JsArray怎么遍历
时间: 2024-02-04 08:07:38 浏览: 23
JsArray可以使用多种方式进行遍历,以下是常用的几种方式:
1. for循环遍历
```javascript
let arr = [1, 2, 3];
for(let i = 0; i < arr.length; i++){
console.log(arr[i]);
}
```
2. forEach方法遍历
```javascript
let arr = [1, 2, 3];
arr.forEach(function(item){
console.log(item);
});
```
3. map方法遍历
```javascript
let arr = [1, 2, 3];
let newArr = arr.map(function(item){
return item * 2;
});
console.log(newArr);
```
4. filter方法遍历
```javascript
let arr = [1, 2, 3];
let newArr = arr.filter(function(item){
return item > 1;
});
console.log(newArr);
```
5. for...in遍历对象属性
```javascript
let obj = {a: 1, b: 2, c: 3};
for(let key in obj){
console.log(key + ': ' + obj[key]);
}
```
6. for...of遍历可迭代对象
```javascript
let arr = [1, 2, 3];
for(let item of arr){
console.log(item);
}
```