String.includes
时间: 2023-02-11 15:45:40 浏览: 85
`String.includes()` 是 JavaScript 中字符串对象的一个方法。它接受一个字符串作为参数,并返回一个布尔值,表示当前字符串中是否包含该参数字符串。如果包含,则返回 true,否则返回 false。
示例:
```
let str = "hello world";
console.log(str.includes("world")); // true
console.log(str.includes("javascript")); // false
```
该函数可以接受第二个可选的参数,表示开始搜索字符串的位置
```
let str = "hello world";
console.log(str.includes("o", 4)); //true
console.log(str.includes("o", 5)); //false
```
相关问题
item.filter(item => item.name.includes(this.formInline.name)&&item.area.includes(this.formInline.area))
This code is filtering an array of objects based on the value of the "name" property of each object. It is using the "includes" method to check if the value of the "name" property contains the string stored in "this.formInline.name".
For example, if the "formInline.name" variable has a value of "apple", this code will return all objects in the array that have a "name" property containing the string "apple".
It is important to note that this code is not complete and is missing the closing parenthesis and curly brace of the "filter" method. The complete code should look like this:
```
item.filter(item => item.name.includes(this.formInline.name));
```
js方法includes
JavaScript中的`includes`方法用于检查数组或字符串中是否包含指定的值并返回一个布尔值。它的语法如下:
1. 对于数组:`array.includes(valueToFind, fromIndex)`
2. 对于字符串:`string.includes(searchValue, fromIndex)`
- `valueToFind` 或 `searchValue` 是要查找的值。
- `fromIndex` 是可选的参数,指定开始搜索的索引位置。
例如,对于数组:
```javascript
const array = [1, 2, 3, 4, 5];
console.log(array.includes(3)); // true
console.log(array.includes(6)); // false
console.log(array.includes(2, 2)); // false
```
对于字符串:
```javascript
const string = 'Hello, World!';
console.log(string.includes('Hello')); // true
console.log(string.includes('Foo')); // false
console.log(string.includes('World', 7)); // true
```
希望这能回答你的问题!如果还有其他问题,请继续提问。