点击运行
<!DOCTYPE html> <html> <body> <p>单击按钮循环一段代码五次。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var x = "", i; for (i=0; i<5; i++) { x = x + "数字是：" + i + "<br>"; } document.getElementById("demo").innerHTML = x; } </script> </body> </html>
运行结果
