JS中for..of對象的遍歷補充

let {keys, values, entries} = Object
let a = {
    "b":'1',
    "c":'2',
    "d":'3'
}
for (let s of keys(a)) {
    // b c d
    console.log(s)
}
for (let s of values(a)) {
    // 1 2 3
    console.log(s)
}
for (let s of entries(a)) {
    // ["b":'1'],["c":'2'],["d":'3']
    console.log(s)
}

 注：上面是使用for...of來進行遍歷，下面的是常用的

for (let s in a) {
    // b c d
    console.log(s)
    // 1 2 3
    console.log(a[s])
}