LocalStorage 本地存储兼容函数

iLocalStorage.js

/*
* 名称：本地存储函数
* 功能：兼容各大浏览器存储
* 作者：轩枫
* 日期：2015/06/11
* 版本：V2.0
*/

/**
 * LocalStorage 本地存储兼容函数
 * getItem: 获取属性
 * setItem: 设置属性
 * removeItem: 删除属性
 *
 *
 * @example
 *
	iLocalStorage.setItem('key', 'value');
	console.log(iLocalStorage.getItem('key'));
	iLocalStorage.removeItem('key');
 *
 */


(function(window, document){

	// 1. IE7下的UserData对象
	var UserData = {
		userData: null,
		name: location.href,
		init: function(){
			// IE7下的初始化
			if(!UserData.userData){
				try{
					UserData.userData = document.createElement("INPUT");
					UserData.userData.type = "hidden";
					UserData.userData.style.display = "none";
					UserData.userData.addBehavior("#default#userData");
					document.body.appendChild(UserData.userData);
					var expires = new Date();
					expires.setDate(expires.getDate() + 365);
					UserData.userData.expires = expires.toUTCString();
				} catch(e){
					return false;
				}
			}
			return true;
		},

		setItem: function(key, value){
			if(UserData.init()){
				UserData.userData.load(UserData.name);
				UserData.userData.setAttribute(key, value);
				UserData.userData.save(UserData.name);
			}
		},

		getItem: function(key){
			if(UserData.init()){
				UserData.userData.load(UserData.name);
				return UserData.userData.getAttribute(key);
			}
		},

		removeItem: function(key){
			if(UserData.init()){
				UserData.userData.load(UserData.name);
				UserData.userData.removeAttribute(key);
				UserData.userData.save(UserData.name);
			}
		}

	};

	// 2. 兼容只支持globalStorage的浏览器
	// 使用： var storage = getLocalStorage();
	function getLocalStorage(){
		if(typeof localStorage == "object"){
			return localStorage;
		} else if(typeof globalStorage == "object"){
			return globalStorage[location.href];
		} else if(typeof userData == "object"){
			return globalStorage[location.href];
		} else{
			throw new Error("不支持本地存储");
		}
	}
	var storage = getLocalStorage();

	function iLocalStorage(){

	}

	// 高级浏览器的LocalStorage对象
	iLocalStorage.prototype = {
		setItem: function(key, value){
			if(!window.localStorage){
				UserData.setItem(key, value);
			}else{
				storage.setItem(key, value);
			}
		},

		getItem: function(key){
			if(!window.localStorage){
				return UserData.getItem(key);
			}else{
				return storage.getItem(key);
			}
		},

		removeItem: function(key){
			if(!window.localStorage){
				UserData.removeItem(key);
			}else{
				storage.removeItem(key);
			}
		}
	}


	if (typeof module == 'object') {
	    module.exports = new iLocalStorage();
	}else {
	    window.iLocalStorage = new iLocalStorage();
	}

})(window, document);