如何将参数传递给作为addEventListener的参数传递或分配给事件处理程序的函数?
问题描述：
像在el.onclick = doSomething(param);
答
当您需要将参数传递给另一个函数时，可以使用匿名函数，例如:
You can use an anonymous function when you need to pass parameters to another, like this:
el.addEventListener("click", function() { doSomething(param); }, false);
如果不需要需要参数，那么它将是:
Whereas if it didn't need parameters, it would just be:
el.addEventListener("click", doSomething, false);