数据过滤 js filter
时间: 2023-09-09 14:09:32 浏览: 55
在JavaScript中,可以使用filter方法对数组进行过滤。比如,如果你想要删除数组中的某些值,可以使用filter方法来实现。例如,给定一个数组arr1,包含["刘备","关羽","张飞","赵云"],如果想要过滤掉"赵云"和"刘备"这两项,即删除这两项,可以使用filter方法并返回过滤后的新数组。以下是一个示例代码:
```javascript
let arr1 = ["刘备","关羽","张飞","赵云"];
let newArr1 = arr1.filter((item) => {
return item != "赵云" && item != "刘备";
});
console.log(newArr1); // 输出 ["关羽", "张飞"]
```
另外,filter方法也可以用来删除数组中的某个索引对应的值。例如,给定一个数组arr2,包含["孙悟空", "猪八戒", "沙和尚", "唐僧", "白龙马"],如果想要过滤掉索引为2的那一项,即删除索引为2的那一项,可以使用filter方法并返回过滤后的新数组。以下是一个示例代码:
```javascript
let arr2 = ["孙悟空", "猪八戒", "沙和尚", "唐僧", "白龙马"];
let newArr2 = arr2.filter((item, index) => {
return index != 2;
});
console.log(newArr2); // 输出 ["孙悟空", "猪八戒", "唐僧", "白龙马"]
```
所以,使用filter方法可以实现对数据的过滤。
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