A simple example of using javascript to determine a phone number

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Judge the phone number simply written in javascript

When registering on many websites, we are required to fill in the phone number. I originally wanted to fool it, but it didn't work. It kept prompting that it was incorrect. I searched a lot online, regular expression, I found a lot of mistakes,

Finally I wrote a simple but more practical one

First is the content of the html part

手机号：<input type="text" class="loginuser" placeholder="请输入您的手机号" id="uid" onblur="checkPhone()" />
        <span id="uidt" style="margin-left: 100px"></span>

The content in the span tag It is mainly used to write prompts. For example, if you enter it incorrectly, you will be prompted "Please enter the correct mobile phone number." If you enter it correctly, you will be prompted "OK";

Then comes the javascript part

 function checkPhone(){
    var phone = document.getElementById('uid').value;
    if(!(/^1[34578]\d{9}$/.test(phone))){
      return document.getElementById('uidt').innerHTML = '请输入正确的手机号';
      return false;
    }    else{return document.getElementById('uidt').innerHTML = 'ok';}
  }

Such a simple mobile phone number verification is completed

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