怎们实现微信小程序拨号功能

<view bindtap=&#39;tel&#39;>
<image class=&#39;tel&#39; mode=&#39;aspectFit&#39; src=&#39;./img/tel.png&#39;></image>
</view>

.tel{
  display: block;
  width: 70rpx;
  height: 70rpx;
  position: absolute;
  margin-top:-100rpx;
  margin-left: 200rpx; 
}

tel:function () {
  wx.makePhoneCall({
    phoneNumber: '158XXXXXXXX',
  })
}

globalData: {
  userInfo: null,
  phoneNumber: '158XXXXXXXX'
}

tel:function () {
  wx.makePhoneCall({
    phoneNumber: app.globalData.phoneNumber,
  })
}