Delete a parameter of the url address string

For example, delete the token parameter of url
Before deletion: http://xxxxxxxx/#/dynamic?token=4654561654asd4asd&id=03e657722d5056820c5f&cityName=Guangzhou City
After deletion: http://xxxxxxxx/#/dynamic?id=03e657722d5056820c5f&cityName=Guangzhou City

/**
     * 删除URL中指定search参数,会将参数值一起删除
     * @param {string} url 地址字符串
     * @param {array} param 要删除的参数key数组，如['name','age']
     * @return {string} 返回新URL字符串
     */
    ridUrlParam(url, params) {
    
    
      for (var index = 0; index < params.length; index++) {
    
    
        var item = params[index];
        //必须加=号，避免参数值中包含item字符串
        var fromIndex = url.indexOf(item + "="); 
        if (fromIndex !== -1) {
    
    
          // 通过url特殊符号，计算出=号后面的的字符数，用于生成replace正则
          var startIndex = url.indexOf("=", fromIndex);
          var endIndex = url.indexOf("&", fromIndex);
          var hashIndex = url.indexOf("#", fromIndex);
    
          var reg = "";
          if (endIndex !== -1) {
    
    
            // 后面还有search参数的情况
            var num = endIndex - startIndex;
            reg = new RegExp(item + "=.{" + num + "}");
            url = url.replace(reg, "");
          } else if (hashIndex !== -1) {
    
    
            // 有hash参数的情况
            var num = hashIndex - startIndex - 1;
            reg = new RegExp("&?" + item + "=.{" + num + "}");
            url = url.replace(reg, "");
          } else {
    
    
            // search参数在最后或只有一个参数的情况
            reg = new RegExp("&?" + item + "=.+");
            url = url.replace(reg, "");
          }
        }
      }
      var noSearchParam = url.indexOf("=");
      if (noSearchParam === -1) {
    
    
        // 如果已经没有参数，删除？号
        url = url.replace(/\?/, ""); 
      }
      return url;
    }