location.hash来保持页面状态

 /*本例是为了在客户端页面返回时保存状态，采用hash值记录的模式，为了使用方便所写的存取hash值的库，时间仓促，望指出错误。*/
var pageStateHash = {
        hashArray: [],
        getHashArray: function() {
            var _self = this;
            if (window.location.hash.replace(‘#‘,‘‘) != ‘‘) {
                _self.hashArray = window.location.hash.replace(‘#‘,‘‘).split(‘&‘);
            }
        },
        applyHash: function() {
            var _self = this;
            window.location.hash = ‘#‘ + _self.hashArray.join(‘&‘);
        },
        hashIndex: function(key) {
            var _self = this;
            var ret = -1;
            _self.getHashArray();
            for (var i in _self.hashArray) {
                var item = _self.hashArray[i].split(‘=‘);
                var length = item.length;
                if (length == 2 && item[0] == key) {
                    ret = i;
                }
            }
            return ret;
        },
        set: function(key, value) {
            var _self = this;
            var hashIndex = _self.hashIndex(key);
            console.log(‘hash index = ‘+hashIndex);
            if (hashIndex == -1) {
                _self.hashArray.push(key + ‘=‘ + value);
            } else {
                _self.hashArray[hashIndex] = key + ‘=‘ + value;
            }

            _self.applyHash();
        },
        get: function(key) {
            var _self = this;
            var hashIndex = _self.hashIndex(key);
            if (hashIndex == -1) {
                return ‘‘;
            } else if (_self.hashArray[hashIndex].split(‘=‘).length == 2) {
                return _self.hashArray[hashIndex].split(‘=‘)[1];
            }
        }
    };
    /*pageStateHash.set(‘cate1‘, ‘8‘);
    pageStateHash.set(‘cate2‘, ‘9‘);
    console.log(‘get cate2 index:‘ +pageStateHash.get(‘cate2‘));*/