JavaScript中怎樣遍歷數(shù)組

JavaScript中怎樣遍歷數(shù)組，針對(duì)這個(gè)問(wèn)題，這篇文章詳細(xì)介紹了相對(duì)應(yīng)的分析和解答，希望可以幫助更多想解決這個(gè)問(wèn)題的小伙伴找到更簡(jiǎn)單易行的方法。

for循環(huán)

let arr=["A","B","C","D","E","F"]; for(let i=0;i<arr.length;i++){  console.log(arr[i]); }

for...of

遍歷出數(shù)組中的每個(gè)值

let arr=["A","B","C","D","E","F"]; for(let item of arr){   console.log(item); }//A B C D E F

for..in

遍歷出數(shù)組中每個(gè)值的下標(biāo)

let arr=["A","B","D","E","F"]; for(let item in arr){   console.log(item); }//0 1 2 3 4 5

ES6新增for...of的用法

遍歷出數(shù)組中每個(gè)值的鍵（下標(biāo)）　　arr.keys()

let arr=["A","B","C","D","E","F"]; for(let item of arr.keys()){   console.log(item); } //0 1 2 3 4 5

遍歷出數(shù)組中的每個(gè)值　　arr.values()

let arr=["A","B","C","D","E","F"]; for(let item of arr.values()){   console.log(item); } //A B C D E F

遍歷出數(shù)組中的每個(gè)值，以及每個(gè)值對(duì)應(yīng)的下標(biāo)　　arr.entries()

let arr=["A","B","C","D","E","F"];for(let item of arr.entries()){  console.log(item);}/**[ 0, 'A' ][ 1, 'B' ][ 2, 'C' ][ 3, 'D' ][ 4, 'E' ][ 5, 'F' ]**/

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