JavaScript input box content format verification code_form effects

Code

Copy code The code is as follows:

Username: < ;input type="text" id="name" />

//Verification results Display, note that display is hidden


Password: //pwd input box obtained The onfocus event is triggered when the focus is on, and the content format of the name input box is verified to be correct.
<script> <br>var name = document.getElementById("name"); <br>function bb(){ <br>d. style.display = 'block'; //Display div <br>if(name.value.match(/^w /)) { //Use regular expressions to verify the entered user name <br>d.innerHTML = " dui"; <br>} <br>else{ <br>d.innerHTML = "cuo"; <br>} <br>} <br></script>