TypedArray.prototype.includes()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.
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类型之一。
语法
js
includes(searchElement)
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
示例
js
var uint8 = new Uint8Array([1, 2, 3]);
uint8.includes(2); // true
uint8.includes(4); // false
uint8.includes(3, 3); // false
// NaN 的处理(仅仅对 Float32 和 Float64 为 true)
new Uint8Array([NaN]).includes(NaN); // false,因为 NaN 传递给构造器时转换为 0
new Float32Array([NaN]).includes(NaN); // true;
new Float64Array([NaN]).includes(NaN); // true;
规范
Specification |
---|
ECMAScript Language Specification # sec-%typedarray%.prototype.includes |
浏览器兼容性
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