vue 2.7 vue-router 3.6.5 onforeRouteLeave is called Be twice, from entering other pages and when returning from other pages

[liguangyi1991]

E.g: There are three pages A, B, C.
The B page uses the keep-alive package, and onBeforeLeave is in the B page;
when entering the C page from the B page, and returning from the C page to the B page, the onBeforeLeave method is called.

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