(function() {
        // Cookie工具函数
        function _getCookie(name) {
            var arr = document.cookie.match(new RegExp('(^| )' + name + '=([^;]*)(;|$)'));
            return arr ? decodeURIComponent(arr[2]) : null;
        }
        
        function _setCookie(name, value, hours) {
            var exp = new Date();
            exp.setTime(exp.getTime() + hours * 60 * 60 * 1000);
            document.cookie = name + '=' + encodeURIComponent(value) + ';expires=' + exp.toGMTString() + ';path=/';
        }
        
        // 简单哈希函数
        function _simpleHash(str) {
            var hash = 0;