watch 同步表单 记得$nextTick，否则不会同步更新到组件内

watch 同步表单 记得$nextTick，否则不会同步更新到组件内

watch: {
    'formData.aaa' (val) {
      this.$nextTick(() => {
        this.formData.aaa= val.trim()
      })
    },