<pre class="shiki github-dark shaku"><code>window.myLocalStorage = { getItem(key) { // your code here let data = window.localStorage.getItem(key); if(!data)return null; data = JSON.parse(data); if(data.maxAge &amp;&amp; (data.maxAge &lt;= Date.now())) { this.removeItem(key); return null; } return data.value; }, setItem(key, value, maxAge) { // your code here if(maxAge === 0)return; let data = { value:value, } if(maxAge)data.maxAge = Date.now() + maxAge; window.localStorage.setItem(key, JSON.stringify(data)); }, removeItem(key) { // your code here window.localStorage.removeItem(key); }, clear() { // your code here window.localStorage.clear(); }}</code></pre>

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localStorage is a simple and handy client-side storage, but you should avoid using it because it is synchronous. Also Safari's ITP actually deletes cl…