<button  catchtap="toCall">免费咨询</button>

toCall:function(e){    
    wx.makePhoneCall({
      phoneNumber: this.data.info.traininfo.phone,
      success: function () {
        console.log(\'成功拨打电话\')
      }
    })
  },

<view class="page_li sub" data-phone="{{shop.shopinfo.contact_phone}}" catchtap="tophone">
    <image class="page_phone" src="/image/iocn.png" mode="aspectFill"></image>
    打电话
</view>

tophone: function(el) {
    let phone = el.currentTarget.dataset.phone;
    // console.log(phone)
    wx.makePhoneCall({
        phoneNumber: phone,
        success: function() {
            console.log(\'成功拨打电话\')
        }
    })
  },