es6 map数据类型，要比set还很多

let json={
name:"websong",skili:"web"
};

//设置-增加
var msp=new Map();
msp.set(json,'iam');
console.info(msp)
msp.set('niubi','111')
console.info(msp)

//取值get
console.log(msp.get(json))
console.log(msp.get('niubi'))

//删除指定值delete,全部删除clert

console.log(msp.delete(json))
console.log(msp);

msp.clear()
console.log(msp)

console.log(msp.size)//长度

console.log(msp.has(json))//查找返回结果为布尔值