最近用vue3 + js 写了聊天机器人页面 总结了几个问题

实现的功能 : 发送消息后会显示时间、可复制、可删除 ；
                     输入框内容太多时会固定在一个高度内 ，有滚动条方便编辑查看 ； 
                     输入框一键清空；
                     发送多条信息后 ， 视角会自动跳转到最后一条信息 ，不必再手动滑动

最终效果如下



----------------------------------------------------------------------------------------------

问题1 : 输入框内容太多时 , 没有固定一个高度 , 还会遮挡已有的信息

    <div class="chat-input">
          <el-input
            v-model="input"
            @keyup.enter.prevent="sendMessage"
            placeholder="试着输入点什么..."
            class="input"
            type="textarea"
            :rows="3"
            autosize
            :style="{ maxHeight: '100px', overflowY: 'auto' }"  //加上这部分可解决问题
          >
          </el-input>

          <div class="clear" @click="clearInput">
            <img src="../../assets/image/清空.png" alt="" />
            <div class="text">清空输入框</div>
          </div>

          <el-button
            class="button"
            type="primary"
            @click="sendMessage"
            :icon="Position"
            >发送</el-button
          >
        </div>

问题2 : 回车键有抖动效果

   <div class="chat-input">
          <el-input
            v-model="input"
            @keyup.enter.prevent="sendMessage"  //改为@keydown,@keyup和enter可能会冲突
            placeholder="试着输入点什么..."
            class="input"
            type="textarea"
            :rows="3"
            autosize
            :style="{ maxHeight: '100px', overflowY: 'auto' }"
          >
          </el-input>

          <div class="clear" @click="clearInput">
            <img src="../../assets/image/清空.png" alt="" />
            <div class="text">清空输入框</div>
          </div>

          <el-button
            class="button"
            type="primary"
            @click="sendMessage"
            :icon="Position"
            >发送</el-button
          >
        </div>

问题3 : 发送消息后不能跳到指定位置

     <el-scrollbar height="660px">
          <div class="chat">
            <div class="chat-messages">
              <div
                v-for="(item, index) in messages"
                :key="item.id"
                class="message"
              >
                <div class="content">{{ item.text }}</div>
                <div class="date">{{ formatTimestamp(item.timestamp) }}</div>
                <div class="delate" @click="delateMsg(index)">
                  <img src="../../assets/image/删除.png" alt="" />
                  <div class="text">删除</div>
                </div>
                <div class="copy" @click="copyMsg(index)">
                  <img src="../../assets/image/复制.png" alt="" />
                  <div class="text">复制</div>
                </div>
              </div>
            </div>
          </div>
        </el-scrollbar>      
       <div class="chat-input">
          <el-input
            v-model="input"
            @keyup.enter.prevent="sendMessage"
            placeholder="试着输入点什么..."
            class="input"
            type="textarea"
            :rows="3"
            autosize
            :style="{ maxHeight: '100px', overflowY: 'auto' }"
          >
          </el-input>

          <div class="clear" @click="clearInput">
            <img src="../../assets/image/清空.png" alt="" />
            <div class="text">清空输入框</div>
          </div>

          <el-button
            class="button"
            type="primary"
            @click="sendMessage"
            :icon="Position"
            >发送</el-button
          >
        </div>


<script setup>

import { ref, nextTick } from 'vue'
const messages = ref([])
const input = ref('')
const text = ref('')


const sendMessage = async () => {       //声明异步函数，为方便下面使用await nextTick()
  if (input.value.trim() !== '') {
    messages.value.push({
      id: Date.now(),
      text: input.value,
      timestamp: new Date()
    })

    input.value = ''

    await nextTick() // 等待DOM更新完成
 
    const messageElements = document.getElementsByClassName('message')   
    const lastMessageElement = messageElements[messageElements.length - 1]  // 找到最后一个信息类名
    lastMessageElement.scrollIntoView({ behavior: 'smooth', block: 'end' }) // 平滑的跳转到最后一个信息
  }
}

