Millent修复x-input type =number 在安卓qq浏览器下 v-model 绑定无效

[Jon-Millent]

#2960
经过测试发现的原因，是 input.selectionStart 在 type 为 number的时候部分浏览器不允许选择，所以报错触发不了 $emit('input')。

目前唯一允许安全选择文本的元素是：
如下所述：
参考
https://stackoverflow.com/questions/21177489/selectionstart-selectionend-on-input-type-number-no-longer-allowed-in-chrome

[codecov-io]

Codecov Report

Merging #3083 into v2 will increase coverage by 0.33%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##               v2    #3083      +/-   ##
==========================================
+ Coverage   19.45%   19.78%   +0.33%     
==========================================
  Files         226      226              
  Lines        5603     5605       +2     
  Branches      710      710              
==========================================
+ Hits         1090     1109      +19     
+ Misses       4394     4360      -34     
- Partials      119      136      +17

Impacted Files	Coverage Δ
src/components/x-input/index.vue	14.7% <100%> (+11.13%)	⬆️
src/components/inline-calendar/util.js	71.76% <0%> (-7.06%)	⬇️
src/components/blur/blur.js	66.66% <0%> (+2.15%)	⬆️
src/components/x-img/index.vue	25% <0%> (+5%)	⬆️
src/libs/base.js	45.45% <0%> (+27.27%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 690b78b...4bbf705. Read the comment docs.