el-input-number 点击加减只能加一次

<el-input-number v-model="editForm.quantity" placeholder="请输入下单数量(店均)" @change="quantityChangeFn"></el-input-number>

需要在方法里面加 this.$forceUpdate()

    quantityChangeFn(val) {
      this.$forceUpdate()
      this.editForm.quantity = val
    },