W3School TIY
编辑您的代码：
<!DOCTYPE html> <html> <body> <p>点击下面的按钮，将代码块循环五次：</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 + "The number is " + i + "<br>"; } document.getElementById("demo").innerHTML=x; } </script> </body> </html>
查看结果: