var isArray = function(){
return arguments;
}
isArray(1,2,3); // 返回[1,2,3]
isArray.call(null,1,2,3); //返回[1,2,3]
isArray.applay(null,[1,2,3]); //返回[1,2,3]
类数组arguments
原文:http://www.cnblogs.com/aliwa/p/6418736.html