typedArray.includes

includes()方法判断类型化数组中是否含有特定元素，并相应返回true或者false，这个方法的算法和Array.prototype.includes()相同。TypedArray是这里的类型化数组之一。

语法

typedarray.includes(searchElement[, fromIndex]

参数

searchElement要搜索的元素。fromIndex可选，数组中的位置，在这里开始搜索searchElement；默认为 0。

返回值

一个Boolean.

示例

var 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;

规范

Specification	Status	Comment
ECMAScript 2016 (ECMA-262)The definition of 'TypedArray.prototype.includes' in that specification.	Standard	Initial definition.
ECMAScript 2017 Draft (ECMA-262)The definition of 'TypedArray.prototype.includes' in that specification.	Draft

浏览器兼容性

Feature	Chrome	Firefox (Gecko)	Edge	Internet Explorer	Opera	Safari
Basic support	47	43	14	No support	34	10

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	No support	47	43	No support	34	10