修复当value为0 点击事件接受到参数是空的bug

[wangshantao]

Please makes sure the items are checked before submitting your PR, thank you!

• Rebase before creating a PR to keep commit history clear.
• Only One commit
• No eslint errors

[codecov-io]

Codecov Report

Merging #2209 into v2 will increase coverage by 0.13%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##               v2   #2209      +/-   ##
=========================================
+ Coverage   20.46%   20.6%   +0.13%     
=========================================
  Files         213     213              
  Lines        5165    5165              
  Branches      579     579              
=========================================
+ Hits         1057    1064       +7     
+ Misses       4005    3997       -8     
- Partials      103     104       +1

Impacted Files	Coverage Δ
src/components/actionsheet/index.vue	18.75% <0%> (ø)	⬆️
src/components/blur/blur.js	66.66% <0%> (+2.15%)	⬆️
src/components/selector/index.vue	18.6% <0%> (+4.65%)	⬆️
src/components/x-img/index.vue	25% <0%> (+5%)	⬆️
src/components/qrcode/index.vue	12.9% <0%> (+6.45%)	⬆️

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