<script type="text/javascript">
            $(function () {
                $("span").animate({
                    left: "+=100px"
                }, 3000, function () {
                    $(this).animate({
                        height: '+=60px',
                        width: '+=60px'
                    }, 3000, function () {
                        $("#tip").html("执行完成!");
                    });
                });
                $("#btnStop").bind("click", function () {
                  $("span").stop()
                    $("#tip").html("执行停止!");
                });
            });

还是执行完成了..