TypedArray.prototype.includes()

¥Syntax

includes(searchElement)
includes(searchElement, fromIndex)

¥Parameters

searchElement

要搜索的值。

fromIndex Optional

开始搜索的从零开始的索引，转换为整数。

¥Return value

如果在类型化数组（或由索引 fromIndex 指示的类型化数组的一部分，如果指定）中找到值 searchElement，则为 true 的布尔值。

¥A boolean value which is true if the value searchElement is found within the typed array (or the part of the typed array indicated by the index fromIndex, if specified).

¥Description

详细信息请参见 Array.prototype.includes()。此方法不是通用的，只能在类型化数组实例上调用。

¥See Array.prototype.includes() for more details. This method is not generic and can only be called on typed array instances.

¥Examples

¥Using includes()

const uint8 = new Uint8Array([1, 2, 3]);
uint8.includes(2); // true
uint8.includes(4); // false
uint8.includes(3, 3); // false

// NaN handling (only true for Float32 and Float64)
new Uint8Array([NaN]).includes(NaN); // false, since the NaN passed to the constructor gets converted to 0
new Float32Array([NaN]).includes(NaN); // true;
new Float64Array([NaN]).includes(NaN); // true;

¥See also

• core-js 中 TypedArray.prototype.includes 的 Polyfill
• JavaScript 类型数组 指南
• TypedArray
• TypedArray.prototype.indexOf()
• TypedArray.prototype.find()
• TypedArray.prototype.findIndex()
• Array.prototype.includes()
• String.prototype.includes()