完整代码如下

<template>
  <div class="deploy">
    <div class="cardTop">开始聊天吧</div>
    <el-card class="elCard">
      <div class="left">
        <ul class="leftUl">
          <li class="leftLi">
            <div class="circle">
              <img src="../../assets/image/圆圈.svg" alt="" />
            </div>
          </li>
          <li class="leftLi2">
            <div class="circle">
              <img src="../../assets/image/圆圈.svg" alt="" />
            </div>
          </li>
        </ul>
        <div class="robot">
          <img src="../../assets/image/机器人.png" alt="" />
          <img src="../../assets/image/信息2.png" alt="" />
        </div>
      </div>
      <div class="right">
        <el-scrollbar height="660px">
          <div class="chat">
            <div class="chat-messages">
              <div
                v-for="(item, index) in messages"
                :key="item.id"
                class="message"
              >
                <div class="content">{{ item.text }}</div>
                <div class="date">{{ formatTimestamp(item.timestamp) }}</div>
                <div class="delate" @click="delateMsg(index)">
                  <img src="../../assets/image/删除.png" alt="" />
                  <div class="text">删除</div>
                </div>
                <div class="copy" @click="copyMsg(index)">
                  <img src="../../assets/image/复制.png" alt="" />
                  <div class="text">复制</div>
                </div>
              </div>
            </div>
          </div>
        </el-scrollbar>
        <div class="chat-input">
          <el-input
            v-model="input"
            @keydown.enter.prevent="sendMessage"
            placeholder="试着输入点什么..."
            class="input"
            type="textarea"
            :rows="3"
            autosize
            :style="{ maxHeight: '100px', overflowY: 'auto' }"
          >
          </el-input>

          <div class="clear" @click="clearInput">
            <img src="../../assets/image/清空.png" alt="" />
            <div class="text">清空输入框</div>
          </div>

          <el-button
            class="button"
            type="primary"
            @click="sendMessage"
            :icon="Position"
            >发送</el-button
          >
        </div>
      </div>
    </el-card>
  </div>
</template>

<script setup>
import {
  ElButton,
  ElScrollbar,
  ElInput,
  ElCard,
  ElMessageBox,
  ElMessage
} from 'element-plus'
import { Position } from '@element-plus/icons-vue'
import { ref, nextTick } from 'vue'
const messages = ref([])
const input = ref('')
const text = ref('')

const sendMessage = async () => {
  if (input.value.trim() !== '') {
    messages.value.push({
      id: Date.now(),
      text: input.value,
      timestamp: new Date()
    })

    input.value = ''

    await nextTick() // 等待DOM更新完成

    const messageElements = document.getElementsByClassName('message')
    const lastMessageElement = messageElements[messageElements.length - 1]
    lastMessageElement.scrollIntoView({ behavior: 'smooth', block: 'end' })
  }
}

const clearInput = () => {
  input.value = ''
}

const formatTimestamp = timestamp => {
  const options = {
    year: 'numeric',
    month: 'numeric',
    day: 'numeric',
    hour: 'numeric',
    minute: 'numeric',
    second: 'numeric'
  }
  return new Intl.DateTimeFormat('default', options).format(timestamp)
}

const copyMsg = index => {
  const text = messages.value[index].text
  const textarea = document.createElement('textarea')
  textarea.value = text
  document.body.appendChild(textarea)
  textarea.select()
  document.execCommand('copy')
  document.body.removeChild(textarea)
  ElMessage({
    type: 'success',
    message: '复制成功'
  })
}

const delateMsg = index => {
  ElMessageBox.confirm(`是否删除此数据吗?`, '警告', {
    confirmButtonText: '确定',
    cancelButtonText: '取消',
    type: 'warning'
  })
    .then(() => {
      messages.value.splice(index, 1)
      ElMessage({
        type: 'success',
        message: '删除成功'
      })
    })
    .catch(() => {})
}
</script>

<style lang="less" scoped>
.deploy {
  padding: 20px 60px 0 60px;

