node . js | util . types . issharedraybuffer()方法
原文:https://www . geesforgeks . org/node-js-util-types-issharedraybuffer-method/
util 模块的util . types . IssharedrayBuffer()方法主要是为了支持 Node.js 自己的内部 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 SharedArrayBuffer 实例。
语法:
util.types.isSharedArrayBuffer( *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:如果传递的值是 SharedArrayBuffer 的实例,该方法返回一个布尔值,即真,否则返回假。
以下示例说明了在 Node.js 中使用util . types . issharedraybuffer()方法:
例 1:
// Node.js program to demonstrate the
// util.types.isSharedArrayBuffer() method
// It includes util module
const util = require('util');
// Return true as passed instance
// is of SharedArrayBuffer
console.log(util.types.isSharedArrayBuffer(
new SharedArrayBuffer()));
// Return false as passed instance
// is of Int32Array
console.log(util.types.isSharedArrayBuffer(
new Int32Array()));
// Return false as the passed instance is
// of ArrayBuffer, not SharedArrayBuffer
console.log(util.types.isSharedArrayBuffer(
new ArrayBuffer()));
输出:
true
false
false
例 2:
// Node.js program to demonstrate the
// util.types.isSharedArrayBuffer() method
// It includes util module
const util = require('util');
// making an instance of SharedArrayBuffer
// of size 1024
var sab = new SharedArrayBuffer(1024);
// Return true as passed instance is
// of SharedArrayBuffer
console.log(util.types.isSharedArrayBuffer(sab));
// Return true as slice method return new
// instance of sharedArrayBuffer
console.log(util.types.isSharedArrayBuffer(
sab.slice(100, 199)));
输出:
true
true
参考:https://nodejs . org/API/util . html # util _ util _ types _ issshared array buffer _ value
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