vue前端图片上传、回显图片

方法一(基于vue+html)：

文件:上传 

方法二(基于vue+element)：

return{
    imgUrl:'http://localhost:8080/mainupfile/photo',//文件上传访问后端的路径
    dialogImageUrl: null,
    dialogVisible: false,
    uploadDisabled: false,
    limitcount: 1,
}
methods:{
    /** 回显图片 */
    getAssetsFile(url){
      return new URL(`../../assets/upload/${url}`, import.meta.url).href
    },
    /**选择图片*/
    handleChange(file, fileList) {
      this.uploadDisabled = fileList.length >= this.limitcount;
      console.log("this.uploadDisabled", this.uploadDisabled);
      return false;
    },
    /**删除图片*/
    handleRemove(file, fileList) {
      this.uploadDisabled = fileList.length >= this.limitcount;
      console.log("this.uploadDisabled", this.uploadDisabled);
    },
    /**成功获取图片*/
    onSuccess: function (response) {
      // this.imgUrl= this.FormList;
      this.dialogImageUrl = response;
      //
      this.FormList.reason = response
    },
}

方法三(基于vue+vant)：

 
从相册中选择

const afterRead = async (file) => {
    const modifiedFile = new File([file.file], '.png'); // 修改文件名为 new_filename.jpg
  try {
    const formData = new FormData();
    formData.append('file', modifiedFile);
    const response = await axios.post('http://localhost:8080/upphoto/fileUpload', formData, {
      headers: {
        'Content-Type': 'multipart/form-data',
      },
    });
    console.log("图片为:"+response.data);
    showToast({
      type: 'success',
      message: '头像上传成功',
    });
    photo.value = response.data;
    console.log("photo:"+photo.value);
    console.log("response.data:"+response.data);
  } catch (error) {
    console.error('头像上传失败:', error);
    showToast({
      type: 'fail',
      message: '头像上传失败',
    });
  }
};

图片预览效果的实现：

Element Plus官网实现：

如果不想用官网的方法，就自己定义事件：

//弹出图片层
  //逻辑，我这里是使用了ts语法setup
const previewDialogVisible = ref(false);
const previewImageUrl = ref('');
const getAssetsFile=(url: string)=>{
    return new URL(`../assets/upload/${url}`, import.meta.url).href;
    // return "../assets/upload/"+ url
}
const openPreview = (url: string) => {
  previewImageUrl.value = getAssetsFile(url);
  previewDialogVisible.value = true;
};