let arr =[1,2,3,4] for(let i in arr){console.log(i)} 0 1 2 3 for(let i of arr){console.log(i)} 1 2 3 4 let obj={a:1,v:2} for(let i in obj){console.log(i)} a v for(let i of obj){console.log(i)} //报错 obj is not iterable
看完大概就能明白了吧!
let arr =[1,2,3,4] for(let i in arr){console.log(i)} 0 1 2 3 for(let i of arr){console.log(i)} 1 2 3 4 let obj={a:1,v:2} for(let i in obj){console.log(i)} a v for(let i of obj){console.log(i)} //报错 obj is not iterable
看完大概就能明白了吧!