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• 句法
• 描述
• Polyfill
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

some() method tests whether some element in the typed array passes the test implemented by the provided function. This method has the same algorithm as Array.prototype.some() . TypedArray is one of the typed array types here.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

句法

typedarray.some(callback[, thisArg])
					

参数

callback

Function to test for each element, taking three arguments:

currentValue

The current element being processed in the typed array.

index

The index of the current element being processed in the typed array.

array

The typed array some was called upon.

thisArg

Optional. Value to use as this when executing callback .

返回值

true if the callback function returns a truthy value for any array element; otherwise, false .

描述

some method executes the callback function once for each element present in the typed array until it finds one where callback returns a true value. If such an element is found, some immediately returns true . Otherwise, some 返回 false .

callback is invoked with three arguments: the value of the element, the index of the element, and the array object being traversed.

若 thisArg parameter is provided to some , it will be passed to callback when invoked, for use as its this value. Otherwise, the value undefined will be passed for use as its this value.  The this value ultimately observable by callback is determined according to the usual rules for determining the this seen by a function .

some does not mutate the typed array on which it is called.

Polyfill

Since there is no global object with the name TypedArray , polyfilling must be done on an "as needed" basis.

// https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.some
if (!Uint8Array.prototype.some) {
  Object.defineProperty(Uint8Array.prototype, 'some', {
    value: Array.prototype.some
  });
}
								

If you need to support truly obsolete JavaScript engines that don't support Object.defineProperty , it's best not to polyfill Array.prototype methods at all, as you can't make them non-enumerable.

范例

Testing size of all typed array elements

The following example tests whether any element in the typed array is bigger than 10.

function isBiggerThan10(element, index, array) {
  return element > 10;
}
new Uint8Array([2, 5, 8, 1, 4]).some(isBiggerThan10); // false
new Uint8Array([12, 5, 8, 1, 4]).some(isBiggerThan10); // true
								

Testing typed array elements using arrow functions

箭头函数 provide a shorter syntax for the same test.

new Uint8Array([2, 5, 8, 1, 4]).some(elem => elem > 10); // false
new Uint8Array([12, 5, 8, 1, 4]).some(elem => elem > 10); // true
								

规范

规范
ECMAScript (ECMA-262) The definition of 'TypedArray.prototype.some' in that specification.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
some	Chrome 45	Edge 14	Firefox 37	IE No	Opera 32	Safari 10	WebView Android 45	Chrome Android 45	Firefox Android 37	Opera Android No	Safari iOS 10	Samsung Internet Android 5.0	nodejs 4.0.0

图例

完整支持

完整支持

不支持

不支持

另请参阅

• TypedArray.prototype.every()
• Array.prototype.some()

元数据

• 最后修改： May 20, 2020

相关话题

1. 标准内置对象
2. TypedArray
3. 特性
   1. TypedArray.BYTES_PER_ELEMENT
   2. TypedArray.name
   3. TypedArray.prototype.buffer
   4. TypedArray.prototype.byteLength
   5. TypedArray.prototype.byteOffset
   6. TypedArray.prototype.length
   7. get TypedArray[@@species]
4. 方法
   1. TypedArray.from()
   2. TypedArray.of()
   3. TypedArray.prototype.copyWithin()
   4. TypedArray.prototype.entries()
   5. TypedArray.prototype.every()
   6. TypedArray.prototype.fill()
   7. TypedArray.prototype.filter()
   8. TypedArray.prototype.find()
   9. TypedArray.prototype.findIndex()
   10. TypedArray.prototype.forEach()
   11. TypedArray.prototype.includes()
   12. TypedArray.prototype.indexOf()
   13. TypedArray.prototype.join()
   14. TypedArray.prototype.keys()
   15. TypedArray.prototype.lastIndexOf()
   16. TypedArray.prototype.map()
   17. TypedArray.prototype.reduce()
   18. TypedArray.prototype.reduceRight()
   19. TypedArray.prototype.reverse()
   20. TypedArray.prototype.set()
   21. TypedArray.prototype.slice()
   22. TypedArray.prototype.some()
   23. TypedArray.prototype.sort()
   24. TypedArray.prototype.subarray()
   25. TypedArray.prototype.toLocaleString()
   26. TypedArray.prototype.toString()
   27. TypedArray.prototype.values()
   28. TypedArray.prototype[@@iterator]()
5. 相关页面：
6. Int8Array
7. Uint8Array
8. Uint8ClampedArray
9. Int16Array
10. Uint16Array
11. Int32Array
12. Uint32Array
13. Float32Array
14. Float64Array
15. BigInt64Array
16. BigUint64Array
17. 继承：
18. Function
19. 特性
    1. Function.arguments
    2. Function.caller
    3. Function.displayName
    4. Function.length
    5. Function.name
20. 方法
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toSource()
    5. Function.prototype.toString()
21. Object
22. 特性
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
23. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()