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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 正则表达式</h1>
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<p>如果设置了 "i" 修饰符，则 ignoreCase 属性返回 true，否则返回 false：</p>
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<p id="demo"></p>
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<script>
let text = "Visit W3School!";
let pattern = /W3S/i;
let result = pattern.ignoreCase;
document.getElementById("demo").innerHTML = result;
</script>
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</body>
</html>
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