The Unbind event in JS

Unbind event:
/*
* Note: In what way to bind the event, you should use the corresponding way to unbind the event
* 1. Unbind Event
* object. On Event name = event handler function---> Bind event
* object. On event name =null;
* 2. Unbind Event
* Object. AddEventListener ("Event type not on", named function, FALSE);---binding event
* Object. RemoveEventListener ("No event type on", function name, false);
* 3. Unbind Event
* Object. Attachevent ("On event type", named function);---binding event
* Object. DetachEvent ("On event Type", function name);
*
*
* */

Page

<! DOCTYPE html>
　
binding and reconciling compatibility codes
<! DOCTYPE html>
　　
The first way is common.
my$ ("Btn"). Onclick=function () {console.log ("AA");} my$ ("Btn"). Onclick=null;
　　
The second way is common (Firefox Google)
/The second way to support Google and Firefox, does not support IE8  function F1 () {    console.log ("first");  }  function F2 () {    Console.log ("second");  }  my$ ("Btn"). AddEventListener ("click", F1,false);  my$ ("Btn"). AddEventListener ("click", F2,false);  Click the second button to unbind my$ ("Btn2") from the first click event of the first button  . Onclick=function () {    //Unbind event, need to use named function my$ when binding event    ("BTN") . RemoveEventListener ("click", F1,false);  };
　　
The Third Way is common (IE8)
The third type supports IE8    function F3 () {    console.log ("first");  }  function F4 () {    Console.log ("second");  }  my$ ("Btn"). Attachevent ("onclick", F3);  my$ ("Btn"). Attachevent ("onclick", F4);  my$ ("Btn2"). Onclick=function () {      my$ ("btn"). DetachEvent ("onclick", F3);  };
　　
　
The Unbind event in JS