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<!DOCTYPE html> <html> <body> <p>单击该按钮可返回 RegExp 模式的文本。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var str = "Visit BEGTUT"; var patt1 = /W3S/g; var res = "The text of the RegExp is: " + patt1.source; document.getElementById("demo").innerHTML = res; } </script> </body> </html>