<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js實(shí)現(xiàn)一個(gè)彈出框</title>
<style type="text/css">
/*預(yù)先寫好彈出窗的樣式*/
#menu{height: 900px;}
#close{ 
  width:30px; 
  height:30px; 
  cursor:pointer; 
  position:absolute; 
  right:5px; 
  top:5px; 
  text-indent:-999em;
  background-color:blue;
  }
#mask{ 
  background-color:pink;
  opacity:0.5;
  filter: alpha(opacity=50); 
  position:absolute; 
  left:0;
  top:0;
  z-index:1;
  }
#login{ 
  position:fixed;
  z-index:2;
  }
.loginCon{ 
  position:relative; 
  width:670px;
  height:380px;
  /*background:url(img/loginBg.png) #2A2C2E center center no-repeat;*/
  background-color: #ccc;
  }
</style>

</head>
<body>
<div id="menu">
  <div id="login-area">
   <button id="btnLogin">登錄</button>
  </div>
</div>
</body>
</html>

js代碼：

<script>
function openNew(){
  //獲取頁面的高度和寬度
  var sWidth=document.body.scrollWidth;
  var sHeight=document.body.scrollHeight;
  
  //獲取頁面的可視區(qū)域高度和寬度
  var wHeight=document.documentElement.clientHeight;
  
  var oMask=document.createElement("div");
    oMask.id="mask";
    oMask.style.height=sHeight+"px";
    oMask.style.width=sWidth+"px";
    document.body.appendChild(oMask);
  var oLogin=document.createElement("div");
    oLogin.id="login";
    oLogin.innerHTML="<div class='loginCon'><div id='close'>關(guān)閉</div></div>";
    document.body.appendChild(oLogin);
  
  //獲取登陸框的寬和高
  var dHeight=oLogin.offsetHeight;
  var dWidth=oLogin.offsetWidth;
    //設(shè)置登陸框的left和top
    oLogin.style.left=sWidth/2-dWidth/2+"px";
    oLogin.style.top=wHeight/2-dHeight/2+"px";
  //點(diǎn)擊關(guān)閉按鈕
  var oClose=document.getElementById("close");
  
    //點(diǎn)擊登陸框以外的區(qū)域也可以關(guān)閉登陸框
    oClose.onclick=oMask.onclick=function(){
          document.body.removeChild(oLogin);
          document.body.removeChild(oMask);
          };
          };
          
  window.onload=function(){
      var oBtn=document.getElementById("btnLogin");
        //點(diǎn)擊登錄按鈕
        oBtn.onclick=function(){
          openNew();
          return false;
          }
        
    }
</script>

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