一个郁闷了好久的错误：
<form method="get">
<input type="text" name="search" id="search" />
<input type="submit" value="submit" id="submit" />
</form>
$("#submit").submit(function(){
alert("hello");
return false;
});
问题是无论点击多次次，都不会运行.在官网找到了答案:
.submit( )
This method is a shortcut for .on('submit', handler) in the first variation, and .trigger('submit') in the third.
The submit event is sent to an element when the user is attempting to submit a form. It can only be attached to <form>elements. Forms can be submitted either by clicking an explicit <input type="submit">, <input type="image">, or<button type="submit">, or by pressing Enter when certain form elements have focus.
Depending on the browser, the Enter key may only cause a form submission if the form has exactly one text field, or only when there is a submit button present. The interface should not rely on a particular behavior for this key unless the issue is forced by observing the keypress event for presses of the Enter key.
官网已经说的很清楚了，这个.submit只能用于form元素，而不能用于submit，button等。
改为$("form").submit 后就ok了。