vue如何实现前端列表多条件筛选

filterForm:{
 schoolName:'',//输入的学校名称
 position:'',//选择的区域区域
 schoolLevel:"",//选择的学校办别
},
schoolList:[
 {schoolName:'青岛市实验高级中学',schoolLevel:"",position:'山东省青岛市城阳区硕阳路69号'},
 {schoolName:'山东省青岛第二中学',schoolLevel:"",position:'山东省青岛市崂山区松岭路70号'},
 {schoolName:'山东省青岛第一中学',schoolLevel:"",position:'山东省青岛市市南区单县路46号'},
 {schoolName:'山东省青岛第三十九中学',schoolLevel:"",position:'市南区登州路5号'},
 {schoolName:'山东省青岛第六中学',schoolLevel:"",position:'山东省青岛市黄岛区云台山路66号'},
 {schoolName:'山东省青岛第十九中学',schoolLevel:"",position:'山东省青岛市即墨区鳌山卫街道卫场路69号'},
 {schoolName:'青岛艺术学校',schoolLevel:"",position:'青岛市李沧区九水路176号'},
 {schoolName:'山东省青岛第九中学',schoolLevel:"",position:'山东省青岛市黄岛区七星河路559号'},
 {schoolName:'青岛电子学校',schoolLevel:"",position:'山东省青岛市市北区台东一路118号'}
],//其中schoolList是元数据
resull:[]//搜索结果，也是列表循环的数据

watch: {
 // 监听对象变化
 filterForm:{
 handler(val, oldVal){
  if(val){
  // 如果筛选条件全为空，查全部；否则按条件筛选
  var objIsEmpty = this.filterForm.schoolName == '' && this.filterForm.schoolLevel == '' && this.filterForm.position == ''
  if(objIsEmpty){
   this.result = this.schoolList
  } else {
   // /拿到有值的参数
   let tempFilter = {};
   for(var key in this.filterForm) {
   if(typeof(this.filterForm[key]) != "undefined" && typeof(this.filterForm[key]) != "null" && this.filterForm[key] != null && this.filterForm[key] != "") {
    tempFilter[key] = this.filterForm[key];
   }
   }
   // console.log(tempFilter,'输出tempFilter')
   this.result = this.schoolList.filter(
   //筛选
   (item) => {
    let flag = false;
    for(key in tempFilter) {
    console.log(key,'输出key')
     if(item[key].toString().indexOf(tempFilter[key].toString()) >= 0) {
     flag = true;
     } else {
                    flag = false;
                    break;
                  }
                }
                if(flag) {
                  return item;
                }
              }
            );
            console.log(this.result,'输出筛选结果')
          }
        }
      },
      deep:true
    }
}