菜鸟教程在线编辑器

AI 编程工具
 
                <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
</head>
<body>

<h1>JavaScript 字符串</h1>
<h2>中括号</h2>

<p>中括号 [] 返回字符串中对应索引位置的字符：</p>

<p id="demo"></p>

<script>
const name = "RUNOOB";
let letter = name[2];

document.getElementById("demo").innerHTML = letter;
</script>

</body>
</html>
              