StorageLRU（storage-lru）是LRU缓存实现，可以用在本地存储或者其他存储机制，支持一个类似的接口。
注意：这个库是使用CommonJS风格编写的，如果要在浏览器使用，需要使用Browserify和Webpack类似的工具。
主要特性：
可插拔的离线存储
统计数据
自定义的PurgeComparator
优先级
自动清理
使用：
var StorageLRU = require('storage-lru').StorageLRU;var asyncify = require('storage-lru').asyncify;var lru = new StorageLRU(asyncify(localStorage), { purgeFactor: 0.5, // this controls amount of extra space to purge. purgedFn: function (purgedKeys) { console.log('These keys were purged:', purgedKeys); }});console.log(lru.numItems()); // output 0, assuming the storage is clearlru.setItem('foo', 'bar', {}, function (err) { if (err) { // something went wrong. Item not saved. console.log('Failed to save item: err=', err); }});lru.setItem('fooJSON', {foo: 'bar'}, {json: true}, function (err) { if (err) { // something went wrong. Item not saved. console.log('Failed to save item: err=', err); }});lru.getItem('foo', {json: false}, function (err, value) { if (err) { // something went wrong, for example, can't deserialize console.log('Failed to fetch item: err=', err); return; } console.log('The value of "foo" is: ', value);});lru.removeItem('foo', function (err) { if (err) { // something went wrong. Item not removed. }});var stats = lru.stats();
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