You can click the Back button in the browser to return to the input form and enter different data, which is displayed when you click post a message again.
可以单击浏览器中的 Back 按钮返回输入表单，输入不同的数据，再次单击 post a message 时会显示新的数据。
Precisely, the script does not call itself, but posts form data to itself. This process is known as post back.
准确的说这种代码并没有调用自身，只是传递形成的数据给自身，这个过程被称为往回传递。
I'd encourage you to refresh your memory and read one of my blog post back one year ago - PLM Data, Identification and Part Numbers.
我想再次唤醒大家的记忆，请重新读一读这篇一年前写的博文——PLM数据，身份标识和零件编号。
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