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<!DOCTYPE html> <html> <body> <p>如果设置了“i”修饰符，则 ignoreCase 属性返回 true，否则返回 false。</p> <p>点击按钮检查是否设置了“i”修饰符。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var str = "Visit BEGTUT!"; var patt1 = /W3S/i; var res = patt1.ignoreCase; document.getElementById("demo").innerHTML = res; } </script> </body> </html>