前言

项目需要通过选取地址来获取经纬度，进而计算两点的距离。直接使用uni.chooseLoaction 发现偏差实在是太大。

解决方案

使用腾讯的 地图选点组件
传送门：https://lbs.qq.com/webApi/component/componentGuide/componentPicker

第一步 申请key设置referer

注意：这里的应用名称填英文，我设置的中文，后面的链接填写referer的时候总是报错，换成英文就好了

第二步 uniapp页面

1.在需要获取位置信息的页面加个跳转
这里我们是跳转到webview页面去获取地址

2.在onload里面加个判断，解析返回的数据信息
当我们在webview页面获取信息之后还要跳转回当前页面，带着数据信息

onLoad(options) {
	if(options.loc){
		let loc = JSON.parse(options.loc);
		//做你的数据处理
	}
},
methods: {
	openAddres:function(){
		uni.redirectTo({
			url:"../getAddress/getAddress"
		})
	}
}

3.webview页面
因为我之前保存的是WGS84格式坐标，转换成GCJ02坐标

<template>
	<view>
		<web-view :src="url"></web-view>
	</view>
</template>

<script>
	const gcoord = require('gcoord'); //坐标转换
	export default {
		data() {
			return {
				url:""
			}
		},
		onLoad(options) {
			var result = gcoord.transform(
			  [uni.getStorageSync('longitude'), uni.getStorageSync('latitude')],    // 经纬度坐标
			  gcoord.WGS84,               // 当前坐标系
			  gcoord.GCJ02                 // 目标坐标系
			);
			this.url = "https://apis.map.qq.com/tools/locpicker?coord="+result[1]+","+result[0]+"&search=1&type=1&key="+this.txKey+"&referer=anmoba"
			window.addEventListener('message', event=> {
			  // 接收位置信息，用户选择确认位置点后选点组件会触发该事件，回传用户的位置信息
			    var loc = event.data;
				if (loc && loc.module == 'locationPicker') {
			        //防止其他应用也会向该页面post信息，需判断module是否为'locationPicker'
			        console.log('location', loc);
					uni.redirectTo({
						url:"../editAddress/editAddress?loc="+JSON.stringify(loc)+"&query="+options.query+"&isedit="+options.isedit+"&id="+options.id
					})
				}
			}, false);
		},
		onHide() {
			window.removeEventListener();
		},
		methods: {
		}
	}
	
