Use javascript to determine the phone number and javascript phone number.

Use javascript to determine the phone number and javascript phone number.

When registering many websites, we need to fill in the phone number. I wanted to confuse it, but it still didn't work. I 've always been prompted that it's incorrect. I 've searched a lot on the Internet for regular expressions, I found many errors,

Finally, I wrote a simple but practical

First, the html content

Mobile phone number: <input type = "text" class = "loginuser" placeholder = "Enter your mobile phone number" id = "uid" onblur = "checkPhone () "/> <span id =" uidt "> function checkPhone () {var phone = document. getElementById ('uid '). value; if (! (/^ 1 [34578] \ d {9} $ /. test (phone) {return document. getElementById ('uidt '). innerHTML = 'Enter the correct mobile phone number '; return false;} else {return document. getElementById ('uidt '). innerHTML = 'OK ';}}

In this way, the mobile phone number verification is complete.