vue编码之优化手段

<template>
  <div id="app">
    <input
      type="text"
      placeholder="今天的任务完成了吗？"
      v-model="message"
      @change="addContent"
    />
    <button @click="shuffle">随机排序</button>
    <transition-group name="nums" tag="ul" class="box">
      <li v-for="(item, i) in likeList" :key="item" class="task">
        <span>{{ item }}</span>
        <button @click="deleteContent(i)">完成</button>
      </li>
    </transition-group>
  </div>
</template>

<script>
export default {
  data() {
    return {
      likeList: ["写代码", "看书", "吃饭", "追女孩子"],
      message: "",
    };
  },
  methods: {
    deleteContent(i) {
      this.likeList.splice(i, 1);
    },
    shuffle() {
      this.likeList.sort(() => Math.random() - 0.5);
    },
    addContent() {
      if (this.likeList.includes(this.message.replace(/\s+/g, ""))) {
        alert("当前任务已存在，请重新输入！");
        this.message = "";
        return;
      }
      this.likeList.unshift(this.message.replace(/\s+/g, ""));
      this.message = "";
    },
  },
};
</script>

<style>
#app {
  width: 500px;
  margin: 0 auto;
}
* {
  list-style: none;
}
input {
  width: 600px;
  height: 40px;
  font-size: 24px;
  border: none;
  outline: none;
  border-style: solid;
  border-color: #ddd;
  background: paleturquoise;
  margin-bottom: 15px;
  text-indent: 1em;
}
.box {
  width: 500px;
  padding: 0 20px;
  margin-bottom: 200px;
}
.task {
  width: 100%;
  height: 50px;
  line-height: 50px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #ddd;
}
.task button {
  width: 70px;
  height: 30px;
}
.nums-enter {
  opacity: 0;
  transform: translateX(-300px);
}
.nums-enter-active,
.nums-leave-active,
.nums-move {
  /* 修改这里的时间即可 */
  transition: 5s;
}
.nums-leave-to {
  opacity: 0;
  transform: translateX(300px);
}
.nums-leave-active {
  position: absolute;
}
</style>