<html><body><h1>Document 对象</h1><h2>document.getElementsByName 方法</h2>猫：<input name="animal" type="checkbox" value="Cats">狗：<input name="animal" type="checkbox" value="Dogs"><p>选中 name="animal" 的复选框：</p><script>const collection = document.getElementsByName("animal");for (let i = 0; i < collection.length; i++) { if (collection[i].type == "checkbox") { collection[i].checked = true; }}</script></body></html>