var storage = require('./arno-storage.js');
var localStorage =new storage();
var cookie =new storage('cookie');
var lru =new storage('lru');-
.get(key) 取
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.put(key, value, expires) 设置
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.remove(key) 删除
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.clear() 清空
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.expires(key, seconds) 设有效期 key已存的