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js 简单模拟JSON.stringify 功能

news 2025/1/14 18:43:19

作用：序列化成一个 JSON 字符串的值

function stringifyJSON(value) {if (typeof value === "string") {//处理\和"，加上""return `"${value.replace(/\\/g, "\\\\").replace(/"/g, '\\"')}"`;}if (typeof value === "boolean") {return value.toString();}if (typeof value === "number") {//typeof value === "bigint" 无法序列化，返回'null'//如果参数是 NaN，正无穷大或者负无穷大，会返回falsereturn isFinite(value) ? value.toString() : "null";}if (Array.isArray(value)) {const arrayStr = value.map((item) => stringifyJSON(item)).join(",");//加上[]return `[${arrayStr}]`;}if (typeof value === "object") {//null 类型也是 objectif (value === null) {return "null";}//对象所有keyconst keys = Object.keys(value);const objectStr = keys.map((key) => {//值stringifyJSONconst val = stringifyJSON(value[key]);//重新组合，key加上""return `"${key}":${val}`;}).join(",");//加上{}return `{${objectStr}}`;}//undefined,symbol,bigintreturn "null";}

使用示例

const obj = {name: "小米",money: 2000,isSale: false,type: ["note1", "note2"],address: null,chip:undefined,getMoney: function () {return this.name;},};console.log("obj1", stringifyJSON(obj));//数组,undefined、任意的函数以及symbol值在序列化的过程中会被转换成 null//非数组,undefined、任意的函数以及symbol值在序列化的过程中会被忽略console.log("obj2", JSON.stringify(obj));