vue ファイルのアップロードは 10mb を超えることができないことを認識する方法

 <el-form>
    <el-form-item>
        <el-upload>
            <el-button>上传</el-button>
            zip格式，大小不超过10M
        </el-upload>
    </el-form-item>
    <el-form-item>
        <el-button>立即添加</el-button>
        <el-button>取消</el-button>
    </el-form-item>
</el-form>

<script>import store from &#39;@/store/index&#39;;export default {
  data() {
    return {
      upload: {
        url: `${App.apiConfig.service}/dcp-manage/dcp/compile/manage/service/editor/version/upload`,
        header: {
          token: store.state.token        },
        resData: {}
      },
      form: {
        nameDesc: &#39;&#39;,
        age:&#39;&#39;
      },
      rules: {
        nameDesc: [
          { required: true, message: &#39;不能为空&#39;, trigger: &#39;blur&#39; }
        ],          
        fileName: [
          { required: true, message: &#39;不能为空&#39;, trigger: &#39;blur&#39; }
        ]
      }        
    }
  },    
  methods: {
    beforeUpload(file) {
      const sizeLimit = file.size / 1024 / 1024 > 10
      if (sizeLimit) {
        this.$message.warning(&#39;上传文件大小不能超过 10MB!&#39;)
      }
      const fileFamart = file.name.split(&#39;.&#39;)[file.name.split(&#39;.&#39;).length - 1];
      if (fileFamart !== &#39;zip&#39;) {
        this.$message.warning(&#39;必须上传zip格式的文件!&#39;)
      }
      return !sizeLimit && fileFamart === &#39;zip&#39;
    },
    onSuccess(data) {
      this.form = {
        ...this.form,
        ...data.data  // 把上传文件添加到form中
      }
      this.$message.success(&#39;上传成功!&#39;);
    },
    onError() {
      this.$message.error(&#39;上传失败!&#39;);
    },
    // 立即添加
    onSubmit() {
      this.$refs.ruleForm.validate(valid => {  // 校验form表单
        if (!valid) return false;

        ajax.post(&#39;cs_addVersion&#39;, this.form).then(res => {
          this.$message.success(&#39;新增成功!&#39;);
          this.backToList();  // 新增成功后返回
        }, err => {
          this.$message.error(&#39;新增失败!&#39;);
        });
      });
    },
    // 取消
    backToList() {
      this.$router.back();
    }      
  }}</script>