在jQuery中缓存$（this）是最佳实践吗？

Question

We all know it's good to cache calls to the DOM, so instead of calling $('#someElement') more times, just save it to a var $someElement and use that.

But is it the same when using $(this) inside an event listener for example? Should $(this) be cached?

Thank you.

Answer 1

如果多次调用$(this) ，最好执行var $this = $(this);

Answer 2

每次调用$(this)或$(selector)都是一个函数调用，以创建一个新的jQuery对象...因此，如果您已经创建了一次，则缓存将保存调用该函数以再次创建同一对象的时间。

Answer 3

If you refer to the same element later in the event function, yes. Outside of the function it doesn't make any sense to do so because the value of this will have changed.