源代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Wfuyu教程(wfuyu.com)</title> </head> <body> <p>点击按钮循环代码5次。</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction(){ var x=""; for (var i=0;i<5;i++){ x=x + "该数字为 " + i + "<br>"; } document.getElementById("demo").innerHTML=x; } </script> </body> </html>
运行结果：