一旦我们理解在请求过程中发生的各个就绪状态之后，接下来就可以来看一下XMLHttpRequest对象的另外一个方面了——responsetext属性。
Once you understand the various ready states that occur during a request, you're ready to look at another important piece of the XMLHttpRequest object — the responseText property.
店员：建议你到门诊看一下，如果不严重，是不需要用药的，注意生活习惯就可以了。
Salesman: I suggest you to see a doctor, if it is not too bad, you don't have to take pills, just try to establish some healthy living habits.
店员：建议你到门诊看一下，如果不严重，是不需要用药的，注意生活习惯就可以了。
Salesman: I suggest you to see a doctor, if it is not too bad, you don't have to take pills, just try to establish some healthy living habits.
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