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<html>
<body>
<h1>JavaScript console.groupEnd() 方法</h1>
<p>按键盘上的 F12 可在控制台视图中查看消息。</p>
<script>
console.log("Hello world!");
console.group();
console.log("Hello again, this time inside a group!");
console.groupEnd();
console.log("and we are back.");
</script>
</body>
</html>