.val() works on input elements (or any element with a
value attribute?) and .text() will not work
on input elements. .val() gets the value of
the input element -- regardless of
type. .text() gets the innerText (not HTML)
of all the matched elements:\
ref:val() and text()
jquery val() and text().,布布扣,bubuko.com
原文：http://www.cnblogs.com/listened/p/3735573.html