<!-- generated by https://eleme-issue.surge.sh DO NOT REMOVE --> ### Element UI version 2.7.1 ### OS/Browsers version Mac Chrome latest ### Vue version 2.6.10 ### Reproduction Link [https://codesandbox.io/s/wywokm1mlk](https://codesandbox.io/s/wywokm1mlk)  ### Steps to reproduce * open developer console * click on switches and labels * see multiple log in console ### What is Expected? Only 2 logs for each action (one for @input and one for @change). ### What is actually happening? 4 to 6 actions are logged depending on the case. <!-- generated by https://eleme-issue.surge.sh DO NOT REMOVE --> (please allow codesanbox link in issue generator)