微信小程序实现全国机场索引列表

<view class="city-layer {{isShowLayer ? '' : 'layer-hide'}}">
{[code]}

<view class="current-choose-city">当前选择机场：{{chooseCity}}
<scroll-view class="city-scroll" scroll-y="true" style="height:{{cityHeight}}px" bindscroll="scroll" scroll-top="{{scrollTop}}">
<view class="city-box" wx:for="{{cityList}}" wx:key="{{item.code}}">
<view class="city-code">{{item.code}}
<view class="city-list" wx:for="{{item.cityList}}" wx:for-item="city" bindtap="getChooseCity" data-city="{{city}}">
{{city}}

/提示点击的字母 /
.city-layer{
width: 70px;
height: 70px;
line-height: 70px;
text-align: center;
border-radius: 50%;
color: #fff;
background-color: rgba(0,.7);
position: fixed;
top: calc(50% - 35px);
left:calc(50% - 35px);
z-index: 11;
}
.layer-hide{display: none;}

Page({
data: {
cityList: city_list.city,chooseCity: '您还未选择机场！',isShowLayer: false,chooseIndex: 0,len: [],code: null,codeHeight: null,cityHeight:null,scrollTop: 0
},onLoad (options) {
var windowHeight = wx.getSystemInfoSync().windowHeight;
var arr = [];

this.data.cityList.forEach(current => arr.push(current.cityList.length + 1));
this.setData({
codeHeight: (windowHeight - 50) / this.data.cityList.length,cityHeight: windowHeight - 50,len: arr
});
},getCurrentCode(e){
var index = 0,sum = 0,self = this;

for (var i = 0; i < this.data.cityList.length;i++){
if (this.data.cityList[i].code === e.target.dataset.code){
index = i
break;
}
}
for (var j = 0; j < index; j++) {
sum += this.data.len[j];
}

this.setData({
code: e.target.dataset.code,scrollTop: sum * 40,chooseIndex: index,isShowLayer: true
});

setTimeout(() => {
self.setData({ isShowLayer: false })
},500);
},getChooseCity(e){
this.setData({ chooseCity: e.target.dataset.city });
}
})