对于JS中一些类型的转化的东西，自己测试并得出的结论，有错误的地方请大大们留言。
不多废话，直接贴代码，测试请直接拷贝全部代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Examples</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
</head>
<body>
<script type="text/javascript">
var myNumber = new Number(23);
var myNumber2 = 23;
var myString = new String('male');
var myString2 = 'male';
var myBoolean = new Boolean(false);
var myBoolean2 = false;
var myObject = new Object();
var myObject2 = {};
var myArray = new Array('foo','bar');
var myArray2 = ['foo','bar'];
var myFunction = new Function('x','y','return x*y');
var myFunction2 = function(x,y){return x*y};
var myRegExp = new RegExp('t[a-z]+');
var myRegExp2 = /t[a-z]+/;
console.log(myNumber.constructor,myNumber2.constructor);
console.log(myString.constructor,myString2.constructor);
console.log(myBoolean.constructor,myBoolean2.constructor);
console.log(myObject.constructor,myObject2.constructor);
console.log(myArray.constructor,myArray2.constructor);
console.log(myFunction.constructor,myFunction2.constructor);
console.log(myRegExp.constructor,myRegExp2.constructor);
console.log(typeof myNumber);
console.log(typeof myNumber2);
</script>
</body>
</html>
输出：
结论：
JS中的字面量（基本类型）的构造函数为其包装类，也就是说赋值的时候先将基本类型转化为包装类型，然后包装类型再返回一个基本类型的值。而与包装类型对应的为Number,String,Boolean。这是由上面例子得出的。