Stop event bubbling and script that blocks browser default behavior

In the front-end development work, because of browser compatibility issues, we often use "stop event bubbling" and "block browser default behavior."

1. Stop event bubbling

JavaScript code//If an event object is provided, this is a non-IE browser if (e && e.stoppropagation)//So it supports the Stoppropagation () method of the Web () e.s    Toppropagation ();    else//Otherwise, we need to use IE to cancel event bubbling window.event.cancelBubble = true; return false;

2. Block browser default behavior JavaScript code//If an event object is provided, this is a non-IE browser if (e && e.preventdefault)//block default browser action (Web-Consortium) E.pre    Ventdefault ();    Else//ie the way in which the default action of the function is blocked window.event.returnValue = false; return false;