set数组
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<h1>set的用法</h1>
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<script>
var arr =[1,2,3,4,4,4,5,5,5,6]
var s=new Set(arr) //数组去重
console.log(s); //打印的是set形式
var a=Array.from(s); //set形式转换成数组的形式
console.log(a[2])
</script>
map对象
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<h1>map的使用</h1>
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<script>
var obj={"name":"马永民"}; //普通对象的属性名必须是字符串
console.log(obj)
var m=new Map()
var info=[1,2,2];
//map对象用set赋指
m.set(info,"mayongmin1111")
console.log(m)
//map的属性值可以使任何类型
</script>
