Ajax URL＃没有更新

I have a little problem with my script here. For some reason, it doesn't enable the #-tags and I don't know why. I created this javascript using the help of this tutorial. (The loading of the pages works well with no problems at all.)

Could someone please look it over and tell me why it doesn't work?

 var default_content="";

    $(document).ready(function(){   //executed after the page has loaded

        checkURL(); //check if the URL has a reference to a page and load it

        $('ul li a').click(function (e){    //traverse through all our navigation links..

                checkURL(this.hash);    //.. and assign them a new onclick event, using their own hash as a parameter (#page1 for example)

        });

        setInterval("checkURL()",250);  //check for a change in the URL every 250 ms to detect if the history buttons have been used

    });

    var lasturl=""; //here we store the current URL hash

    function checkURL(hash)
    {
        if(!hash) hash=window.location.hash;    //if no parameter is provided, use the hash value from the current address

        if(hash != lasturl) // if the hash value has changed
        {
            lasturl=hash;   //update the current hash
            loadPage(hash); // and load the new page
        }
    }

    function loadPage(url)  //the function that loads pages via AJAX
    {
        // Instead of stripping off #page, only 
        // strip off the # to use the rest of the URL
        url=url.replace('#','');

     $('#loading').css('visibility','visible'); //show the rotating gif animation

         $.ajax({
            type: "POST",
            url: "load_page.php",
            data: 'page='+url,
            dataType: "html",
            success: function(msg){

                   if(parseInt(msg)!=0) //if no errors
                {
                    $('#content').html(msg);    //load the returned html into pageContet

                }  $('#loading').css('visibility','hidden');//and hide the rotating gif
            }

        });

    }

You can simplify this immensely by adding a function to listen to the hashchange event, like this:

$(window).on("hashchange", function() {
    loadPage(window.location.hash);
});

This way you don't need to deal with timers or overriding click events on anchors.

You also don't need to keep track of lasthash since the hashchange even will only fire when the hash changes.