Ways to prevent default events from occurring

1. In the event handler, add return false;
2. The event object is used in standard browsers. Preventdefault ()

IE low version of the browser's wording: Window.event.returnValue = false;

Compatible with a variety of browser wording:

if (Evt.preventdefault) {

Evt.preventdefault (); How to block default events for standard browsers

} else {

Evt.returnvalue = false; The wording of the IE low version browser

}

3

Hyperlink A, in addition to having two methods to block default events, can also write:

<a href = "javascript:void (0)" class = "login_btn" id= "login_btn" > Login </a>

Ways to prevent default events from occurring