Node.js util.types.isProxy()方法
原文:https://www . geesforgeks . org/node-js-util-types-isproxy-method/
util.types.isProxy()方法是 util 模块的内置应用编程接口,主要是为了支持 Node.js 自身内部 API 的需求而设计的。 util.types.isProxy()方法用于检查给定值是否是代理实例。
语法:
util.types.isProxy( value )
参数:该函数接受如上所述的单个参数,如下所述:
- Value: It is the value to be checked for the proxy instance.
返回值:如果传递的值是代理,则返回布尔值,即真,否则返回假。
下面的程序说明了 util.types.isProxy() 方法:
例 1:
// Node.js program to demonstrate the
// util.types.isProxy() method
// Import the util module
const util = require('util');
// Creating a target
const target = {};
// Checking the proxy instance
let proxyObj = new Proxy(target, {});
console.log(proxyObj);
isProxy = util.types.isProxy(proxyObj);
console.log("Object is a proxy instance:", isProxy);
// Checking a normal object
normalObj = {a: "1", b: "2"};
console.log(normalObj);
isProxy = util.types.isProxy(normalObj);
console.log("Object is a proxy instance:", isProxy);
输出:
{}
Object is a proxy instance: true
{ a: '1', b: '2' }
Object is a proxy instance: false
例 2:
// Node.js program to demonstrate the
// util.types.isProxy() method
// Import the util module
const util = require('util');
// Creating a target
const target = {};
// Checking the proxy object
console.log("Object is a proxy instance:");
console.log(util.types.isProxy(new Proxy(target, {})));
// Checking a normal object
console.log("Object is a proxy instance:");
console.log(util.types.isProxy(new Object()));
输出:
Object is a proxy instance:
true
Object is a proxy instance:
false
参考:T2】https://nodejs . org/API/util . html # util _ util _ types _ isproxy _ value
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