  .cardTop {
    margin-bottom: 20px;
    color: #27264d;
    font-size: 32px;
    opacity: 0.85;
    display: flex;
  }
  .elCard {
    height: 800px;
    .left {
      width: 300px;
      margin-right: 70px;
      flex: 0;
      display: flex;
      .leftUl {
        img {
          width: 20px;
          height: 20px;
        }
        .leftLi {
          display: flex;
          .circle {
            position: relative;
          }
          .circle::after {
            content: '';
            position: absolute;
            top: 60%;
            left: 50%;
            transform: translate(-50%, 0);
            width: 2px;
            height: 740px;
            background-color: #75b7ff;
          }
        }
        .leftLi2 {
          display: flex;
          margin-top: 720px;
        }
      }
      .robot {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        img {
          width: 40px;
          height: 40px;
        }
      }
    }
    .right {
      flex: 1;
      padding: 0 30px;
      border: 2px solid #ccc;
      border-radius: 7px;
      position: relative;
      .chat {
        height: 660px;
        padding: 10px;
        display: flex;
        flex-direction: column;

        .chat-messages {
          flex: 1;
          margin-right: 200px;

          .message {
            display: flex;
            flex-direction: column;
            margin-top: 50px;
            position: relative;

            .content {
              height: 200px;
              background: #f4f6f8;
              display: flex;
              padding: 2px 0 0 5px;
              border: 1px solid #ccc;
              word-wrap: break-word;
            }
            .date {
              position: absolute;
              align-self: flex-start;
              top: -20px;
              color: #ccc;
            }
            .delate {
              position: absolute;
              align-self: flex-end;
              bottom: 0px;
              right: -60px;
              display: flex;
              align-items: center;
              img {
                width: 20px;
                height: 20px;
              }
              .text {
                color: #1296db;
                opacity: 0;
                padding-left: 5px;
              }
            }
            .delate:hover {
              cursor: pointer;
            }
            .delate:hover .text {
              opacity: 1;
            }
            .copy {
              position: absolute;
              align-self: flex-end;
              bottom: 30px;
              right: -60px;
              display: flex;
              align-items: center;
              img {
                width: 20px;
                height: 20px;
              }
              .text {
                color: #1296db;
                opacity: 0;
                padding-left: 5px;
              }
            }
            .copy:hover {
              cursor: pointer;
            }
            .copy:hover .text {
              opacity: 1;
            }
          }
        }
      }
      .chat-input {
        display: flex;
        align-items: center;
        z-index: 1000;
        position: absolute;
        bottom: 10px;
        width: 95%;
        .input {
          margin-right: 10px;
        }
        .clear {
          width: 20px;
          height: 50px;
          display: flex;
          margin-left: 5px;
          justify-content: center;
          align-items: center;
          img {
            width: 20px;
            height: 20px;
          }

          .text {
            font-size: 12px;
            color: #1296db;
            margin-left: 5px;
            opacity: 0;
          }
        }

        .clear:hover {
          cursor: pointer;
          width: 100px;
        }

        .clear:hover .text {
          opacity: 1;
          margin-right: 15px;
        }

        .button {
          padding: 15px;
        }
      }
    }
  }

  :deep(.el-card__body) {
    display: flex;
    width: 100%;
  }
  :deep(.el-input__inner) {
    white-space: pre-wrap;
    word-break: break-all;
    height: 30px;
  }
}
</style>

拓 : 上述聊天机器人不够完美
完美效果如下 : 自己发送数据后 , 系统有返回 , 还可以删除系统或自己问题

完美版的代码如下

<template>
  <div class="right">
    <el-scrollbar height="400px">
      <!-- 所有的回复 -->
      <div class="allReply" v-for="(item, index) in messages" :key="item.id">
        <!-- 右侧自己的回复 -->
        <div class="chat2" v-if="!item.deleted2">
          <div class="chat-messages2">
            <div class="message">
              <div class="content">{{ item.text }}</div>
              <div class="date">
                {{ formatTimestamp(item.timestamp) }}
              </div>
              <div class="delate2" @click="delateMsg(index, 'self')">
                <div class="text">删除</div>

                <img src="../../assets/image/删除.png" alt="" />
              </div>
              <div class="copy2" @click="copyMsg(index)">
                <div class="text">复制</div>
                <img src="../../assets/image/复制.png" alt="" />
              </div>
            </div>
          </div>
        </div>

        <!-- 左侧系统的回复 -->
        <div class="chat" v-if="!item.deleted">
          <img
            src="../../assets/image/gpt.png"
            alt=""
            srcset=""
            class="chatgptLogo"
            v-if="isGptShow"
          />
          <div class="chat-messages">
            <div class="message">
              <div class="content">{{ item.textSystem }}</div>
              <div class="date">
                {{ formatTimestamp(item.timestamp) }}
              </div>
              <div class="delate" @click="delateMsg(index, 'system')">
                <img src="../../assets/image/删除.png" alt="" />
                <div class="text">删除</div>
              </div>
              <div class="copy" @click="copyMsg(index)">
                <img src="../../assets/image/复制.png" alt="" />
                <div class="text">复制</div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </el-scrollbar>

    <div class="chat-input">
      <el-input
        v-model="input"
        @keydown.enter.prevent="sendMessage"
        placeholder="试着输入点什么..."
        class="input"
        type="textarea"
        :rows="3"
        autosize
        :style="{ maxHeight: '90px', overflowY: 'auto' }"
      >
      </el-input>

      <div class="clear" @click="clearInput">
        <img src="../../assets/image/清空.png" alt="" />
        <div class="text">清空输入框</div>
      </div>

      <el-button
        class="button"
        type="primary"
        @click="sendMessage"
        :icon="Position"
        >发送</el-button
      >
    </div>
  </div>
</template>

<script setup>
import {
  ElButton,
  ElScrollbar,
  ElInput,
  ElMessageBox,
  ElMessage
} from 'element-plus'
import { Position } from '@element-plus/icons-vue'
import { ref, nextTick } from 'vue'

const messages = ref([]) //总回复

const input = ref('')
const text = ref('')
const isGptShow = ref(false)

const sendMessage = async () => {
  isGptShow.value = true
  if (input.value.trim() !== '') {
    const newMessage = {
      id: Date.now(),
      text: input.value,
      textSystem: '我是系统回复...',
      timestamp: new Date()
    }

    messages.value.push(newMessage)

    input.value = ''

    await nextTick() // 等待DOM更新完成  非常重要

    const messageElements = document.getElementsByClassName('message')
    const lastMessageElement = messageElements[messageElements.length - 1]
    lastMessageElement.scrollIntoView({ behavior: 'smooth', block: 'end' })
  }
}

const clearInput = () => {
  input.value = ''
}

const formatTimestamp = timestamp => {
  const options = {
    year: 'numeric',
    month: 'numeric',
    day: 'numeric',
    hour: 'numeric',
    minute: 'numeric',
    second: 'numeric'
  }
  return new Intl.DateTimeFormat('default', options).format(timestamp)
}

const copyMsg = index => {
  const text = messages1.value[index].text
  const textarea = document.createElement('textarea')
  textarea.value = text
  document.body.appendChild(textarea)
  textarea.select()
  document.execCommand('copy')
  document.body.removeChild(textarea)
  ElMessage({
    type: 'success',
    message: '复制成功'
  })
}

const delateMsg = (index, type) => {
  ElMessageBox.confirm(`是否删除此数据吗?`, '警告', {
    confirmButtonText: '确定',
    cancelButtonText: '取消',
    type: 'warning'
  })
    .then(() => {
      // messages.value.splice(index, 1)

      if (type === 'system') {
        const message = messages.value[index]
        delete message.textSystem
        message.deleted = true // 标记消息为已删除
  
      } else if (type === 'self') {
        const message = messages.value[index]
        delete message.text
        message.deleted2 = true // 标记消息为已删除
      }

      ElMessage({
        type: 'success',
        message: '删除成功'
      })
    })
    .catch(() => {})
}
</script>