</script>

<style>

</style>

gcoord坐标转换源码

/* @preserve
 * gcoord 0.2.2, geographic coordinate library
 * Copyright (c) 2019 Jiulong Hu <me@hujiulong.com>
 */
!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t(e.gcoord={})}(this,function(e){"use strict";var t="WGS84",r=t,n=t,o="GCJ02",a=o,i="BD09",u=i,f=i,c=i,s="BD09MC",l=s,M="EPSG3857",g=M,h=M,v=M,d=M;function m(e){throw new Error(e)}function G(e){return!isNaN(e)&&null!==e&&!S(e)}function S(e){return!!e&&"[object Array]"===Object.prototype.toString.call(e)}function P(){for(var o=[],e=0;e<arguments.length;e++)o[e]=arguments[e];var a=o.length-1;return function(){for(var e=[],t=0;t<arguments.length;t++)e[t]=arguments[t];for(var r=a,n=o[a].apply(null,e);r--;)n=o[r].call(null,n);return n}}var b=Math.sin,y=Math.cos,p=Math.sqrt,B=Math.abs,D=Math.PI,C=6378245,E=.006693421622965823;function W(e){var t=e[0],r=e[1];if(!J(t,r))return[t,r];for(var n=[t,r],o=n[0],a=n[1],i=x([o,a]),u=i[0]-t,f=i[1]-r;1e-6<B(u)||1e-6<B(f);)u=(i=x([o-=u,a-=f]))[0]-t,f=i[1]-r;return[o,a]}function x(e){var t=e[0],r=e[1];if(!J(t,r))return[t,r];var n=function(e,t){var r=function(e,t){var r=300+e+2*t+.1*e*e+.1*e*t+.1*p(B(e));return r+=2*(20*b(6*e*D)+20*b(2*e*D))/3,r+=2*(20*b(e*D)+40*b(e/3*D))/3,r+=2*(150*b(e/12*D)+300*b(e/30*D))/3}(e-105,t-35),n=function(e,t){var r=2*e-100+3*t+.2*t*t+.1*e*t+.2*p(B(e));return r+=2*(20*b(6*e*D)+20*b(2*e*D))/3,r+=2*(20*b(t*D)+40*b(t/3*D))/3,r+=2*(160*b(t/12*D)+320*b(t*D/30))/3}(e-105,t-35),o=t/180*D,a=b(o),i=p(a=1-E*a*a);return[r=180*r/(C/i*y(o)*D),n=180*n/(C*(1-E)/(a*i)*D)]}(t,r);return[t+n[0],r+n[1]]}function J(e,t){return 72.004<=e&&e<=137.8347&&.8293<=t&&t<=55.8271}var k=Math.sin,L=Math.cos,j=Math.atan2,I=Math.sqrt,q=3e3*Math.PI/180;function w(e){var t=e[0]-.0065,r=e[1]-.006,n=I(t*t+r*r)-2e-5*k(r*q),o=j(r,t)-3e-6*L(t*q);return[n*L(o),n*k(o)]}function N(e){var t=e[0],r=e[1],n=I(t*t+r*r)+2e-5*k(r*q),o=j(r,t)+3e-6*L(t*q);return[n*L(o)+.0065,n*k(o)+.006]}var O=180/Math.PI,A=Math.PI/180,F=6378137,_=20037508.342789244;function z(e){return[e[0]*O/F,(.5*Math.PI-2*Math.atan(Math.exp(-e[1]/F)))*O]}function T(e){var t=Math.abs(e[0])<=180?e[0]:e[0]-360*(e[0]<0?-1:1),r=[F*t*A,F*Math.log(Math.tan(.25*Math.PI+.5*e[1]*A))];return r[0]>_&&(r[0]=_),r[0]<-_&&(r[0]=-_),r[1]>_&&(r[1]=_),r[1]<-_&&(r[1]=-_),r}var U=Math.abs,H=Math.pow,K=[12890594.86,8362377.87,5591021,3481989.83,1678043.12,0],Q=[75,60,45,30,15,0],R=[[1.410526172116255e-8,898305509648872e-20,-1.9939833816331,200.9824383106796,-187.2403703815547,91.6087516669843,-23.38765649603339,2.57121317296198,-.03801003308653,17337981.2],[-7.435856389565537e-9,8983055097726239e-21,-.78625201886289,96.32687599759846,-1.85204757529826,-59.36935905485877,47.40033549296737,-16.50741931063887,2.28786674699375,10260144.86],[-3.030883460898826e-8,898305509983578e-20,.30071316287616,59.74293618442277,7.357984074871,-25.38371002664745,13.45380521110908,-3.29883767235584,.32710905363475,6856817.37],[-1.981981304930552e-8,8983055099779535e-21,.03278182852591,40.31678527705744,.65659298677277,-4.44255534477492,.85341911805263,.12923347998204,-.04625736007561,4482777.06],[3.09191371068437e-9,8983055096812155e-21,6995724062e-14,23.10934304144901,-.00023663490511,-.6321817810242,-.00663494467273,.03430082397953,-.00466043876332,2555164.4],[2.890871144776878e-9,8983055095805407e-21,-3.068298e-8,7.47137025468032,-353937994e-14,-.02145144861037,-1234426596e-14,.00010322952773,-323890364e-14,826088.5]],V=[[-.0015702102444,111320.7020616939,0x60e374c3105a3,-0x24bb4115e2e164,0x5cc55543bb0ae8,-0x7ce070193f3784,0x5e7ca61ddf8150,-0x261a578d8b24d0,0x665d60f3742ca,82.5],[.0008277824516172526,111320.7020463578,647795574.6671607,-4082003173.641316,10774905663.51142,-15171875531.51559,12053065338.62167,-5124939663.577472,913311