[Bug Report] search组件，输入中文字符时会触发两次onchange事件
Open
- Dominant language
- Vue
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Description
### VUX version
2.9.2
### OS/Browsers version
Android/ios
### Vue version
2.6.10
### Code
```html
无
```
### Steps to reproduce
输入中文字符
### What is Expected?
文本变化时触发一次onChange事件
### What is actually happening?
输入中文字符触发了两次onChange事件
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