话不多说，直接贴代码～
var eles = [];
function( paramClass,paramId ){
oParent = paramId ? document.getElementById( paramId ) : document;
//获取父级id下的所有class
elements = document.getElementsByTagName('*');
for(var i = 0, l = elements.length;i < l; i++){
if(elements[i].className == paramClass){
//把获取class放在缓存数组中
eles.push( elements[i] );
};
};
// console.log(eles);
return eles;
}
