util模塊的util.types.isUint8Array()方法主要用於滿足Node.js自己的內部API的需求。它用於檢查方法中傳遞的實例是否為內置 Uint8Array實例。
用法
util.types.isUint8Array( value )
參數：此方法接受單個參數值，該參數值包含任何值，即任何模塊的實例。
返回值：此方法返回一個布爾值，即，如果傳遞的值是Uint8Array的實例，則返回true，否則返回false。
以下示例說明了Node.js中util.types.isUint8Array()方法的使用：
範例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())); 輸出：
false true
範例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);
// Intializing 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);
// Intializing the zeroth element
array5[0] = 10;
// Returns false as passed instance
// is of Int16Array
console.log(util.types.isUint8Array(array5)); 輸出：
true true true false
參考： https://nodejs.org/api/util.html#util_util_types_isuint8array_value
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