关于IE8 、IE7不支持getElementsByClassName的结局方案
复制此代码到<header></header>
<!--[if IE 8]>
<script type="text/javascript">
if(!document.getElementsByClassName){
document.getElementsByClassName = function(className, element){
var children = (element || document).getElementsByTagName('*');
var elements = new Array();
for (var i=0; i<children.length; i++){
var child = children[i];
var classNames = child.className.split(' ');
for (var j=0; j<classNames.length; j++){
if (classNames[j] == className){
elements.push(child);
break;
}
}
}
return elements;
};
}
</script>
<![endif]-->