弹出按钮容器和按钮控件
按钮呈现在弹出按钮的 doStartTag 方法中。
The button is rendered in the doStartTag method of the pop-up button.
它巧用YouTube的弹出按钮，令观众点击几下就可以买到想要的东西。
It makes clever use of YouTube's pop-up buttons by letting viewers buy what they see with just a few clicks.
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