Iterable

ES6新特性
遍历数组

// for of 打印值 ， for in 打印下标
var arr = [4,5,6]
for (const number of arr) {console.log(number)
}

遍历Map

var map = new Map([['whl',100],['ht',110],['other',0]])
for (let x of map) {console.log(x)console.log(x[0])console.log(x[1])
}

遍历Set

var set = new Set([4,5,6])
for(let x of set) {console.log(x)
}

一个漏洞

var arr = [4,5,6]
arr.name = "43"
console.log(arr)for (let x in arr) {console.log(x)
}console.log("==========")
for (let number of arr) {console.log(number)
}

for of 不会打印出这个错误，但是 for in 会打印出

https://www.bilibili.com/video/BV1JJ41177di?p=11