在前端开发过程中，会用到本地缓存，但是由于浏览器对不同规范支持的程度不一样，每次进行使用都要为兼容行花费不少时间。我整理了一个本地存储的组件。
组件特点：
- 可以配置使用localStorage、sessionStorage、cookie、Object，IE低版本支持userData
- 统一的使用接口set、get、remove
- 使用方便，直接引入JS，进行初始化即可
下面是源码:
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(function() { var ua = navigator.userAgent.toLowerCase(); var t = ua.match(/msie ([d.]+)/); var ie = t && t[1]; var useUserData = ie ==6 || ie == 7; var encodeVal = function(value) { return encodeURIComponent(value); }; var decodeVal = function(value) { return decodeURIComponent(value); }; var isCookieEnabled = function() { if(window.navigator.cookieEnabled) { return window.navigator.cookieEnabled; } var key = 'test_cookie_enable', value = 'test' + Math.random(), result = _cookieStorage.set(key, value); if (!result) { return false; } var value2 = _cookieStorage.get(key); _cookieStorage.remove(key); return value == value2; }; var _sessionStorage = { get : function(key) { return sessionStorage.getItem(key) || null; }, set : function(key, value) { sessionStorage.setItem(key, value); }, remove : function(key) { sessionStorage.removeItem(key); } }; var _localStorage = { get : function(key) { return decodeVal(localStorage.getItem(key)) || null; }, set : function(key, value) { value = encodeVal(value); localStorage.setItem(key, value); }, remove : function(key) { localStorage.removeItem(key); } }; var _userDataStorage = { init: function(maxage) { var memory = document.createElement('input'); this.memory = memory; memory.style.display = "none"; memory.style.behavior = "url('#default#userData')"; document.body.appendChild(memory); if(maxage) { var now = +new Date(); var expires = now + maxage * 1000; memory.expires = new Date(expires).toUTCString(); } memory.load('UserDataStorage'); }, get : function (key) { return decodeVal(this.memory.getAttribute(key)) || null; }, set : function(key, value) { value = encodeVal(value); this.memory.setAttribute(key, value); this.memory.save('UserDataStorage'); }, remove : function(key) { this.memory.removeAttribute(key); this.memory.save('_userDataStorage'); } }; var _cookieStorage = { init: function(maxage, path) { this.maxage = maxage; this.path = path; }, set : function(key, value) { var cookie = key + '=' + encodeVal(value); if(this.maxage) cookie += '; max-age=' + this.maxage; if(this.path) cookie += '; path=' + this.path; document.cookie = cookie; }, get : function(key) { var cookies = document.cookie; var reg = new RegExp('(?:^ |)(' + key + ')=([^;]+)'); var value = cookies.match(reg); if(value) { return decodeVal(value[2]); } return null }, remove : function(key) { this.init(0, '/'); this.set(key, ''); } }; var _objectStorage = { init : function() { this.data = {}; }, set : function(key, value) { value = encodeVal(value); this.data[key] = value; }, get : function (key) { return decodeVal(this.data[key]) || null; }, remove : function(key) { delete this.data[key]; } }; /** * 本地存储 * @param {String} type 存储类型 [local,session,cookie,page] * @param {Number} maxage cookie到期时间 单位秒 * @param {String} path 路径 * @return {Object} 具有set、get、remove方法 */ function Storage(type, maxage, path) { var storage; maxage = maxage || ''; path = path || '/'; type = type || 'local'; switch (type) { case 'local' : try { // 禁用cookie、localStorage时访问会报错 storage = window.localStorage ? _localStorage : useUserData ? _userDataStorage : Object; } catch (e) { storage = _objectStorage; } break; case 'session' : try { // 禁用cookie、_localStorage时访问会报错 storage = window.sessionStorage ? _sessionStorage : _objectStorage; } catch (e) { storage = _objectStorage; } break; case 'cookie' : storage = isCookieEnabled() ? _cookieStorage : _objectStorage; break; case 'page' : storage = _objectStorage; } storage.init && storage.init(maxage, path); return storage; } window.Storage = Storage;})(); |
使用例子：
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var storage = new Storage('local'); storage.set('name', '中国人'); var name = storage.get('name'); alert(name); storage.remove('name'); var name = storage.get('name'); alert(name); |
如果觉得有用可以推荐一下，那里实现的有问题，也希望指正。