完整示例代码：
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=GB2312"/>
- <title>正则实现文本框只能输入正整数</title>
- </head>
- <body>
- <input type="text" onkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')"/>
- </body>
- </html>
核心代码：
- <input type="text" onkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')"/>
