3. querystring

    querystring.escape()  ---編碼

    Querystring.unescape()  ---escape的逆運算

    Querystring.parse()  ---解析路徑，物件

    Querystring.stringify() parse的逆運算，物件變成字串

例子：

// 匯入模組
const queryString = require('querystring');
const {URL} = require('url');
// 處理查詢資訊
let urlValue = 'http://www.test.com/search?wd=hello&q=你好世界';
const url = new URL(urlValue);
console.log(url.search);//?wd=hello&q=%E4%BD%A0%E5%A5%BD%E4%B8%96%E7%95%8C
console.log(queryString.escape(url.search));
//%3Fwd%3Dhello%26q%3D%25E4%25BD%25A0%25E5%25A5%25BD%25E4%25B8%2596%25E7%2595%258C
console.log(queryString.unescape('%3Fwd%3Dhello%26q%3D%25E4%25BD%25A0%25E5%25A5%25BD%25E4%25B8%2596%25E7%2595%258C'));
//?wd=hello&q=%E4%BD%A0%E5%A5%BD%E4%B8%96%E7%95%8C
console.log(queryString.parse(url.search));//輸出帶著？號：{ '?wd': 'hello', q: '你好世界' }
 const sp = url.searchParams;
 console.log(sp);//URLSearchParams { 'wd' => 'hello', 'q' => '你好世界' }
 // 獲取sp中的值
 console.log(sp.get('wd'));
 // 遍歷sp資訊
 sp.forEach(function (val,key) {
    console.log(key,val);//wd hello
                        //q 你好世界
});