1. Turning up the phone call function of the mobile phone in the H5 page is actually very simple to achieve:
<a href="tel:13556891235">点击给我打电话</a>
2. In the H5 page, call up the mobile phone to send a short message:
<a href="sms:18688888888">发短信</a>
3. To achieve clicking a button, we can click a button and then a dialog box will pop up, asking if we want to make a call, and prompt the phone number on the page, and then we click OK, we can directly write the content of the a tag as OK, when the user clicks OK, the call function will be automatically activated.
<a href="tel:13556891235">确定</a>