JavaScript对象引用机制与深拷贝实现

var a = new Object();
a.price = 173;
var b = a;
b.price = 170; //b更改了属性值，a的属性值一起会被改变
alert(a.price); //输出170

var a =3

var b = a;
b=4;
alert(a); //输出170

var a = new Object();
a.price = 173;

var b = JSON.parse(JSON.stringify(a));

b.price = 170; //b更改了属性值，a的属性值一起会被改变
alert(a.price); //输出173