#### 组件名称
gov-cascade

#### 解释：
cascade

#### 属性说明：
|属性名 | 类型 | 必填 | 默认值 |说明 |
|---|---|---|---|---|
|range |Array |否||pikcer内容 二维数组必传 [[], [], []]|
|labelWidth |String |否|6em|左侧文字宽度，须包含单位，例如em、px、rpx、vw、vh... 默认为4字宽度4em，6字宽度6em, 建议用em，可以适配|
|label |String |否||左侧文字描述|
|placeholder |String |否||picker没值默认显示|
|value |Array |否||picker选中时的下标|
|rangeKey |String |否||指定 Object 中 key 的值作为选择器显示内容|
|errColor |String |否|#BD1A2D|picker label颜色|
|errStatus |Boolean |否|false|picker label是否飘红|
|disabled |Boolean |否|false|联动是否为禁用型显示|
|tips |Array |否||前面未选提示的内容|
|noborder |Boolean |否|false|联动picker是否有下边框线|

#### 代码示例
swan:
```
<gov-cascade range='{{multiArray}}' label='四字折行折行' value='{{[]}}' rangeKey='name' labelWidth='4em' tips='{{['请选择省', '请选择市', '请选择区']}}' bind:change='change' placeholder='{{['请选择省', '请选择市', '请选择区']}}'/>   <gov-cascade range='{{multiArray}}' label='无下边框线' noborder='{{true}}' value='{{[]}}' rangeKey='name' labelWidth='6em' tips='{{['请选择省', '请选择市', '请选择区']}}' bind:change='change' placeholder='{{['请选择省', '请选择市', '请选择区']}}' />    <gov-cascade range='{{multiArray}}'label='六字折行折行六字' value='{{[]}}' rangeKey='name' labelWidth='6em' tips='{{['请选择省', '请选择市', '请选择区']}}' bind:change='change' placeholder='{{['请选择省', '请选择市', '请选择区']}}' /> <gov-cascade range='{{multiArray}}' label='提示型' value='{{[]}}' rangeKey='name' labelWidth='4em' tips='{{['请选择省', '请选择市', '请选择区']}}' bind:change='change' placeholder='{{['请选择省', '请选择市', '请选择区']}}' /> <gov-cascade range='{{multiArray}}' label='禁用型' value='{{[]}}' rangeKey='name' labelWidth='4em' disabled bind:change='change' placeholder='{{['请选择省', '请选择市', '请选择区']}}' />      <gov-cascade range='{{array}}' label='回填' value='{{[1, 2, 1]}}' rangeKey='name' labelWidth='4em' tips='{{['请选择省', '请选择市', '请选择区']}}' bind:change='change' placeholder='{{['请选择省', '请选择市', '请选择区']}}' />        <gov-cascade range='{{multiArray}}' label='label飘红' value='{{[]}}' errStatus='{{true}}' rangeKey='name' labelWidth='4em' tips='{{['请选择省', '请选择市', '请选择区']}}' bind:change='change' placeholder='{{['请选择省', '请选择市', '请选择区']}}' />        <gov-cascade range='{{multiArray}}' label='externalClass' value='{{[]}}' gov-lable='gov-lable' errStatus='{{true}}' rangeKey='name' labelWidth='4em' tips='{{['请选择省', '请选择市', '请选择区']}}' bind:change='change' placeholder='{{['请选择省', '请选择市', '请选择区']}}' />
```
js:
```
 Page({ data: { multiArray: [[], [], []], array: [[{ name: '太原市', value: 1 }, { name: '大同市', value: 2 }, { name: '吕梁市', value: 3 }], [{ name: '太原市', value: 1 }, { name: '大同市', value: 2 }, { name: '吕梁市', value: 3 }], [{ name: '太原市', value: 1 }, { name: '大同市', value: 2 }, { name: '吕梁市', value: 3 }]] }, change({detail}) { if (detail.value.length === 1) { let array = []; swan.showLoading({ title: '正在加载...', mask: true }); setTimeout(() => { switch (detail.value[0]) { case 0: array = [{ name: '北京市', value: 1 }]; break; case 1: array = [{ name: '太原市', value: 1 }, { name: '大同市', value: 2 }, { name: '吕梁市', value: 3 }]; break; case 2: array = [{ name: '哈尔滨市', value: 1 }, { name: '齐齐哈尔市',value: 2}, {name: '大庆市',value: 3}];break;default:break;}swan.hideLoading();this.data.multiArray[1] = array;this.setData('multiArray', this.data.multiArray);}, 500);}else if (detail.value.length === 2) {let area = [];swan.showLoading({title: '正在加载...',mask: true});setTimeout(() => {if (detail.value[0] === 0 && detail.value[1] === 0) {area = [{name: '海淀区',value: 1}, {name: '大兴区',value: 2}, {name: '朝阳区',value: 3}];}else if (detail.value[0] === 1) {if (detail.value[1] === 0) {area = [{name: '小店区',value: 1}, {name: '迎泽区',value: 2}, {name: '杏花岭区',value: 3}];}else if (detail.value[1] === 1) {area = [{name: '南郊区',value: 1}, {name: '新荣区',value: 2}, {name: '阳高区',value: 3}];}else if (detail.value[1] === 2) {area = [{name: 孝义市',value: 1}, {name: '离石市',value: 2}, {name: '汾阳市',value: 3}];}}else if (detail.value[0] === 2) {if (detail.value[1] === 0) {area = [{name: '道里区',value: 1}, {name: '南岗区',value: 2}, {name: '太平区',value: 3}];}else if (detail.value[1] === 1) {area = [{name: '龙沙区',value: 1}, {name: '建华区',value: 2}, {name: '铁锋区',value: 3}];}else if (detail.value[1] === 2) {area = [{name: '龙凤区',value: 1}, {name: '红岗区',value: 2}, {name: '林甸县',value: 3}];}}swan.hideLoading();this.data.multiArray[2] = area;this.setData('multiArray', this.data.multiArray);}, 500);}},onLoad() {let arr = [{name: '北京市',value: 1},{name: '山西省',value: 2}{name: '黑龙江省',value: }];this.data.multiArray[0] = arr;this.setData('multiArray', this.data.multiArray);}});
```
css:
```
 .gov-lable { color: #6495ed !important; }.gov-picker-content { color: #6495ed; }
```