<a name="slider"></a>
## slider(selector, [options])
slider slider滑塊，單位是百分比。注意，因為需要獲取slider的長度，所以必須要在slider可見的情況下來調用。
**Kind**: global function
| Param | Type | Default | Description |
| --- | --- | --- | --- |
| selector | <code>string</code> | | slider的selector |
| [options] | <code>object</code> | | 配置項 |
| [options.step] | <code>number</code> | | slider的step，每次移動的百分比，取值范圍 [0-100] |
| [options.defaultValue] | <code>number</code> | <code>0</code> | slider的默認百分比值，取值范圍 [0-100] |
| [options.onChange] | <code>function</code> | | slider發生改變時返回對應的百分比，取值范圍 [0-100] |
**Example**
#### html
```html
<div class="weui-slider-box">
<div id="slider" class="weui-slider">
<div class="weui-slider__inner">
<div class="weui-slider__track"></div>
<div class="weui-slider__handler"></div>
</div>
</div>
<div id="sliderValue" class="weui-slider-box__value"></div>
</div>
```
#### js
```javascript
weui.slider('#slider', {
step: 10,
defaultValue: 40,
onChange: function(percent){
console.log(percent);
}
});
```
