【vue】生命周期函数

一、页面样式：
（1）点击前：

（2）点击后：

设计：①自定义elementPlus图标；②使用Tooltip实现鼠标悬浮按钮上出现文字提示；③上传与更换的切换样式；
前端：通过chooseVideo与chooseVideoFile这两个方法，分别去①限制点击上传的文件类型；②获取到上传的文件this.fileInfo.selectedFile与this.fileInfo.selectedVideoFile传给后端进一步处理；③通过拿到的文件直接可以fileInfo.selectedFile.name获取到文件名；

二、前端代码

<el-dialog v-model="addVideoFile" :before-close="closeDialog" title="新增视频"  width="800px">
      <el-form :model="fileInfo" label-position="left" label-width="100px">
      <el-form-item label="视频：">
                    <span v-if="fileInfo.selectedFile" style="margin-right: 5px;color: black">{{
                        fileInfo.selectedFile.name
                      }}</span>
          <el-button type="primary" @click="chooseVideo">
            {{ fileInfo.selectedFile ? "更换视频" : "上传视频" }}<el-icon class="el-icon--right"><UploadFilled /></el-icon>
          </el-button>
        </el-form-item>
        <el-form-item label="压缩包：">
            <span v-if="fileInfo.selectedVideoFile" style="margin-right: 5px;color: black">{{
                fileInfo.selectedVideoFile.name
              }}</span>
          <el-tooltip content="支持word/excel/pdf/zip/exe/md/rar/mp4/txt文件" placement="bottom" effect="light">
            <el-button type="primary" @click="chooseVideoFile">{{ fileInfo.selectedVideoFile ? "更换压缩包" : "上传压缩包" }}<el-icon class="el-icon--right"><Briefcase /></el-icon></el-button>
          </el-tooltip>
        </el-form-item>
      </el-form>
      <template #footer>
        <span class="dialog-footer">
          <el-button @click="addVideoFile = false; ">取消</el-button>
          <el-button type="primary" @click="addVideoList">确认</el-button>
        </span>
      </template>
    </el-dialog>

// 点击新增视频
    openAddVideoFile(){
      this.resetVideoFile();
      this.addVideoFile = true;
    },
    closeDialog() {
      this.addVideoFile = false;
    },
    //清空新增弹框数据
    resetVideoFile(){
      this.fileInfo.id = null;
      this.fileInfo.title = '';
      this.fileInfo.content = '';
      this.fileInfo.url = '';
    },
    //点击上传视频
    chooseVideo() {
      const fileInput = document.createElement("input");
      fileInput.style.display = "none";
      fileInput.type = "file";
      fileInput.accept = "video/*"; // 限制接受所有视频类型
      fileInput.onchange = () => {
        if (fileInput.files) {
          if (this.addVideoFile === true){
            this.fileInfo.selectedFile = fileInput.files[0];
            console.log("********************this.fileInfo.selectedFile",this.fileInfo.selectedFile);
          }
        }
        fileInput.remove();
      };

      // 触发文件选择对话框
      fileInput.click();
    },
    chooseVideoFile(){
      const fileInput = document.createElement("input");
      fileInput.style.display = "none";
      fileInput.type = "file";
      fileInput.accept = ".doc,.docx,application/pdf,.xlsx,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,.zip,application/x-msdownload,.md,application/x-rar-compressed,video/mp4,text/plain";
      fileInput.onchange = () => {
        if (fileInput.files) {
          if (this.addVideoFile === true){
            this.fileInfo.selectedVideoFile = fileInput.files[0];
            console.log("********************this.fileInfo.selectedVideoFile",this.fileInfo.selectedVideoFile);
          }
        }
        fileInput.remove();
      };

      // 触发文件选择对话框
      fileInput.click();
    },
    // 新增视频提交
    addVideoList(){
      if(this.$dataFormat.isEmpty(this.fileInfo.title)||this.$dataFormat.isEmpty(this.fileInfo.content)||this.$dataFormat.isEmpty(this.fileInfo.selectedVideoFile)){
        ElMessage({
          message: '请先补全信息',
          type: 'warning',
        })
        return;
      }
      // 检查是否选择了文件
      if (this.fileInfo.selectedFile || this.fileInfo.selectedVideoFile){
        let url = "/ArDownLoad/addVideoList";
        let data = {
          type:2,//查视频管理的所有数据
          fileType:'v',//v:视频
          title: this.fileInfo.title,
          content:this.fileInfo.content,
          url:this.fileInfo.selectedFile,
          videoUrl:this.fileInfo.selectedVideoFile,
        }
        this.$request.postForm(url,data).then(res =>{
          this.$msg.warning('新增成功!')
          this.addVideoFile = false;
          this.videoFilter();
        }).catch(() => {
        })
      }

    },

三、后端代码
调用了文件处理的封装方法，哈哈