

.ui-dialog-closebutton { width: 16px; height: 16px; display: block; position: absolute; top: 12px; right: 20px; background: url(images/close_def.png) no-repeat; cursor: pointer; }

.ui-dialog-closebutton:hover { background: url(images/close_hov.png); }

.ui-dialog-content { padding: 15px 20px; }

.ui-dialog-pt15 { padding-top: 15px; }

.ui-dialog-l40 { height: 40px; line-height: 40px; text-align: right; }

.ui-dialog-input { width: 100%; height: 40px; margin: 0px; padding: 0px; border: 1px solid #d5d5d5; font-size: 16px; color: #c1c1c1; text-indent: 25px; outline: none; }

.ui-dialog-input-username { background: url(images/input_username.png) no-repeat 2px; }

.ui-dialog-input-password { background: url(images/input_password.png) no-repeat 2px; }

.ui-dialog-submit { width: 100%; height: 50px; background: #3b7ae3; border: none; font-size: 16px; color: #fff; outline: none; text-decoration: none; display: block; text-align: center; line-height: 50px; }

.ui-dialog-submit:hover { background: #3f81b0; }

.ui-mask { width: 100%; height: 100%; background: #000; position: absolute; top: 0px; height: 0px; z-index: 8000; opacity: 0.4; filter: Alpha(opacity=40); }

</style>

书写js特效。

<script type="text/javascript">

var dialogInstace , onMoveStartId , mousePos = {x:0,y:0};

function g(id){return document.getElementById(id);}

function autoCenter( el ){

var bodyW = document.documentElement.clientWidth;

var bodyH = document.documentElement.clientHeight;

var elW = el.offsetWidth;

var elH = el.offsetHeight;

el.style.left = (bodyW-elW)/2 + 'px';

el.style.top = (bodyH-elH)/2 + 'px';

}

function fillToBody( el ){

el.style.width  = document.documentElement.clientWidth  +'px';

el.style.height = document.documentElement.clientHeight + 'px';

}

function Dialog( dragId , moveId ){

var instace = {} ;

instace.dragElement  = g(dragId);

instace.moveElement  = g(moveId);

instace.mouseOffsetLeft = 0;

instace.mouseOffsetTop = 0;

instace.dragElement.addEventListener('mousedown',function(e){

var e = e || window.event;

dialogInstace = instace;

instace.mouseOffsetLeft = e.pageX - instace.moveElement.offsetLeft ;

instace.mouseOffsetTop  = e.pageY - instace.moveElement.offsetTop ;

onMoveStartId = setInterval(onMoveStart,10);

return false;

})

return instace;

}

document.onmouseup = function(e){

dialogInstace = false;

clearInterval(onMoveStartId);

}

document.onmousemove = function( e ){

var e = window.event || e;

mousePos.x = e.clientX;

mousePos.y = e.clientY;

e.stopPropagation && e.stopPropagation();

e.cancelBubble = true;

e = this.originalEvent;

        e && ( e.preventDefault ? e.preventDefault() : e.returnValue = false );

        document.body.style.MozUserSelect = 'none';

}

function onMoveStart(){

var instace = dialogInstace;

   if (instace) {   

    var maxX = document.documentElement.clientWidth -  instace.moveElement.offsetWidth;

    var maxY = document.documentElement.clientHeight - instace.moveElement.offsetHeight ;

instace.moveElement.style.left = Math.min( Math.max( ( mousePos.x - instace.mouseOffsetLeft) , 0 ) , maxX) + "px";

instace.moveElement.style.top  = Math.min( Math.max( ( mousePos.y - instace.mouseOffsetTop ) , 0 ) , maxY) + "px";

   }

}

function showDialog(){

g('dialogMove').style.display = 'block';

g('mask').style.display = 'block';

autoCenter( g('dialogMove') );

fillToBody( g('mask') );

}

function hideDialog(){

g('dialogMove').style.display = 'none';

g('mask').style.display = 'none';

}

window.onresize = showDialog;

Dialog('dialogDrag','dialogMove');

showDialog();

</script>

查看效果