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">单击按钮获取不同类型值的绝对值</p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ var a=Math.abs(7.25); var b=Math.abs(-7.25); var c=Math.abs(null); var d=Math.abs("Hello"); var e=Math.abs(2+3); var x=document.getElementById("demo"); x.innerHTML=a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e; } </script> </body> </html>
运行结果