You need to remove the quotes. <li onClick={this.pageUp.bind(this)}>...
In vanilla javascript you would probably have οnclick="somefunctionname". But not in JSX, yo need to pass a function as stated in the error.
Also, the .bind(this) is not necessary if you are using React.createClass, once you have removed the quotes you will probably get a warning stating that is not necessary since React does that for you.
JSX中事件处理与React绑定详解
本文探讨了在JSX语法中如何正确使用事件处理函数,避免常见的错误,如使用引号包裹函数名。同时,深入解析React中this绑定的机制,解释为什么在某些情况下不需要使用.bind(this),并提供了实例说明。

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