TextArea word count monitoring and regular monitoring on the mobile side

Mobile Friends may encounter input box input number of words, naturally think of KeyDown keyUp event, but the fact is not as you think, when you are operating on the iOS phone (Android seems to be very rarely this case), on the keyboard after the word selection text, this time there is no Punish anything, at this point the click is not the keyboard nor the page document is not any DOM node and does not trigger KeyDown keyUp:

At this point we can use: the input event

<textarea name= ' intro ' ></textarea>$ (' textarea[name= ' intro "] '). On (' input ',function () {  if().val (). Trim (). length >= 0 && $ (this).val (). Trim ().　　Length <=) {console.log (70-$ (Thiselse  {console.log (0); }});

TextArea word count monitoring and regular monitoring on the mobile side