因为map接受一个参数,即一个函数,我们可以用_占位符来替代有名参数。
Because map takes one argument, a function, we can use the "placeholder" indicator _ instead of a named parameter.
我们在传给foreach 的这个字面函数中再一次使用了一个 _ 占位符。
We use a _ placeholder shortcut again in another function literal that we pass to foreach.
在浏览器上,您需要一个函数来处理Ajax请求、一个响应信息的占位符、一个或多个用户可交互的热点。
On the browser, you need a function to create an Ajax request, placeholders for response information, and one or more hotspots with which the user can interact.
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