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$(window) bind hashchange how to check part hash changed?
$(window).bind('hashchange', function() {
    // make a judge like  if(){}else{}
});

(function(){
    var lastHash = location.hash;
    $(window).bind('hashchange', function() {
        var newHash = location.hash;
        // Do something
        var diff = compareHash(newHash, lastHash);
        alert("Difference between old and new hash:n"+diff[0]+"nn"+dif[1]);

        //At the end of the func:
        lastHash = newHash;
    });

    function compareHash(current, previous){
        for(var i=0, len=Math.min(current.length, previous.length); i<len; i++){
            if(current.charAt(0) != previous.charAt(0)) break;
        }
        current = current.substr(i);
        previous = previous.substr(i);
        for(var i=0, len=Math.min(current.length, previous.length); i<len; i++){
            if(current.substr(-1) != previous.substr(-1)) break;
        }

        //Array: Current = New hash, previous = old hash
        return [current, previous];
    }
})()

var originalHash = window.location.hash;
$(window).bind('hashchange', function() {
    var newHash = window.location.hash;
    //do your stuff based on the comparison of newHash to originalHash

    originalHash = newHash;
});