node . js util . types . isuit 8 array()方法
原文:https://www . geesforgeks . org/node-js-util-types-ISU int8 array-method/
util 模块的util . types . isuit 8 array()方法，主要是为了支持 Node.js 自带的内部 API 的需求而设计的。它用于检查方法中传递的实例是否是内置的 Uint8Array 实例。
语法
util.types.isUint8Array( value )
参数:该方法接受单个参数值，该值保存任何值，即任何模块的实例。
返回值:该方法返回一个布尔值，即如果传递的值是 Uint8Array 的实例，则返回 true ，否则返回 false 。
下面的例子说明了在 Node.js 中使用util . types . isint8 array()方法:
例 1:
// Node.js program to demonstrate the
// util.types.isUint8Array() method
// It includes util module
const util = require('util');
// Return false as passed instance is of set
console.log(util.types.isUint8Array(new Set()));
// Return true as passed instance is of Uint8Array
console.log(util.types.isUint8Array(new Uint8Array()));
输出:
false
true
例 2:
// Node.js program to demonstrate the
// util.types.isUint8Array() method
// It includes util module
const util = require('util');
// Making an instance of Uint8Array
// of size 2
var array1 = new Uint8Array(2);
// Initializing the zeroth element
array1[0] = 42;
// Returns true as passed instance
// is of Uint8Array
console.log(util.types.isUint8Array(array1));
// Making an instance of Uint8Array
var array2 = new Uint8Array([21, 31]);
// Returns true as passed instance
// is of Uint8Array
console.log(util.types.isUint8Array(array2));
// Making an instance of Uint8Array
var array3 = new Uint8Array([21, 31]);
// Making another instance of Uint8Array by
// passing an instance of Uint8Array
var array4 = new Uint8Array(array3);
// Returns true as passed instance
// is of Uint8Array
console.log(util.types.isUint8Array(array4));
// Making an instance of Int16Array of size 2
var array5 = new Int16Array(2);
// Initializing the zeroth element
array5[0] = 10;
// Returns false as passed instance
// is of Int16Array
console.log(util.types.isUint8Array(array5));
输出:
true
true
true
false
参考:https://nodejs . org/API/util . html # util _ util _ types _ isint 8 array _ value
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