JavaScript遍历数组的方法代码实例

时间:2020-05-17 小雪同学人气:0

这篇文章主要介绍了JavaScript遍历数组的方法代码实例,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

for循环

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

for...of

遍历出数组中的每个值

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

for..in

遍历出数组中每个值的下标

 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

遍历出数组中每个值的键（下标）　　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

遍历出数组中的每个值　　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

遍历出数组中的每个值，以及每个值对应的下标　　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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