JS学习笔记-Iterator

JS学习笔记-Iterator

• 使用Iterator遍历数组

// 通过for of 具体元素/for in 下标
var arr = [3,4,5];
for(var x of arr){
    console.log(x);
}
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5

• 遍历Map(只可用这个)

var map = new Map([['s1',20],['s2',30],['s3',50]]);
for(let x of map){
    console.log(x);
}
['s1',100]
['s2',30]
['s3',50]

• 遍历Set

var set = new Set([1,2,3]);
for(let x of set){
    console.log(x);
}
1
2
3