To simplify things, we'll start with a single callback that counts the number of button clicks.

为了简单化，我们从一个单独的计算按钮被按次数的回调开始。

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Each XML data model can contain any number of data instances; the data instance is linked to a button used to trigger the submission of a data instance.

每个XML数据模型可以包含任意数量的数据实例；数据实例链接到一个按钮，这个按钮用来触发数据实例的提交。

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This enables the user to use the back button to switch between both screens while displaying the number of stocks in the cart.

这样就允许用户在显示购物车中股票数量时使用“后退”按钮在两个屏幕间切换。

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While operating the Abacus 2006 is straightforward, it can take a number of button presses to get to the content you want.

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The volunteer was then supposed to record, using a press-button counter, the number of times he perceived the insect moving on his skin.

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Such a button may lead to a large number of impulsive sales.

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