Div透明代码，透明的box背景

时间：2013-06-02 10:09 来源：互联网作者：源码搜藏浏览：次收藏挑错推荐打印

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/transitional.dtd">
<html>
<head>
<title>透明Div的实现</title>
<style type="text/css">
body {
     background: url(http://www.codesocang.com/images/04.jpg);
     background-repeat: no-repeat;
}
div.box {
     border: 1px solid #000000;
     position: relative;
     width: 100%;
}
div.box_contents {
     background-color:transparent;
     height: 100%;
     position: relative;
     width: 100%;
     z-index: 101;
}
div.box_background {
     background-color: white;
     height: 100%;
     filter:alpha(opacity=75); /* IE's opacity*/
     left: 0px;
     opacity: 0.75;
     position: absolute;
     top: 0px;
     width: 100%;
     z-index: 99;
}
</style>
<script type="text/javascript">
function change_w(id, pixels) {
     var x = document.getElementById(id);
     x.style.width = x.offsetWidth + pixels + "px";
}
function change_h(id, pixels) {
     var x = document.getElementById(id);
     x.style.height = x.offsetHeight + pixels + "px";
}
function getElementsByName_iefix(tag, name) {
     var elem = document.getElementsByTagName(tag);
     var arr = new Array();
     for(i = 0, iarr = 0; i < elem.length; i++) {
          att = elem[i].getAttribute("name");
          if(att == name) {
               arr[iarr] = elem[i];
               iarr++;
          }
     }
     return arr;
}
function transparentbg(tbg_id) {
     var bak = getElementsByName_iefix("div", tbg_id);
     for(i = 0; i < bak.length; i++) {
          bak[i].style.height = bak[i].parentNode.clientHeight + "px";
          bak[i].style.width  = bak[i].parentNode.clientWidth + "px";
     }
}
</script>
</head>
<body onload="transparentbg('bg_name')" onclick="transparentbg('bg_name')">
<div style="width: 470px;">
     <div class="box" id="box">
          <div class="box_background" name="bg_name"> </div>
          <div class="box_contents">
               宽度控制: <input type="button" value="+" onclick="change_w('box', 30);" /> / <input type="button" value="-" onClick="change_w('box', -30);" /><br />
               高度控制: <input type="button" value="+" onclick="change_h('box', 30);" /> / <input type="button" value="-" onClick="change_h('box', -30);" /><br />
               <div style="padding: 2px; font-weight: bolder; font-size: 14px;">
                    <br />这里是Box盒子的内容! :O <br />
                    <br />
               </div>
          </div>
     </div>
</div>
</body>
</html>

Div透明代码，透明的box背景

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