源代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Wfuyu教程(wfuyu.com)</title> </head> <body> <p id="demo">单击按钮给定与“2.5”最接近的整数</p> <button onclick="myFunction()">点我</button> <script> function myFunction(){ document.getElementById("demo").innerHTML=Math.round(2.5); } </script> </body> </html>
运行结果：