/**
 * desc: 本地存储
 * author: wangyang
 * date: 2015-04-11
 */
define(function() {
    return {
		setItem: function(key, value) {
			if (!window.localStorage) {
				return;
			}
			window.localStorage.setItem(key, JSON.stringify(value));
			window.localStorage.setItem(key + '-time', parseInt(new Date().getTime() / 1000));
		},
		getItem: function(key, reset_time) {
			if (!window.localStorage) {
				return null;
			}
			var t = window.localStorage.getItem(key);
			if (t !== null && typeof reset_time === 'number') {
				var c_time = parseInt(new Date().getTime() / 1000);
				var cache_time = window.localStorage.getItem(key + '-time');
				cache_time = !cache_time ? 0 : parseInt(cache_time);
				if (c_time - cache_time > reset_time) {
					t = null;
					this.removeItem(key);
					this.removeItem(key + '-time');
				}
			}
			if (t === null) {
				return t;
			} else {
				return JSON.parse(t);
			} 
		},
		removeItem: function(key) {
			if (!window.localStorage) {
				return;
			}
			window.localStorage.removeItem(key);
			window.localStorage.removeItem(key + '-time');
		},
		clear: function() {
			if (!window.localStorage) {
				return;
			}
			window.localStorage.clear();
		}
	};
})