string | loading的文字 |
| [options] | object | 配置项 |
| [options.className] | string | 自定义类名 |
**Example**
```js
var loading = weui.loading('loading', {
className: 'custom-classname'
});
setTimeout(function () {
loading.hide(function() {
console.log('`loading` has been hidden');
});
}, 3000);
```