return false;和e.preventDefault();的区别

from:http://css-tricks.com/return-false-and-prevent-default/

Have you ever seen those two things (in the title) being used in jQuery? Here is a simple example:

$("a").click(function() {   $("body").append($(this).attr("href"));   return false;}

That code would append the href attribute as text to the body every time a link was clicked butnot actually go to that link. The return false; part of that code prevents the browser from performing the default action for that link. That exact thing could be written like this:

$("a").click(function(e) {   $("body").append($(this).attr("href"));   e.preventDefault();}

So what's the difference?

The difference is that return false; takes things a bit further in that it also prevents that event from propagating (or "bubbling up") the DOM. The you-may-not-know-this bit is that whenever an event happens on an element, that event is triggered on every single parent element as well. So let's say you have a box inside a box. Both boxes have click events on them. Click on the inner box, a click will trigger on the outer box too, unless you prevent propagation. Like this:

This demo.

So in other words:

function() {  return false;}// IS EQUAL TOfunction(e) {  e.preventDefault();  e.stopPropagation();}

It's all probably a lot more complicated than this and articles like this probably explain it all a lot better.