解释代码const state = reactive({ inputText: "", isKeyboardVisible: false, messages: [ { content: "施主你好，很高兴为您服务！", msg: { time:"" } }, ], sendMessage: () => { const content = state.inputText.trim(); if (content) { const time = new Date(); const message = { id: state.messages.length + 1, content, time, isUser: true, avatar:'1' }; state.messages.push(message); state.inputText = ""; state.replyMessage(); } }, replyMessage: () => { const content = "尊敬的施主，您好。我们已收到您的咨询，请稍后。"; const time = new Date(); const message = { id: state.messages.length + 1, content, time, isUser: false, avatar:'2' }; setTimeout(() => { state.messages.push(message); }, 1000); }, formatDate: (time) => { const date = time?new Date(time):new Date(); const hours = date.getHours().toString().padStart(2, "0"); const minutes = date.getMinutes().toString().padStart(2, "0"); return `${hours}:${minutes}`; }, showKeyboard() { state.isKeyboardVisible = true; document.querySelector("input").focus(); }, hideKeyboard() { state.isKeyboardVisible = false; document.activeElement.focus(); }, });

这段代码使用了 Vue 3 中的响应式 API，创建了一个名为 state 的对象，包含了一些属性和方法：

- inputText: 输入框中的文本内容；
- isKeyboardVisible: 是否显示虚拟键盘；
- messages: 聊天记录，初始值为一条欢迎消息；
- sendMessage: 发送消息的方法，会将输入框中的文本内容作为一条用户消息加入聊天记录中，并调用 replyMessage 方法生成一条机器人回复消息；
- replyMessage: 生成机器人回复消息的方法，会在 1 秒后将一条默认回复消息加入聊天记录中；
- formatDate: 将时间戳格式化为 hh:mm 的方法；
- showKeyboard: 显示虚拟键盘的方法，将 isKeyboardVisible 设为 true 并使输入框获得焦点；
- hideKeyboard: 隐藏虚拟键盘的方法，将 isKeyboardVisible 设为 false 并使输入框失去焦点。

这段代码的作用是创建一个简单的聊天界面，用户可以在输入框中输入消息，机器人会自动回复默认消息，并将聊天记录显示在界面上。其中使用了 Vue 3 的响应式 API，可以方便地更新界面上的数据。

相关问题

<script setup> import useGetUrl from "@/hooks/useGetUrl"; import { reactive ,onMounted} from "vue"; const state = reactive({ inputText: "", isKeyboardVisible: false, messages: [ { content: "施主你好，很高兴为您服务！", msg: { time:"" } }, ], sendMessage: () => { const content = state.inputText.trim(); if (content) { const time = new Date(); const message = { id: state.messages.length + 1, content, time, isUser: true, }; state.messages.push(message); state.inputText = ""; state.replyMessage(); } }, replyMessage: () => { const content = "尊敬的施主，您好。我们已收到您的咨询，请稍后。"; const time = new Date(); const message = { id: state.messages.length + 1, content, time, isUser: false, }; setTimeout(() => { state.messages.push(message); }, 1000); }, formatDate: (time) => { const date = time?new Date(time):new Date(); const hours = date.getHours().toString().padStart(2, "0"); const minutes = date.getMinutes().toString().padStart(2, "0"); return ${hours}:${minutes}; }, showKeyboard() { state.isKeyboardVisible = true; document.querySelector("input").focus(); }, hideKeyboard() { state.isKeyboardVisible = false; document.activeElement.focus(); }, // handleScroll() { // const chatList = this.$refs.chatList; // const scrollTop = chatList.scrollTop; // const scrollHeight = chatList.scrollHeight; // const clientHeight = chatList.clientHeight; // if (scrollTop === 0) { // // 聊天列表滚动到了顶部，需要加载更多聊天记录 // // TODO: 加载更多聊天记录 // // 滚动到之前的位置，避免列表跳动 // chatList.scrollTop = chatList.scrollHeight - scrollHeight; // } else if (scrollTop + clientHeight >= scrollHeight) { // // 聊天列表滚动到了底部，需要将列表自动上滑 // chatList.scrollTop = chatList.scrollHeight - clientHeight; // } // }, }); onMounted(() => { state.messages[0].msg.time = state.formatDate() }) </script>在该段代码中增加列表置底后上滑

可以在聊天列表上添加一个ref属性，用于获取聊天列表的dom节点，然后在sendMessage和replyMessage方法中，将聊天列表的scrollTop设置为聊天列表的scrollHeight，实现自动置底。在handleScroll方法中，可以判断scrollTop是否为0，如果为0则说明聊天列表已经滚动到了顶部，可以加载更多聊天记录；如果scrollTop加上clientHeight大于等于scrollHeight，则说明聊天列表已经滚动到了底部，需要将列表自动上滑。以下是修改后的代码：

