How to implement input password box prompt information in js (with html5 implementation method)_javascript skills

The example in this article describes how to implement input password box prompt information in js. Share it with everyone for your reference, the details are as follows:

Today our supervisor said that we should add a "please enter password" prompt message in the password box. The first time we thought about using the method of modifying the input type attribute, it turned out that some special browsers did not support it, IE The type attribute of the input is read-only and cannot be set dynamically. So use other methods. The example is as follows:

<input type="text" onfocus="changeTip(this);" id="passText" name="passText" value="请输入密码"/>
<input style="display: none;" type="password" onblur="changeTip(this);" id="pass" placeholder="" name="pass" value=""/>
<script type="text/javascript">
function changeTip(th){
 var passText = document.getElementById('passText');
 var pass = document.getElementById('pass');
 if(th.id == 'pass'){
  if(th.value == '' || th.value.length == 0 ){
   passText.style.display='';
   pass.style.display='none';
  }
 }else{
  passText.style.display='none';
  pass.style.display='';
  pass.focus();
 }
}
</script>

Supplement:

In fact, the above large section of code can be solved using a placeholder attribute of HTML5. The code is as follows:

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I hope this article will be helpful to everyone in JavaScript programming.