RUNOOB.COM
源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>单击按钮将代码块循环执行5次。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <script> function myFunction(){ var x="",i; for (i=0;i<5;i++){ x=x + "这个数字是" + i + "<br>"; } document.getElementById("demo").innerHTML=x; } </script> </body> </html>
运行结果