過濾對象屬性值為空的屬性

一般接口允許傳參為空的話，就不需要用

      let trans = {
        a:22,
        b:''
      };
      let pam = {}
      for(let i in trans){
        if(trans[i]){
          pam[i] = trans[i]
        }
      }
      console.log(pam);//{a:22}