When pressed, it reads the current value of the UI field and writes it into the output data model.

当按下这个按钮时，它将读取ui字段的当前值并将其写入输出数据模型。

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This one grabs the current node's title attribute (remember, the context is important here), and returns its value, which is then output.

该表达式取得当前节点的 title 属性（要记住，在这里上下文很重要）并返回其值，然后输出这个值。

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As you can see from the output (Listing 2), the perror function displays the string you pass to it, followed by a colon, a space, and then the textual representation of the current errno value.

正如您可以从输出(清单2)中看到的，perror函数显示了传递给它的字符串，后跟冒号、空格，接着是当前errno值的文字表示形式。

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