源代碼
點擊運行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>教程</title> </head> <body> <p id="demo">單擊按鈕捨入與“2.5”最接近的整數</p> <button onclick="myFunction()">點我</button> <script> function myFunction(){ document.getElementById("demo").innerHTML=Math.round(2.5); } </script> </body> </html>
運行結果