HTML Form 中 disabled 的元件的值不會被送出去阿 XDDDDD
http://www.w3.org/TR/html401/interact/forms.html#h-17.12.1是這樣說的：
In this example, the INPUT element is disabled. Therefore, it cannot receive user input nor will its value be submitted with the form.
然後抱怨一下，不是這樣無聲無息地把 exception 吃掉吧，這樣 debug 很困難的……。