数据类型

var a = 95;//Number
var b = 'name';//String
var c = function(){
  return 'Hello World';
};//String
var d = 10/+0;//Number(+Infinity)
var g = 10/-0;//Number(-Infinity)
var l = 10/'a';//Number(NaN)
var e = null;//Object
var f = undefined;//Undefined