fmpq.com
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> <p id="demo">单击按钮显示不同数值的平方根。</p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ var a=Math.sqrt(0); var b=Math.sqrt(1); var c=Math.sqrt(9); var d=Math.sqrt(64); var e=Math.sqrt(-9); var x=document.getElementById("demo") x.innerHTML=a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e; } </script> </body> </html>
运行结果