源代碼
點擊運行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>教程</title> </head> <body> <p>假設 y=5,計算 x=y+2,併顯示結果。</p> <button onclick="myFunction()">點擊這里</button> <p id="demo"></p> <script> function myFunction(){ var y=5; var x=y+2; var demoP=document.getElementById("demo"); demoP.innerHTML="x=" + x; } </script> </body> </html>
運行結果