源代碼
點擊運行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>教程</title> </head> <body> <p>單擊按鈕將代碼塊循環執行5次。</p> <button onclick="myFunction()">點我</button> <p id="demo"></p> <script> function myFunction(){ var x="",i; for (i=0;i<5;i++){ x=x + "這個數字是" + i + "<br>"; } document.getElementById("demo").innerHTML=x; } </script> </body> </html>
運行結果