www.gusucode.com > 自己收集整理的HTML5网页应用实例源码程序 > 自己收集整理的HTML5网页应用实例/prohtml5HTML5入门学习的好例子(代码)/prohtml5HTML5入门学习的好例子(代码)/offline/tracker.js
/* * Track and report the current location */ var handlePositionUpdate = function(e) { var latitude = e.coords.latitude; var longitude = e.coords.longitude; log("Position update:", latitude, longitude); if(navigator.onLine) { uploadLocations(latitude, longitude); } storeLocation(latitude, longitude); } var handlePositionError = function(e) { log("Position error"); } var uploadLocations = function(latitude, longitude) { var request = new XMLHttpRequest(); request.open("POST", "http://geodata.example.net:8000/geoupload", true); request.send(localStorage.locations); } var storeLocation = function(latitude, longitude) { // load stored location list var locations = JSON.parse(localStorage.locations || "[]"); // add location locations.push({"latitude" : latitude, "longitude" : longitude}); // save new location list localStorage.locations = JSON.stringify(locations); } var geolocationConfig = {"maximumAge":20000}; navigator.geolocation.watchPosition(handlePositionUpdate, handlePositionError, geolocationConfig);