fmpq.com
源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Fmpq教程(fmpq.com)</title> </head> <body> <p>全局变量计数。</p> <button type="button" onclick="myFunction()">计数!</button> <p id="demo">0</p> <script> var counter = 0; function add() { return counter += 1; } function myFunction(){ document.getElementById("demo").innerHTML = add(); } </script> </body> </html>
运行结果