其工作原理是这样的：当松开一个键时，update text框内的字符数就被从140减掉。
The way it works is, when a key is released, the number of characters found in the update text box is subtracted from 140.
在“string”框内输入要发送到Web服务的测试字符串，并单击“Go”按钮，以调用服务，如下面的图7中所示。
Enter a test string to send to your Web service in the "string" box and click the "Go" button to invoke the service, as per Figure 7 below.
请问一个编辑框内的字符如何用蓝色方框围起来的问题，应该不难的。
I ask how a character edit box blue box surrounded the issue, should not be difficult to.
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