[Bug Report] PopupPicker 组件

### VUX version
2.9.2

### OS/Browsers version
win 10

### Vue version
2.5.17-beta.0

### Code

```html

pickerChange:function (value) {
console.log(value.toString());
let _this = this;
_this.PickerTitle = value.toString()
}
```

### Steps to reproduce
点击完成触发 on-change 事件 只返回value

### What is Expected?
on-change 事件 返回对应 name及value

### What is actually happening?
on-change 事件 只返回 value