util.types.isBoxedPrimitive()方法是util模块的内置应用程序编程接口，其主要设计用于满足Node.js自己的内部API的需求。
util.types.isBoxedPrimitive()方法用于检查给定值是否为盒装原语。
用法:
util.types.isBoxedPrimitive( value )
参数：该函数接受上面提到并在下面描述的一个参数：
- value:它是将对装箱原语进行检查的值。
返回值：它返回一个布尔值，即如果传递的值是一个装箱的原语，则返回true，否则返回false。
以下示例说明了Node.js中的util.types.isBoxedPrimitive()方法：
范例1：
// Node.js program to demonstrate the
// util.types.isBoxedPrimitive() method
// Import the util module
const util = require('util');
// Checking an unboxed string
let unboxedString = "GeeksforGeeks";
console.log("Value:", unboxedString);
isBoxed = util.types.isBoxedPrimitive(unboxedString);
console.log("Value is a boxed primitive:", isBoxed);
// Checking a boxed string
let boxedString = new String("GeeksforGeeks");
console.log("Value:", boxedString);
isBoxed = util.types.isBoxedPrimitive(boxedString);
console.log("Value is a boxed primitive:", isBoxed);
// Checking an unboxed integer
let unboxedInteger = 99;
console.log("Value:", unboxedInteger);
isBoxed = util.types.isBoxedPrimitive(unboxedInteger);
console.log("Value is a boxed primitive:", isBoxed);
// Checking a boxed integer
let boxedInt = new Number(99);
console.log("Value:", boxedInt);
isBoxed = util.types.isBoxedPrimitive(boxedInt);
console.log("Value is a boxed primitive:", isBoxed);
// Checking an unboxed boolean
let unboxedBool = false;
console.log("Value:", unboxedBool);
isBoxed = util.types.isBoxedPrimitive(unboxedBool);
console.log("Value is a boxed primitive:", isBoxed);
// Checking a boxed boolean
let boxedBool = new Boolean(false);
console.log("Value:", boxedBool);
isBoxed = util.types.isBoxedPrimitive(boxedBool);
console.log("Value is a boxed primitive:", isBoxed);输出：
Value:GeeksforGeeks Value is a boxed primitive:false Value:[String:'GeeksforGeeks'] Value is a boxed primitive:true Value:99 Value is a boxed primitive:false Value:[Number:99] Value is a boxed primitive:true Value:false Value is a boxed primitive:false Value:[Boolean:false] Value is a boxed primitive:true
范例2：
// Node.js program to demonstrate the
// util.types.isBoxedPrimitive() method
// Import the util module
const util = require('util');
// Checking for the symbol primitive
let symbol = Symbol('geeks');
console.log("Value:", symbol);
isBoxed = util.types.isBoxedPrimitive(symbol);
console.log("Value is a boxed primitive:", isBoxed);
// Checking again after creating a symbol wrapper
let symbolObj = new Object(Symbol('geeks'));
console.log("Value:", symbolObj);
isBoxed = util.types.isBoxedPrimitive(symbolObj);
console.log("Value is a boxed primitive:", isBoxed);Value:Symbol(geeks) Value is a boxed primitive:false Value:[Symbol:Symbol(geeks)] Value is a boxed primitive:true
参考： https://nodejs.org/api/util.html#util_util_types_isboxedprimitive_value
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注：本文由纯净天空筛选整理自sayantanm19大神的英文原创作品 Node.js | util.types.isBoxedPrimitive() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。