js批量修改CSS定义
当需要批量修改某些元素的样式时，可以直接用JS修改CSS的定义<style type="text/css">
div{
height:300px;
width:300px;
border:1px #003399 solid;
background-color:#006633;
}
</style>
<script language="JavaScript" type="text/javascript">
if(document.all){//兼容IE
document.styleSheets.rules.style.height="100px";
}else{//兼容firefox
document.styleSheets.cssRules.style.height="100px";
}
//alert(document.getElementsByTagName('style').innerHTML);
</script>
写成函数，由于样式名只能用数字来索引，所以用了DOM遍历（此函数来源于：http://tb.blog.csdn.net/TrackBack.aspx?PostId=1885195）
<style>
.exampleA{}
.exampleB{}
</style>
<script>
function changecss(theClass,element,value) {
var cssRules;
if (document.all) {
cssRules = 'rules';
}
else if (document.getElementById) {
cssRules = 'cssRules';
}
for (var S = 0; S < document.styleSheets.length; S++){
for (var R = 0; R < document.styleSheets.length; R++) {
if (document.styleSheets.selectorText == theClass) {
document.styleSheets.style = value;
}
}
}
}
</script>
<span class="exampleA">Example A</span>
<span class="exampleB">Example B</span>
<span class="exampleA">Example A</span>
<input type="button" value="Change A Red"/><input type="button" value="Change A Black"/>
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