文件上传

  <el-upload
                    class="upload-demo"
                    action="http://localhost:81/common/upload"
                    :on-change="handleChange"
                    :file-list="fileList">
                    <el-button size="small" type="primary">点击上传</el-button>
                    <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
                </el-upload>