<template>
  <div class="chat-container">
    <div class="chat-header">在线客服</div>
    <div class="chat-list" ref="chatList">
      <div class="chat-message" v-for="message in state.messages" :key="message.id">
        <div class="chat-content" :class="{'user': message.isUser}">
          <div class="chat-text">{{ message.content }}</div>
          <div class="chat-time">{{ state.formatDate(message.time) }}</div>
        </div>
      </div>
    </div>
    <div class="chat-input">
      <div class="chat-input-box" :class="{'show-keyboard': state.isKeyboardVisible}">
        <input type="text" v-model="state.inputText" placeholder="请输入您的问题" />
        <div class="chat-input-btn" @click="state.sendMessage">发送</div>
        <div class="chat-input-keyboard" @click="state.showKeyboard">键盘</div>
        <div class="chat-input-voice">语音</div>
      </div>
      <div class="chat-input-keyboard-box" v-show="state.isKeyboardVisible">
        <div class="chat-input-keyboard-item" v-for="(item, index) in state.keyboard" :key="index" @click="state.inputText += item">{{ item }}</div>
        <div class="chat-input-keyboard-item" @click="state.inputText = state.inputText.slice(0, -1)">删除</div>
        <div class="chat-input-keyboard-item" @click="state.hideKeyboard">收起</div>
      </div>
    </div>
  </div>
</template>

<script setup>
import { reactive, onMounted } from "vue";
import useGetUrl from "@/hooks/useGetUrl";

const state = reactive({
  inputText: "",
  isKeyboardVisible: false,
  messages: [
    {
      content: "施主你好，很高兴为您服务！",
      time: new Date(),
      isUser: false,
    },
  ],
  keyboard: ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"],
  sendMessage: () => {
    const content = state.inputText.trim();
    if (content) {
      const time = new Date();
      const message = {
        id: state.messages.length + 1,
        content,
        time,
        isUser: true,
      };
      state.messages.push(message);
      state.inputText = "";
      state.replyMessage();
      state.scrollToBottom();
    }
  },
  replyMessage: () => {
    const content = "尊敬的施主，您好。我们已收到您的咨询，请稍后。";
    const time = new Date();
    const message = {
      id: state.messages.length + 1,
      content,
      time,
      isUser: false,
    };
    setTimeout(() => {
      state.messages.push(message);
      state.scrollToBottom();
    }, 1000);
  },
  formatDate: (time) => {
    const date = time ? new Date(time) : new Date();
    const hours = date.getHours().toString().padStart(2, "0");
    const minutes = date.getMinutes().toString().padStart(2, "0");
    return `${hours}:${minutes}`;
  },
  showKeyboard() {
    state.isKeyboardVisible = true;
    document.querySelector("input").focus();
  },
  hideKeyboard() {
    state.isKeyboardVisible = false;
    document.activeElement.focus();
  },
  scrollToBottom() {
    const chatList = this.$refs.chatList;
    chatList.scrollTop = chatList.scrollHeight;
  },
});

onMounted(() => {
  state.messages[0].time = state.formatDate();
});
</script>

<style scoped>
.chat-container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.chat-header {
  height: 40px;
  line-height: 40px;
  background-color: #f5f5f5;
  text-align: center;
}

.chat-list {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
}

.chat-message {
  margin-bottom: 10px;
}

.chat-content {
  display: inline-block;
  padding: 5px 10px;
  border-radius: 10px;
  max-width: 80%;
  word-wrap: break-word;
}

.chat-content.user {
  text-align: right;
  background-color: #e6f7ff;
}

.chat-content.user .chat-text {
  display: inline-block;
  text-align: left;
}

.chat-content:not(.user) {
  text-align: left;
  background-color: #fff;
}

.chat-time {
  font-size: 12px;
  color: #999;
  text-align: right;
  margin-top: 5px;
}

.chat-input {
  height: 50px;
  border-top: 1px solid #ddd;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.chat-input-box {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  bottom: 0;
  left: 0;
  padding: 5px;
}

.chat-input-btn {
  background-color: #409eff;
  color: #fff;
  padding: 5px 10px;
  border-radius: 5px;
  margin-left: 10px;
  cursor: pointer;
}

.chat-input-keyboard {
  font-size: 20px;
  margin-left: 10px;
  cursor: pointer;
}

.chat-input-voice {
  font-size: 20px;
  margin-left: 10px;
  cursor: pointer;
}

.chat-input-keyboard-box {
  width: 100%;
  display: none;
  position: absolute;
  bottom: 50px;
  left: 0;
  background-color: #fff;
  border-top: 1px solid #ddd;
}

.chat-input-keyboard-box.show {
  display: block;
}

.chat-input-keyboard-item {
  display: inline-block;
  width: calc(100% / 3);
  height: 40px;
  line-height: 40px;
  text-align: center;
  cursor: pointer;
}

.chat-input-keyboard-item:nth-child(10) {
  width: calc(100% / 3 * 2);
}

.show-keyboard .chat-input-keyboard-box {
  display: block;
}
</style>