如果就绪状态为4，我们不仅要运行回调函数中的代码，而且还要在每次调用回调函数时都输出就绪状态。
Instead of only running code in your callback if the ready state is 4, just output the ready state every time that your callback is called.
我希望这种反馈回立即发生，因为没有什么事情比每次输入无效值之后重复提交整个HTML表单更令人沮丧。
I want this feedback to happen immediately, because nothing's more frustrating than repeatedly submitting an entire HTML form and getting chastised each time for typing in an invalid value.
Morrison网络新闻编辑Ken Morrison说，从历史上看每次创出新高后，金价总会出现一波回调。
Ken Morrison, editor of online newsletter Morrison on the Markets, said historically gold has witnessed pullbacks every time it has made a new high.
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