javascript:重新加载js文件

 //重新加载js文件
        function loadJs(file) {
            var head = $("head").remove("script[role=\'reload\']");
            $("<scri" + "pt>" + "</scr" + "ipt>").attr({ role: \'reload\', src: file, type: \'text/javascript\' }).appendTo(head);
        }