* 检测一个<INPUT> 的输入内容，只允许输入有效的数字，发现真不是件容易的事情
* 不知道怎么设定 tabindex 才能跳回到第一个 form 元素，总是跳出去就再也找不到焦点了(也许和我们的框架有关系)
:(
笨蛋程序员
* 检测一个<INPUT> 的输入内容，只允许输入有效的数字，发现真不是件容易的事情
* 不知道怎么设定 tabindex 才能跳回到第一个 form 元素，总是跳出去就再也找不到焦点了(也许和我们的框架有关系)
:(
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