Vue触发隐藏input file的方法

<p class="uploadImg">
    <input type="file" @change="picUpload($event)" accept="image/*" />
</p>

.uploadImg {
    width: 100%;
    height: 1.46rem;
    position: relative;
    input {
      width: 1.46rem;
      height: 100%;
      z-index: 1;
      opacity: 0;
      position: absolute;
      cursor: pointer;
    }
}

<div class="upload-btn-box">
　 <Button @click="choiceImg" icon="ios-cloud-upload-outline" type="primary">点击上传</Button>
   <input ref="filElem" type="file" class="upload-file" @change="getFile">
</div>

choiceImg(){
    this.$refs.filElem.dispatchEvent(new MouseEvent('click')) 
},
getFile(){
    console.log("成功");
}

<label for="upfile" class="pTitleRight" @click="IDRecognition">
<span>身份证识别</span>
    <i class="iconfont">&#xe612;</i>
    <input ref="filElem" type="file" accept="image/*" id="upfile" name="upfile" style="display: none;" @change="uploadPic">
</label>

IDRecognition: function() {},    //触发事件  
uploadPic: function() {
  console.log('dsa');
}