<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>New Page 1</title>
</head><body>
<input type="text" name="T1" id="T1" size="5" onkeyup="if(/^\d+(\.)?(\d+)?$/.test(this.value)==false){alert('请输入数字!');this.value='';}" class="input">
</body></html>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<title>New Page 1</title>
</head><body>
<input type="text" name="T1" id="T1" size="5" onkeyup="if(/^\d+(\.)?(\d+)?$/.test(this.value)==false){alert('请输入数字!');this.value='';}" class="input">
</body></html>
//功能介绍:检查是否为数字
//参数说明:要检查的数字
//返回值:1为是数字,0为不是数字
function fucCheckNUM(NUM)
{
var i,j,strTemp;
strTemp="0123456789";
if ( NUM.length== 0)
return 0
for (i=0;i<NUM.length;i++)
{
j=strTemp.indexOf(NUM.charAt(i));
if (j==-1)
{
//说明有字符不是数字
return 0;
}
}
//说明是数字
return 1;
}
</body>