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JavaScript 类型化数组 includes() 方法


示例

// 创建类型化数组
const myArr = Int16Array.from([10,15,20,25,30,35,40,45,50]);

// 查找值为 20 的元素
let result = myArr.indexOf(20);
亲自试一试 »
// 创建类型化数组
const myArr = Int16Array.from([10,15,20,25,30,35,40,45,50]);

// 查找值为 20 的元素
let result = myArr.indexOf(20, 3);
亲自试一试 »

描述

includes() 方法会在类型化数组包含指定值时返回 true

includes() 方法会在未找到指定值时返回 false

includes() 方法区分大小写。


语法

typed-array.includes(element, start)

typed-array 必须是以下类型之一:

Int8Array
Uint8Array
Uint8ClampedArray
Int16Array
Uint16Array
Int32Array
Uint32Array
Float16Array
Float32Array
Float64Array
BigInt64Array
BigUint64Array

参数

参数 描述
element 必填项。
要查找的值。
start 可选。
起始位置。默认值为 0。

返回值

类型 描述
布尔值 如果找到该值,则返回 true,否则返回 false

类型化数组查找方法:

方法 查找
includes() 如果数组中存在指定元素,则返回 true
indexOf() 查找第一个具有指定值的元素的索引
lastIndexOf() 查找最后一个具有指定值的元素的索引
find() 第一个通过测试的元素的值
findIndex() 第一个通过测试的元素的索引
findLast() 最后一个通过测试的元素的值
findLastIndex() 最后一个通过测试的元素的索引

浏览器支持

typed-array.includes() 是 JavaScript 2016 的一项特性。

ES 2016 自 2017 年 3 月起,所有现代浏览器均已支持 ES 2016。

Chrome Edge Firefox Safari Opera
Yes Yes Yes Yes Yes

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