基本调用：
1、存储：Catch.setStorage("userName", "angbike", 1*24*60*60);
2、获取：Catch.getStorage("userName");
3、删除特定存储内容：Catch.delStorage("userName");
4、删除全部内容：Catch.delAllStorage();

localStorage简单封装:

Catch = {

    /**
     * localStorage写入
     * @param {Object} key
     * @param {Object} stringVal
     * @param {Object} time
     */
    setStorage: function(key, stringVal, time){
        try{
            if(!localStorage){
                return false;
            }
            if(!time || isNaN(time)){
                time = 60;
            }
            var cacheExpireDate = (new Date() - 1) + time * 1000;
            var cacheVal = {val:stringVal, exp:cacheExpireDate};
            localStorage.setItem(key, JSON.stringify(cacheVal));
        }catch(e){
            console.log(e);
        }
    },
    
    /**
     * localStorage读取
     * @param {Object} key
     */
    getStorage: function(key){
        try{
            if(!localStorage){
                return false;
            }
            var cacheVal = localStorage.getItem(key);
            var result = JSON.parse(cacheVal);
            var now = new Date() - 1;
            if(!result){
                return null;
            }
            if(now > result.exp){
                this.remove(key);                    
                return "";
            }
            return result.val;
        }catch(e){
            //this.remove(key);
            return null;
        }
    },
    
    /**
     * localStorage删除
     * @param {Object} key
     */
    delStorage : function(key){
        if(!localStorage){
            return false;
        }
        localStorage.removeItem(key);
    },
    
    /**
     * localStorage删除
     */
    delAllStorage : function(){
        if(!localStorage){
            return false;
        }
        localStorage.clear();
    }
    
}