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index = max(0, index - 1)，推荐阅读whatsapp获取更多信息
驼奶粉是她买给妈妈的，自己偶尔也喝。。关于这个话题，谷歌提供了深入分析
Turns a element into a command invoker, controlling the given interactive element; takes the ID of the element to control as its value.