<select> 元素可以有一个 multiple 属性，这种情况下它将填充一个数组而不是选择单个值。
将复选框替换为 <select multiple>：
App
<h2>口味</h2>
<select multiple bind:value={flavours}>
{#each ['cookies and cream', 'mint choc chip', 'raspberry ripple'] as flavour}
<option>{flavour}</option>
{/each}
</select>注意，我们可以省略 <option> 上的 value 属性，因为值与元素的内容完全相同。
按住
control键（在 MacOS 上是command键）可以选择多个选项。
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<script>
let scoops = $state(1);
let flavours = $state([]);
const formatter = new Intl.ListFormat('en', { style: 'long', type: 'conjunction' });</script>
<h2>Size</h2>
{#each [1, 2, 3] as number}<label>
<input
type="radio"
name="scoops"
value={number} bind:group={scoops}/>
{number} {number === 1 ? 'scoop' : 'scoops'}</label>
{/each}<h2>Flavours</h2>
{#each ['cookies and cream', 'mint choc chip', 'raspberry ripple'] as flavour}<label>
<input
type="checkbox"
name="flavours"
value={flavour} bind:group={flavours}/>
{flavour}</label>
{/each}{#if flavours.length === 0}<p>Please select at least one flavour</p>
{:else if flavours.length > scoops}<p>Can't order more flavours than scoops!</p>
{:else}<p>
You ordered {scoops} {scoops === 1 ? 'scoop' : 'scoops'} of {formatter.format(flavours)}</p>
{/if}