el-upload的limit="3"限制上傳圖片無效？

<el-upload

            class="upload-demo"
            ref="upload"
            :action="url"
            name="myfile"
            :accept="accept"
            :on-error="uploadError"
            :on-success="uploadSuccess"
            :multiple="multiple"
            :limit="3"
            :on-exceed="handleExceed"
            :file-list="fileList"
            :change="addFile"
            :auto-upload="false">
        <el-button size="small" type="primary">選取文件1</el-button>
      
        
        <div slot="tip" class="el-upload__tip">{{ acceptText }}</div>
    </el-upload>