Js检查变量类型的代码()

function getType(o) { 
var _t; return ((_t = typeof(o)) == "object" ? o==null && "null" || Object.prototype.toString.call(o).slice(8,-1):_t).toLowerCase(); 
} 
 

执行结果： 

getType("abc"); //string 
getType(true); //boolean 
getType(123); //number 
getType([]); //array 
getType({}); //object 
getType(function(){}); //function 
getType(new Date); //date 
getType(new RegExp); //regexp 
getType(Math); //math 
getType(null); //null