el-upload 点击阻止弹窗

<el-upload
    class="upload-file-demo"
    style="margin-top: 20px;"
    action="/api/admin/other/upload/filed"
    ref="cert_uploadComp"
    :auto-upload="true"
    :show-file-list='true'
    :file-list="cert_certificates"
    :before-upload="beforeUpload"
    :on-change="handlePictureCardPreview"
    :on-success="handleuploadsuccess.bind(null, {'index': index})"
    :on-exceed="handleExceed"
    :on-remove="cert_handleRemove.bind(null, {'index': index})"
    :limit="2"
    :disabled="cert_loading"
    accept=".jpg,.jpeg,.png"
    :data="cert_uploadData">
    <div slot="tip" class="el-upload__tip" style="position: absolute;top: 7px;left: 15px;color: #AFAFAF;">{{$t('home.Photosholdingmorethan25shares')}}</div>
    <el-button :loading="cert_loading" class="" size="small" type="primary">{{$t('home.Selectfile')}}</el-button>
    <i slot="tip" @click="delMorethan25Data(index)" class="el-icon-minus dels"/>
</el-upload>

注： slot="tip"