// 封装函数 计算距离
distance: function (la1, lo1, la2, lo2) {
var La1 = la1 * Math.PI / 180.0;
var La2 = la2 * Math.PI / 180.0;
var La3 = La1 - La2;
var Lb3 = lo1 * Math.PI / 180.0 - lo2 * Math.PI / 180.0;
var s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(La3 / 2), 2) + Math.cos(La1) * Math.cos(La2) * Math.pow(Math.sin(Lb3 / 2), 2)));
s = s * 6378.137;
s = Math.round(s * 10000) / 10000;
s = s.toFixed(2);
return s;
},
// 发送请求查询目的地经度纬度 获取当前位置 使用方法
onLoad: function (options) {
let _this = this
let id = options.id;
wx.request({
url: 'http://www.week.com/index.php/msg',
data:{id:id},
success(e){
let data = e.data.data;
let latitude= e.data.data.latitude;
let longitude=e.data.data.longitude;
wx.getLocation({
success(e){
let la = e.latitude
let lo = e.longitude
let distance = _this.distance(la,lo,latitude,longitude)
_this.setData({distance})
}
})
_this.setData({data,latitude,longitude})
}
})
}