本例是一个完全和规范一致的 TodoMVC 实现，只用了 120 行有效的 JavaScript（不包含注释和空行）。

Note that if your web browser is configured to block 3rd-party data/cookies, the example below will not work, as the `localStorage` data will fail to be saved from JSFiddle. You'll have to click on `Edit in JSFiddle` to see the live result.