if(window.localStorage) {
     //alert('yes');
     var storage = window.localStorage;
     //设置localstorage的几种方法
     storage.setItem('name', 'rain');
     storage['a'] = 1;
     storage.b = 2;
     console.log(storage);
     //读取localstorage的几种方法
     console.log(storage['a']);
     console.log(storage.getItem('b'));

    //删除localstorage里面的某个键
    storage.removeItem('name');
    console.log(storage);   

    //获取localstorage的键
    console.log(storage.key(0), storage.key(1));    //a,b

    //清空localstorage
    storage.clear();
    console.log(storage);
}