Input real-time monitoring and acquisition of focus issues, Oninput,ononfocus

1.input monitors real-time input issues, Google Chrome uses oninput, and other browsers (IE6/7/8) use Onpropertychange

var ie =!! window. ActiveXObject;   if (IE) {      = fn;  } Else {      Object.addeventlistener ("Input", FN,false);  

Usage of onkeyup,onkeydown,onkeypress:
The onkeyup event occurs when the keyboard key is released.
The onkeydown event occurs when the user presses a keyboard key.
The onkeypress event occurs when the keyboard key is pressed and a key is released.

Usage of Onfocus,onblur:

The onfocus event occurs when the object receives focus.
The onblur event occurs when the object loses focus.

Input real-time monitoring and acquisition of focus issues, Oninput,ononfocus