<style lang="less" scoped>
.cardTop {
  margin-bottom: 20px;
  color: #27264d;
  font-size: 32px;
  opacity: 0.85;
  display: flex;
}
.elCard {
  height: 800px;
  .right {
    flex: 1;
    padding: 0 30px;
    position: relative;
    height: 500px;

    // 公共区域
    .message {
      display: flex;
      flex-direction: column;
      margin-top: 50px;
      position: relative;

      .content {
        height: 200px;
        background: #f4f6f8;
        display: flex;
        padding: 7px 0 0 10px;
        border: 1px solid #ccc;
        border-radius: 7px;
        word-wrap: break-word;
        flex-wrap: wrap;
      }
      .date {
        position: absolute;
        align-self: flex-start;
        bottom: -20px;
        right: 0;
        color: #ccc;
        font-size: 14px;
      }
      .delate {
        position: absolute;
        align-self: flex-end;
        bottom: 0px;
        right: -60px;
        display: flex;
        align-items: center;
        img {
          width: 20px;
          height: 20px;
        }
        .text {
          color: #1296db;
          opacity: 0;
          padding-left: 5px;
        }
      }
      .delate:hover {
        cursor: pointer;
      }
      .delate:hover .text {
        opacity: 1;
      }
      .copy {
        position: absolute;
        align-self: flex-end;
        bottom: 30px;
        right: -60px;
        display: flex;
        align-items: center;
        img {
          width: 20px;
          height: 20px;
        }
        .text {
          color: #1296db;
          opacity: 0;
          padding-left: 5px;
        }
      }
      .copy:hover {
        cursor: pointer;
      }
      .copy:hover .text {
        opacity: 1;
      }
    }

    // 左侧系统的输出
    .chat {
      padding: 10px;
      display: flex;
      flex-direction: column;
      position: relative;
      .chatgptLogo {
        width: 20px;
        height: 20px;
        position: absolute;
        top: 30px;
      }

      .chat-messages {
        flex: 1;
        margin-right: 200px;
        height: 400px;
      }
    }

    // 右侧自己的输出
    .chat2 {
      padding: 10px;
      display: flex;
      flex-direction: column;

      .chat-messages2 {
        flex: 1;
        margin-left: 200px;
        height: 400px;

        .delate2 {
          position: absolute;
          align-self: flex-end;
          bottom: 0px;
          left: -60px;
          display: flex;
          align-items: center;
          img {
            width: 20px;
            height: 20px;
          }
          .text {
            color: #1296db;
            opacity: 0;
            padding-left: 5px;
          }
        }
        .delate2:hover {
          cursor: pointer;
        }
        .delate2:hover .text {
          opacity: 1;
        }
        .copy2 {
          position: absolute;
          align-self: flex-end;
          bottom: 30px;
          left: -60px;
          display: flex;
          align-items: center;
          img {
            width: 20px;
            height: 20px;
          }
          .text {
            color: #1296db;
            opacity: 0;
            padding-left: 5px;
          }
        }
        .copy2:hover {
          cursor: pointer;
        }
        .copy2:hover .text {
          opacity: 1;
        }
      }
    }

    // 输入框区域
    .chat-input {
      display: flex;
      align-items: center;
      z-index: 1000;
      position: absolute;
      bottom: 10px;
      width: 95%;
      .input {
        margin-right: 10px;
        // border-top: 1px solid #ccc;
      }
      .clear {
        width: 20px;
        height: 50px;
        display: flex;
        margin-left: 5px;
        justify-content: center;
        align-items: center;
        img {
          width: 20px;
          height: 20px;
        }

        .text {
          font-size: 12px;
          color: #1296db;
          margin-left: 5px;
          opacity: 0;
        }
      }

      .clear:hover {
        cursor: pointer;
        width: 100px;
      }

      .clear:hover .text {
        opacity: 1;
        margin-right: 15px;
      }

      .button {
        padding: 15px;
      }
    }
  }
  :deep(.el-card__body) {
    display: flex;
    width: 100%;
  }
  :deep(.el-input__inner) {
    white-space: pre-wrap;
    word-break: break-all;
    height: 27px;
  }
}
</style>