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<!DOCTYPE html> <html> <body> <p>点击按钮显示PI和2*PI的余弦值。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var a = Math.cos(Math.PI); var b = Math.cos(2 * Math.PI); document.getElementById("demo").innerHTML = a + "<br>" + b; } </script> </body> </html>