Vue triggers input selection file click event operation

.upload-btn-box {
  margin-bottom: 10px;
  button {
    margin-right: 10px;
  }
  input[type=file] {
    display: none;
  }
}

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

choiceImg(){
  this.$(new MouseEvent('click')) 
},
getFile(){
      var that = this;
      const inputFile = this.$[0];
      if(inputFile){
        if( !== 'image/jpeg' &&  !== 'image/png' &&  !== 'image/gif'){
          alert('Not a valid picture file!  ');
          return;
        }
         = ({}, , {
          name: ,
          size: ,
          lastModifiedDate: ()
        })
        const reader = new FileReader();
        (inputFile);
         = function (e) {
           = ;
        }
      } else {
        return;
      }
    }

const DeviceManage = r => ([], () => r(require(deviceManagePath + 'main/DeviceManage')), 'g-DeviceManage');
const SingleDeviceSet = r => ([], () => r(require(deviceManagePath + 'deviceSet/SingleDeviceSet')), 'g-DeviceManage');
const ModifyNo = r => ([], () => r(require(deviceManagePath + 'modifyNo/ModifyNo')), 'g-DeviceManage');
const PricePerTime = r => ([], () => r(require(deviceManagePath + 'pricePerTime/PricePerTime')), 'g-DeviceManage');
const SetParams = r => ([], () => r(require(deviceManagePath + 'setParams/SetParams')), 'g-DeviceManage');
const ShowDevicePrice = r => ([], () => r(require(deviceManagePath + 'showDevicePrice/ShowDevicePrice')), 'g-DeviceManage');
const parameterSetting = r => ([], () => r(require(deviceManagePath + 'parameterSetting/parameterSetting')), 'g-DeviceManage');
const SetParams3G = r => ([], () => r(require(deviceManagePath + 'setParams3G/SetParams3G')), 'g-Device3Gparams');