js获得ID、NAME、TagName_网络飞虎

var $ = function(o){return (typeof o == "object") ? o: document.getElementById(o)};
var $N = function(o){return (typeof o == "object") ? o: document.getElementsByName(o)};
var $T = function(o){return (typeof o == "object") ? o: document.getElementsByTagName(o)};

tagname--标签元素， 使用tagname "*"传回文件中所有找到的元素