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javascript實現一個簡單的彈出窗，javascript實現
功能介紹：點擊一個按鈕，然後頁面會彈出一個視窗，而頁面原來的內容會保持不變，只是在其頁面上加了一個遮罩層，設定了不透明度，彈出的視窗可設定在固定位置，也可以自由設定，常見於網站的登入按鈕。
html頁面：
<!DOCTYPE html><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>js實現一個彈出框</title><style type="text/css">/*預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">登入</button> </div></div></body></html>
js代碼：
<script>function openNew(){ //擷取頁面的高度和寬度 var sWidth=document.body.scrollWidth; var sHeight=document.body.scrollHeight; //擷取頁面的可視地區高度和寬度 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'>關閉</div></div>"; document.body.appendChild(oLogin); //擷取登陸框的寬和高 var dHeight=oLogin.offsetHeight; var dWidth=oLogin.offsetWidth; //設定登陸框的left和top oLogin.style.left=sWidth/2-dWidth/2+"px"; oLogin.style.top=wHeight/2-dHeight/2+"px"; //點擊關閉按鈕 var oClose=document.getElementById("close"); //點擊登陸框以外的地區也可以關閉登陸框 oClose.onclick=oMask.onclick=function(){ document.body.removeChild(oLogin); document.body.removeChild(oMask); }; }; window.onload=function(){ var oBtn=document.getElementById("btnLogin"); //點擊登入按鈕 oBtn.onclick=function(){ openNew(); return false; } }</script>
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