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<!DOCTYPE html> <html> <body> <p>单击该按钮可显示不同数字的正弦值。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var a = Math.sin(3); var b = Math.sin(-3); var c = Math.sin(0); var d = Math.sin(Math.PI); var e = Math.sin(Math.PI / 2); var x = a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e; document.getElementById("demo").innerHTML = x; } </script> </body> </html>