JS implementation form in time to verify the function of user information immediately verify _javascript tips

question: How to verify the form immediately after the input, rather than after the submission of verification so inconvenient (online search is either ambiguous, or incomplete ...) ）

method: In view of this, small, Shinshanchi, will be its code completion, plus a little of my personal understanding (note) on the above, only for the later less detours, but also please all the way hero criticism. (Forwarding please note author, xiexie) ———— table version, will continue to have the jquery version ...

If it helps you, ヾ (≧o≦) AW ~

Screenshots:

Code:

<! DOCTYPE html>  

CSS style:

 input:focus,textarea:focus{
  border:1px solid #f00;
  Background: #fcc;
 }

 textarea{
  width:230px;
  height:50px;
 }

 Body
 {
  font-size:15px;
  /* Font style * *
  font-family:microsoft Yahei 
 }

 Select option{
  font-size:10px;
  Font-family:microsoft Yahei;
 }

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