jquery 处理后退AJAX的问题

大家都知道在画面上用JS处理的内容,点Ｅ后退后，原先画面上的操作都没有了．
例如通过点一个ＢＵＴＴＯＮ在画面的某一个位置添加某些内容（计算总件数等），然后去了下一个画面，当点ＩＥ的后退回来时这一些信息就没有了．
为了解决这个问题，可以参考下记办法．
首先，用history这个ＪＳ
jquery.history.js　内容参考下面

jQuery.extend({
historyCurrentHash: undefined,
i
historyCallback: undefined,

historyInit: function(callback){
jQuery.historyCallback = callback;
var current_hash = location.hash;

jQuery.historyCurrentHash = current_hash;
if ((jQuery.browser.msie) && (jQuery.browser.version <) {
// To stop the callback firing twice during initilization if no hash present
if (jQuery.historyCurrentHash == '') {
jQuery.historyCurrentHash = '#';
}

// add hidden iframe for IE
$("body").prepend('<iframe id="jQuery_history" style="display: none;"></iframe>');
var ihistory = $("#jQuery_history")[0];
var iframe = ihistory.contentWindow.document;
iframe.open();
iframe.close();
iframe.location.hash = current_hash;
}
else if ($.browser.safari) {
// etablish back/forward stacks
jQuery.historyBackStack = [];
jQuery.historyBackStack.length = history.length;
jQuery.historyForwardStack = [];

jQuery.isFirst = true;
}
jQuery.historyCallback(current_hash.replace(/^#/, ''));
setInterval(jQuery.historyCheck, 100);
},

historyAddHistory: function(hash) {
// This makes the looping function do something
jQuery.historyBackStack.push(hash);

jQuery.historyForwardStack.length = 0; // clear forwardStack (true click occured)
this.isFirst = true;
},

historyCheck: function(){
if ((jQuery.browser.msie) && (jQuery.browser.version <) {
// On IE, check for location.hash of iframe
var ihistory = $("#jQuery_history")[0];
var iframe = ihistory.contentDocument || ihistory.contentWindow.document;
var current_hash = iframe.location.hash;
if(current_hash != jQuery.historyCurrentHash) {

location.hash = current_hash;
jQuery.historyCurrentHash = current_hash;
jQuery.historyCallback(current_hash.replace(/^#/, ''));

}
} else if ($.browser.safari) {
if (!jQuery.dontCheck) {
var historyDelta = history.length - jQuery.historyBackStack.length;

if (historyDelta) { // back or forward button has been pushed
jQuery.isFirst = false;
if (historyDelta < 0) { // back button has been pushed
// move items to forward stack
for (var i = 0; i < Math.abs(historyDelta); i++) jQuery.historyForwardStack.unshift(jQuery.historyBackStack.pop());
} else { // forward button has been pushed
// move items to back stack
for (var i = 0; i < historyDelta; i++) jQuery.historyBackStack.push(jQuery.historyForwardStack.shift());
}
var cachedHash = jQuery.historyBackStack[jQuery.historyBackStack.length - 1];
if (cachedHash != undefined) {
jQuery.historyCurrentHash = location.hash;
jQuery.historyCallback(cachedHash);
}
} else if (jQuery.historyBackStack[jQuery.historyBackStack.length - 1] == undefined && !jQuery.isFirst) {
// back button has been pushed to beginning and URL already pointed to hash (e.g. a bookmark)
// document.URL doesn't change in Safari
if (document.URL.indexOf('#') >= 0) {
jQuery.historyCallback(document.URL.split('#')[1]);
} else {
var current_hash = location.hash;
jQuery.historyCallback('');
}
jQuery.isFirst = true;
}
}
} else {
// otherwise, check for location.hash
var current_hash = location.hash;
if(current_hash != jQuery.historyCurrentHash) {
jQuery.historyCurrentHash = current_hash;
jQuery.historyCallback(current_hash.replace(/^#/, ''));
}
}
},
historyLoad: function(hash){
var newhash;

if (jQuery.browser.safari) {
newhash = hash;
}
else {
newhash = '#' + hash;
location.hash = newhash;
}
jQuery.historyCurrentHash = newhash;

if ((jQuery.browser.msie) && (jQuery.browser.version <) {
var ihistory = $("#jQuery_history")[0];
var iframe = ihistory.contentWindow.document;
iframe.open();
iframe.close();
iframe.location.hash = newhash;
jQuery.historyCallback(hash);
}
else if (jQuery.browser.safari) {
jQuery.dontCheck = true;
// Manually keep track of the history values for Safari
this.historyAddHistory(hash);

// Wait a while before allowing checking so that Safari has time to update the "history" object
// correctly (otherwise the check loop would detect a false change in hash).
var fn = function() {jQuery.dontCheck = false;};
window.setTimeout(fn, 200);
jQuery.historyCallback(hash);
// N.B. "location.hash=" must be the last line of code for Safari as execution stops afterwards.
//      By explicitly using the "location.hash" command (instead of using a variable set to "location.hash") the
//      URL in the browser and the "history" object are both updated correctly.
location.hash = newhash;
}
else {
  jQuery.historyCallback(hash);
}
}
});


然后在画面上写上下记代码：
先在画面上加一个ＨＩＤＤＥＮ框，
然后进行下面的操作．
$(function(){

$.historyInit(pageload);
})

下记可以在ＯＮＳＵＭＢＩＴ的时候处理的方法
function setHistoryInfo(info1Id,info2Id) {
要保存的内容．．．（把ＪＳ处理的ＨＴＭＬ保存的ＨＩＤＤＥＮ框中）

$.historyLoad(1);
}

当后退返回时要处理的内容．
function pageload(hash) {
if(hash) {
要处理的内容．．．（从ＨＩＤＤＥＮ框中取出以前保存的内容）
       })