jQuery - 按值查找单选按钮

Question

我正在为这个问题摸不着头脑。

HTML:

<form>
      <input name="changes" type="radio" value="2012-05-18T16%3A53%3A00.000000000000%2B0100">
      <span>2012-05-18 16:53:00 +0100</span>
      <input name="changes" type="radio" value="2012-05-29T16%3A51%3A00.000000000000%2B0100">
      <span>2012-05-29 16:51:00 +0100</span>
      <input name="changes" type="radio" value="2012-05-31T17%3A30%3A00.000000000000%2B0100">
      <span>2012-05-31 17:30:00 +0100</span>
      <input name="changes" type="radio" value="2012-06-01T16%3A30%3A00.000000000000%2B0100">
      <input id="view-change" type="button" value="View">
</form>

在 Chrome JavaScript 控制台中:

var today = "2012-05-18T16%3A53%3A00.000000000000%2B0100"
$('input[value="2012-05-18T16%3A53%3A00.000000000000%2B0100"]') -> Finds object
$('input[value=today]') -> Nothing

嗯？为什么我无法使用 var 选择输入？

PS。我已经确认， jQuery.type(today) = string

Answer 1

尝试:

$('input[value="'+today+'"]')

参见jsfiddle