javascript添加url querystring

 1 //获取url中的参数
 2 getQueryString(pname) {
 3     let reg = new RegExp("(^|&)" + pname + "=([^&]*)(&|$)", 'i'); // 匹配目标参数
 4     let result = window.location.search.substr(1).match(reg); // 对querystring匹配目标参数
 5     if (result != null) {
 6         return decodeURIComponent(result[2]);
 7     } else {
 8         return null;
 9     }
10 },
11 //获取url中的参数
12 setQueryString(pname, pval) {
13     let vurl = window.location.pathname + window.location.search;
14     if(this.getQueryString(pname) != null)
15     {
16         let reg = new RegExp("([?&])" + pname + "=[^&]+", 'i');
17         vurl = vurl.replace(reg, (...pargs)=>{
18             return `${pargs[1]}${pname}=${pval}`;
19         });
20     }
21     else
22     {
23         let vsymbol = '&';
24         if(!window.location.search.length)
25             vsymbol = '?';
26         vurl += `${vsymbol}${pname}=${pval}`;
27     }
28     window.history.replaceState({}, '', vurl);
29 },