935.9512032,67.5],[.00337398766765,111320.7020202162,4481351.045890365,-23393751.19931662,79682215.47186455,-115964993.2797253,97236711.15602145,-43661946.33752821,8477230.501135234,52.5],[.00220636496208,111320.7020209128,51751.86112841131,3796837.749470245,992013.7397791013,-1221952.21711287,1340652.697009075,-620943.6990984312,144416.9293806241,37.5],[-.0003441963504368392,111320.7020576856,278.2353980772752,2485758.690035394,6070.750963243378,54821.18345352118,9540.606633304236,-2710.55326746645,1405.483844121726,22.5],[-.0003218135878613132,111320.7020701615,.00369383431289,823725.6402795718,.46104986909093,2351.343141331292,1.58060784298199,8.77738589078284,.37238884252424,7.45]];function X(e,t,r){var n=U(t)/r[9],o=r[0]+r[1]*U(e),a=r[2]+r[3]*n+r[4]*H(n,2)+r[5]*H(n,3)+r[6]*H(n,4)+r[7]*H(n,5)+r[8]*H(n,6);return[o*=e<0?-1:1,a*=t<0?-1:1]}function Y(e){for(var t=e[0],r=e[1],n=[],o=0;o<Q.length;o++)if(U(r)>Q[o]){n=V[o];break}return X(t,r,n)}function Z(e){for(var t=e[0],r=e[1],n=[],o=0;o<K.length;o++)if(K[o]<=r){n=R[o];break}return X(t,r,n)}var $={to:{GCJ02:x,BD09:P(N,x),BD09MC:P(Y,N,x),EPSG3857:T}},ee={to:{WGS84:W,BD09:N,BD09MC:P(Y,N),EPSG3857:P(T,W)}},te={to:{WGS84:P(W,w),GCJ02:w,EPSG3857:P(T,W,w),BD09MC:Y}},re={to:{WGS84:z,GCJ02:P(x,z),BD09:P(N,x,z),BD09MC:P(Y,N,x,z)}},ne={to:{WGS84:P(W,w,Z),GCJ02:P(w,Z),EPSG3857:P(T,W,w,Z),BD09:Z}},oe=Object.freeze({WGS84:$,GCJ02:ee,BD09:te,EPSG3857:re,BD09MC:ne});function ae(e,t,r){e||m("coordinate is required"),t||m("original coordinate system is required"),r||m("target coordinate system is required");var n=oe[t];if(n||m("original coordinate system is invalid"),t===r)return e;var o=n.to[r];o||m("target coordinate system is invalid");var a=typeof e;if("string"!=a&&"object"!=a&&m("coordinate must be an geojson or an array of position"),"string"==a)try{e=JSON.parse(e)}catch(e){m("input is not a legal JSON string")}var i=!1;S(e)&&(e.length<2&&m("position must be at 2 numbers long"),G(e[0])&&G(e[1])||m("position must contain numbers"),e=e.map(Number),i=!0);var u=o;return i?u(e):(function e(t,r,n){if(void 0===n&&(n=!1),null!==t)for(var o,a,i,u,f,c,s,l,M=0,g=0,h=t.type,v="FeatureCollection"===h,d="Feature"===h,G=v?t.features.length:1,S=0;S<G;S++){f=(l=!!(s=v?t.features[S].geometry:d?t.geometry:t)&&"GeometryCollection"===s.type)?s.geometries.length:1;for(var P=0;P<f;P++){var b=0,y=0;if(null!==(u=l?s.geometries[P]:s)){var p=u.type;switch(M=!n||"Polygon"!==p&&"MultiPolygon"!==p?0:1,p){case null:break;case"Point":if(!1===r(c=u.coordinates,g,S,b,y))return!1;g++,b++;break;case"LineString":case"MultiPoint":for(c=u.coordinates,o=0;o<c.length;o++){if(!1===r(c[o],g,S,b,y))return!1;g++,"MultiPoint"===p&&b++}"LineString"===p&&b++;break;case"Polygon":case"MultiLineString":for(c=u.coordinates,o=0;o<c.length;o++){for(a=0;a<c[o].length-M;a++){if(!1===r(c[o][a],g,S,b,y))return!1;g++}"MultiLineString"===p&&b++,"Polygon"===p&&y++}"Polygon"===p&&b++;break;case"MultiPolygon":for(c=u.coordinates,o=0;o<c.length;o++){for(a=y=0;a<c[o].length;a++){for(i=0;i<c[o][a].length-M;i++){if(!1===r(c[o][a][i],g,S,b,y))return!1;g++}y++}b++}break;case"GeometryCollection":for(o=0;o<u.geometries.length;o++)if(!1===e(u.geometries[o],r,n))return!1;break;default:m("Unknown Geometry Type")}}}}}(e,function(e){var t;t=u(e),e[0]=t[0],e[1]=t[1]}),e)}var ie={WGS84:t,WGS1984:r,EPSG4326:n,GCJ02:o,AMap:a,BD09:i,BD09LL:u,Baidu:f,BMap:c,BD09MC:s,BD09Meter:l,EPSG3857:M,EPSG900913:g,EPSG102100:h,WebMercator:v,WM:d,transform:ae};e.WGS84=t,e.WGS1984=r,e.EPSG4326=n,e.GCJ02=o,e.AMap=a,e.BD09=i,e.BD09LL=u,e.Baidu=f,e.BMap=c,e.BD09MC=s,e.BD09Meter=l,e.EPSG3857=M,e.EPSG900913=g,e.EPSG102100=h,e.WebMercator=v,e.WM=d,e.transform=ae,e.default=ie,Object.defineProperty(e,"__esModule",{value:!0})});

以上，完成，经测试。定位相当准确！