Two silly moments when I develop using Vue.js

  1. Bound object changes but the UI didn't change. Solution:

Template part,

<el-select v-model="form.categoryIdList" multiple @change="setValue(form.categoryIdList)">

Component part,

    setValue(object) {
      this.$set(this.form, this.form.categoryIdList, object)
    },
  1. VUE_APP_CUSTOM_VARIBLE doesn't work, solution:

Restart your dev server.