1、使用Object.assign(target，source1，source2)//将源对象可枚举属性复制到目标对象

var a={name:"ming"}
var b=Object.assign({},a)
b.name="huan"
console.log(a.name)//ming
console.log(a.name)//huan

2、ES6展开运算符

var a={name:"ming"}
var b=[...a]
b.name="huan"
console.log(a.name)//ming
console.log(a.name)//huan

3、使用JSON.parse(JSON.stringify()),序列化方式

var a={name:"ming"}
var b=JSON.parse(JSON.stringify(a))
b.name="huan"
console.log(a.name)//ming
console.log(a.name)//huan