js兼容性汇总

1、ie8不支持getElementsByClassName()方法

【解决办法】

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;
	};
}