ajax load本地页面，显示error，找不到这个页面，是怎么回事？

 $("#btnshow").bind("click", function() {
                var $this = $(this);
                $(".content")
                    .html("<img src='images/lovely.jpg' alt=''/>")
                    .load('food.html', function(responseText, textStatus) {
                        $this.attr("disabled", "true");
                        alert(responseText.toString());
                        alert(textStatus);
                    })
            })