JS编写定位笔记

使用JS编写的定位功能，只适用于基础的定位。先收着以防万一

function Location() {};

Location.prototype.getLocation = function (callback) {
    var options = {
        enableHighAccuracy: true,
        maximumAge: 1000
    };
    this.callback = Object.prototype.toString.call(callback) == "[object Function]" ?
        callback :
    function (address) {
        alert(address.province + address.city);
        console.log("getocation(callbackFunction) 可获得定位信息对象");
    };
    var self = this;
    if (navigator.geolocation) {
        //浏览器支持geolocation
        navigator.geolocation.getCurrentPosition(function (position) {
            //经度
            var longitude = position.coords.longitude;
            //纬度
            var latitude = position.coords.latitude;
            self.loadMapApi(longitude, latitude);
        }, self.onError, options);
    } else {
        //浏览器不支持geolocation
    }
};

Location.prototype.loadMapApi = function (longitude, latitude) {
    var self = this;
    var oHead = document.getElementsByTagName('HEAD').item(0);
    var oScript = document.createElement("script");
    oScript.type = "text/javascript";
    oScript.src = "http://api.map.baidu.com/getscript?v=2.0&ak=A396783ee700cfdb9ba1df281ce36862&services=&t=20140930184510";
    oHead.appendChild(oScript);
    oScript.onload = function (date) {
        var point = new BMap.Point(longitude, latitude);
        var gc = new BMap.Geocoder();
        gc.getLocation(point, function (rs) {
            var addComp = rs.addressComponents;
            self.callback(addComp);
        });
    }
};

Location.prototype.onError = function (error) {
    switch (error.code) {
    case 1:
        alert("位置服务被拒绝");
        break;
    case 2:
        alert("暂时获取不到位置信息");
        break;
    case 3:
        alert("获取信息超时");
        break;
    case 4:
        alert("未知错误");
        break;
    }
};

//调用
var local = new Location();
local.getLocation(function (res) {
    //此处就是返回的地理位置信息
    console.log(res);
    //JSON.stringify(res)，把返回的对象转为字符串了，自己根据需求截取下就好
    var resstr = JSON.stringify(res);
    alert(resstr);