fmpq.com
源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> <p id="demo">单击按钮显示PI和2*PI的余弦值。</p> <button onclick="myFunction()">点我</button> <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>
运行结果