pushHistory(); 
 window.addEventListener("popstate", function(e) { 
 window.location = 'http://www.baidu.com';
 }, false); 
 function pushHistory() { 
 var state = { 
 title: "title", 
 url: "#"
 }; 
 window.history.pushState(state, "title", "#"); 
 }

/**
 * 使用 HTML5 的 History 新 API pushState 來曲線監聽 Android 設備的返回按鈕
 * XBack.listen(function(){
 alert('oh! you press the back button');
 });
 */
;!function(pkg, undefined){
 var STATE = 'x-back';
 var element;
 var onPopState = function(event){
 event.state === STATE && fire();
 }
 var record = function(state){
 history.pushState(state, null, location.href);
 }
 var fire = function(){
 var event = document.createEvent('Events');
 event.initEvent(STATE, false, false);
 element.dispatchEvent(event);
 }
 var listen = function(listener){
 element.addEventListener(STATE, listener, false);
 }
 ;!function(){
 element = document.createElement('span');
 window.addEventListener('popstate', onPopState);
 this.listen = listen;
 record(STATE);
 }.call(window[pkg] = window[pkg] || {});
}('XBack');

XBack.listen(function(){
 alert('back');
});