JS学习笔记-Map和Set

JS学习笔记-Map和Set

• Map的定义

var stus = new Map([['stu1',20],['stu2',50],['stu3',80]]);
var stu = stus.get('stu1');		//通过key获得value
console.log(stu);
20
stus.set('stu4',90);		//像Map stus中添入一组数据
stu = stus.get('stu4');
console.log(stu);
90
stus.delete('stu1');	//删除该键值对

• Set无序不重复集合

var set = new Set([1,1,1,1,2])
set
Set(2) {1,2}
set.add(3)		//添加
set.delete(1)	//删除
set.has(1)	//判断是否含有该元素