localStorage的速度/成本 [英] Speed/cost of localStorage

问题描述

使用Javascript在localStorage中查找值的速度有多快?

How fast is looking up a value in localStorage with Javascript?

是否有人链接到任何性能测试，这些性能测试指示是否值得在JavaScript对象中缓存数据?还是浏览器已经缓存了从localStorage访问的值?

Does anyone have links to any performance tests that indicate whether or not it is worth caching the data in a JavaScript object? Or does the browser already cache values that are accessed from localStorage anyway?

我对localStorage的Firefox和Chrome实现特别感兴趣.

I am particularly interested in Firefox and Chrome implementations of localStorage.

推荐答案

对于它的价值，这是一个 jsperf测试.

For what it's worth, here is a jsperf test.

在FF7和IE9中，localStorage的基准用法明显比访问常规对象属性要慢得多.当然，这只是一个微基准，不一定反映真实的使用情况或性能 ...

The benchmark usage of localStorage is significantly slower than access of a regular object properties in both FF7 and IE9. Of course, this is just a micro-benchmark, and does not necessarily reflect real-world usage or performance...

从FF 7运行中提取的样本以操作/秒"的形式显示明显较慢"的含义:

Sample pulled from my FF 7 run to show what "significantly slower" means, in ops/second:

            native     local-storage    notes
small set   374,397    13,657           10 distinct items
large set   2,256      68               100 distinct items
read-bias   10,266     342              1 write, 10 reads, 10 distinct items

此外，对可在localStorage中放置的内容有限制. YMMV.

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