event.preventDefault 和 return false 的比较

return false from within a jQuery event handler is effectively the same as calling both e.preventDefault and e.stopPropagation on the passed jQuery.Event object. e.preventDefault() will prevent the default event from occuring, e.stopPropagation() will prevent the event from bubbling up and return false will do both. Note that this behaviour differs from normal (non-jQuery) event handlers, in which, notably, return false does not stop the event from bubbling up. 综上所述,return false 并不能完美的执行 取消默认动作的指令,经过测试,jquery的function 中,IE 8 用return false 是不行的,比如submit 表单,会提交2此,但是在firefox,chrome,IE9 中都是可行的。