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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 字符串</h1>
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<h2>charAt() 方法</h2>
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<p>charAt() 返回字符串中指定索引（位置）处的字符。</p>
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<p>获取字符串中的第一个字符：</p>
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<p id="demo"></p>
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<script>
let text = "HELLO WORLD";
let letter = text.charAt(0);
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document.getElementById("demo").innerHTML = letter;
</script>
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</body>
</html>
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