主要内容(图标，链接，号召行动按钮)：蓝色。

Primary (logo, links, call-to-action buttons) : blue.

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为了克服文盲障碍，Lewis决定用画面图标(而不是文字)来表示行动按钮，以便卑格米人能按下GPS按钮并确定重要的位置。

To overcome illiteracy barriers, Lewis decided to create pictorial ICONS for the action buttons — rather than words — so that the Pygmies could click and identify important sites on the GPS sets.

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因此，清单4使用click处理函数来确定每个按钮采取什么行动，便于您以后依此处理数据。

Therefore, Listing 4 USES the click handler for each button to determine what action to take so that you can then process the data accordingly.

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