在Vue中使用键盘事件，回调函数被执行两次

暂时先不考虑v-for的key，查看下面的代码

<template>
  <div>
    <form @submit.prevent="addTask">
    <span>请输入待办事项：</span>
    <input type="text" placeholder="请输入..." v-model="text" @keyup.enter="addTask">
    <button class="btn">确定</button>
    </form>
    <ol>
      <li v-for="(item,index) in arr" :key="index">{{item}} <a href="JavaScript:;" @click="del(index)">删除</a> </li>
    </ol>
  </div>
</template>

<script>
export default {
  name: "HelloWorld",
  data() {
    return {
      arr:[],
      text:''
    };
  },
  methods: {
    addTask(){
      this.arr.push(this.text);
      this.text = '';
      console.log(1);
    },
    del(index){
      this.arr.splice(index,1);
    }
  },
};
</script>

<style scoped>
.btn{
  margin: 0 10px 0 10px;
  vertical-align:middle
}
</style>