将对象转换成 url 字符串的方法

   urlEncode(param, key, encode, ignoreKey = []) {
      if(param==null) return '';
      var paramStr = '';
      var t = typeof (param);
      if (t == 'string' || t == 'number' || t == 'boolean') {
        paramStr += '&' + key + '=' + ((encode==null||encode) ? encodeURIComponent(param) : param);
      } else {
        for (var i in param) {
          if(ignoreKey.includes(i)){
            continue;
          }
          var k = key == null ? i : key + (param instanceof Array ? '[' + i + ']' : '.' + i);
          paramStr += this.urlEncode(param[i], k, encode);
        }
      }
      return paramStr;
    }