js 本地存储

功能描述

默认使用 localStorage，降级使用 cookie，支持写入、读取、删除操作。

实现

// 本地存储
var localData = {
    setLocal: function(name, value){
        var name = encodeURIComponent(name),
            value =  encodeURIComponent(value);
        if (typeof Storage != 'undefined') {
            localStorage[name] = value;
        } else {
            var nowDate = new Date().getTime(),
                expiresDate = nowDate + 1000*60*60*24*7,
                expiresDateTime = Date(expiresDate);
            document.cookie = name +'='+ value +'; expires='+ expiresDateTime +'; path=/';
        }
    },
    getLocal: function(name){
        var name = encodeURIComponent(name);
        if (typeof Storage != 'undefined') {
            return localStorage[name];
        } else {
            var name = name + '=';
            var ca = document.cookie.split(';');
            for(var i=0; i<ca.length; i++) {
                var c = ca[i].trim();
                if (c.indexOf(name)==0) return decodeURIComponent(c.substring(name.length,c.length));
            }
            return '';
        }
    },
    delLocal: function(name){
        var name = encodeURIComponent(name);
        if (typeof Storage != 'undefined') {
            localStorage.removeItem(name);
        } else {
            document.cookie = name +'='; expires='+ new Date(0) +'; path=/';
        }
    }
}

使用

// 写入
localData.setLocal('user', 'shuizhongxiong');
// 读取
var code = localData.getLocal('user');
// 删除
localData.delLocal('user');