错误写法

public.js：


var QQMapWX = require('qqmap-wx-jssdk.js'); //引入官方插件
var qqmapsdk = new QQMapWX({ key: 'XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX' });

function getLocation() {
    var data;
    wx.getLocation({
        type: 'wgs84',
        success: function (res) {
            let latitude = res.latitude;
            let longitude = res.longitude;
            qqmapsdk.reverseGeocoder({
                location: {
                    latitude: latitude,
                    longitude: longitude
                },
                success: function (res) {
                    data = res.result;
                }
            });
        },
    });
 
    return data;
}


index.js：

var publicJS = require('../utils/public.js');
 
locationSelect: function() {
    var locationData = publicJS.getLocation();
    console.log(locationData);
}


更改

把回调函数的值用 promise resolve出去 用async+await接受 或者 .then接受

public.js

function getLocation() {
    return new Promise(function(resolve, reject){
         wx.getLocation({
            type: 'wgs84',
            success: function (res) {
                let latitude = res.latitude;
                let longitude = res.longitude;
                qqmapsdk.reverseGeocoder({
                    location: {
                        latitude: latitude,
                        longitude: longitude
                    },
                    success: function (res) {
                        resolve(res.result);
                    }
                });
            },
        });
    })
   

}


index:js


var publicJS = require('../utils/public.js');
 
locationSelect: function() { 
    publicJS.getLocation().then(function(locationData){
        console.log(locationData);
    })
}