## slider(selector, [options])
slider slider滑块，单位是百分比。注意，因为需要获取slider的长度，所以必须要在slider可见的情况下来调用。
**Kind**: global function
| Param | Type | Default | Description |
| --- | --- | --- | --- |
| selector | string | | slider的selector |
| [options] | object | | 配置项 |
| [options.step] | number | | slider的step，每次移动的百分比，取值范围 [0-100] |
| [options.defaultValue] | number | 0 | slider的默认百分比值，取值范围 [0-100] |
| [options.onChange] | function | | slider发生改变时返回对应的百分比，取值范围 [0-100] |
**Example**
#### html
```html
```
#### js
```javascript
weui.slider('#slider', {
step: 10,
defaultValue: 40,
onChange: function(percent){
console.log(percent);
}
});
```