vue 頁面保存的值，刷新之后有一個select不顯示之前保存的值，哪里出的問題？

再進入這個界面 select里面的值一直 不顯示 但是接口數(shù)據(jù)顯示已經(jīng)返回了
求教

watch: {
      'form.discountId' (key,old) {
        this.discountschema.map(item => {
          if ( key === item.id){
            this.form.discountName = item.name;
            this.form.discountId = item.name;
          }
        });
      },
    },

return {
        form: {
          id: null,
          name: null,
          rule: [],
          rule1: null,
          rule2: null,
          rule3: null,
          rule4: null,
          discountId:'',
          discountName:'',
          vipPrice: 2,
          discount: 2,
          discount2:2,
          discountValue: null,
          other: ''
        },
        discountschema:[],