<el-upload  class="upload-demo"  action="https://jsonplaceholder.typicode.com/posts/"  :on-preview="handlePreview"  :on-remove="handleRemove"  :file-list="fileList">  <el-button size="small" type="primary">點擊上傳</el-button>  <div slot="tip" class="el-upload__tip">只能上傳jpg/png文件，且不超過500kb</div></el-upload><script>  export default {    data() {      return {        fileList: [{name: 'food.jpeg', url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100'}, {name: 'food2.jpeg', url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100'}]      };    },    methods: {      handleRemove(file, fileList) {        console.log(file, fileList);      },      handlePreview(file) {        console.log(file);      }    }  }</script>上面是element-ui的官方組件