The first and most intuitive use for an arrow function would be as an anonymous callback.
首先介绍箭头函数最直观的用法，即用作匿名回调函数。
If required, use the arrow icon on the function to select something other than the default.
如果需要，可以使用该功能上的箭头图标选择除缺省功能以外的其他功能。
According to time or radiant exposure setting countdown timer, Arrow keys facilitate displayed program function and characteristics.
根据时间或辐射曝晒设置的倒数计时器；箭头键便于滚动显示程序功能与特征。
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