<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<STYLE>
  #login{
   position: relative;
   display: none;
     top: 20px;
     left: 30px;
     background-color: #ffffff;
     text-align: center;
     border: solid 1px;
     padding: 10px;
     z-index: 1;
  }
body {
background-color: #0099CC;
}
.STYLE1 {color: #FFFF00}
</STYLE>
<script type="text/javascript">
var W = screen.width;//取得屏幕分辨率寬度
var H = screen.height;//取得屏幕分辨率高度
function M(id){
  return document.getElementById(id);//用M()方法代替document.getElementByIdx_x(id)
}
function MC(t){
  return document.createElement(t);//用MC()方法代替document.createElement_x(t)
};
//判斷瀏覽器是否為IE
function isIE(){
   return (document.all && window.ActiveXObject && !window.opera) ? true : false;
}
//取得頁面的高寬
function getBodySize(){
  var bodySize = [];
  with(document.documentElement) {
  bodySize[0] = (scrollWidth>clientWidth)?scrollWidth:clientWidth;//如果滾動條的寬度大于頁面的寬度，取得滾動條的寬度，否則取頁面寬度
  bodySize[1] = (scrollHeight>clientHeight)?scrollHeight:clientHeight;//如果滾動條的高度大于頁面的高度，取得滾動條的高度，否則取高度
  }
  return bodySize;
}
//創(chuàng)建遮蓋層
function popCoverDiv(){
  if (M("cover_div")) {
  //如果存在遮蓋層，則讓其顯示
  M("cover_div").style.display = 'block';
  } else {
  //否則創(chuàng)建遮蓋層
  var coverDiv = MC('div');
  document.body.appendChild(coverDiv);
  coverDiv.id = 'cover_div';
  with(coverDiv.style) {
   position = 'absolute';
   background = '#CCCCCC';
   left = '0px';
   top = '0px';
   var bodySize = getBodySize();
   width = bodySize[0] + 'px'
   height = bodySize[1] + 'px';
   zIndex = 0;
   if (isIE()) {
   filter = "Alpha(Opacity=60)";//IE逆境
   } else {
   opacity = 0.6;
   }
  }
  }
}
//讓登陸層顯示為塊
function showLogin()
{
  var login=M("login");
  login.style.display = "block";
}
//設(shè)置DIV層的樣式
function change(){
   var login = M("login");
   login.style.position = "absolute";
   login.style.border = "1px solid #CCCCCC";
   login.style.background ="#F6F6F6";
   var i=0;
   var bodySize = getBodySize();
   login.style.left = (bodySize[0]-i*i*4)/2+"px";
   login.style.top = (bodySize[1]/2-100-i*i)+"px";
   login.style.width =   i*i*4 + "px";
   login.style.height = i*i*1.5 + "px";
   popChange(i);
}
//讓DIV層大小循環(huán)增大
function popChange(i){
   var login = M("login");
   var bodySize = getBodySize();
   login.style.left = (bodySize[0]-i*i*4)/2+"px";
   login.style.top = (bodySize[1]/2-100-i*i)+"px";
   login.style.width =   i*i*4 + "px";
   login.style.height = i*i*1.5+ "px";
   if(i<=10){
      i++;
      setTimeout("popChange("+i+")",10);//設(shè)置超時10毫秒
   }
}
//打開DIV層
function open()
{
    change();
    showLogin();
    popCoverDiv()
    void(0);//不進(jìn)行任何操作,如：<a href="#">aaa</a>
}
//關(guān)閉DIV層
function close(){
     M('login').style.display = 'none';
     M("cover_div").style.display = 'none';
    void(0);
}
</script>
</head>
<body>
<br>
<br>
<div align="center"><a href="javascript:open();" class="STYLE1">登陸</a></div>
<div id="login">
<span>用戶登陸</span>
  <div id="panel">
  <lable>用戶名:&nbsp;</lable><input type="text" size="20" />
  <lable>密碼:&nbsp;</lable><input type="password" size="20">
  <input type="checkbox" /><lable>登陸</lable>
  </div>
  <input type="button" value="提交" />
  <a href="javascript:close();">關(guān)閉</a>
</div>
</body>
</html>

更多關(guān)于JavaScript相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《JavaScript查找算法技巧總結(jié)》、《JavaScript動畫特效與技巧匯總》、《JavaScript錯誤與調(diào)試技巧總結(jié)》、《JavaScript數(shù)據(jù)結(jié)構(gòu)與算法技巧總結(jié)》、《JavaScript遍歷算法與技巧總結(jié)》及《JavaScript數(shù)學(xué)運(yùn)算用法總結(jié)》

希望本文所述對大家JavaScript程序設(shè)計有所幫助。

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