怎么样保证在表单中输入的字符只能是数字的，谢谢了，给分！

解决方案 »

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href="只允许输入数字.files/03.css" type=text/css rel=stylesheet></HEAD>
<BODY><TEXTAREA id=ok2 rows=7 cols=100></TEXTAREA>
<DIV align=center><INPUT onmousedown=runEx() title="???????<input"
onclick="ok2.select();document.execCommand('Copy')" type=image
src="只允许输入数字.files/02.gif">
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re=/<\/script>/gi;n=n.replace(re,"`vS2`#0000ff></"+"script>`1`1")
re=/<body/gi;n=n.replace(re,"`vS2`\"\"style=\"background-color:#99CCFF\"><body`1`1")
re=/<\/body>/gi;n=n.replace(re,"`vS2`\"\"style=\"background-color:#99CCFF\"></body>`1`1")
re=/(var|if|else|for)/g;n=n.replace(re,"`vS2`#0000ff>$1`1`1")
re=/(function\s\S+\s*$\S*$|{|})/g;n=n.replace(re,"`vS2`#ff0000>$1`1`1")
re=/($|$)/g;n=n.replace(re,"`vS2`#f00fff>$1`1`1")
re=/\/\/(\S*)/g;n=n.replace(re,"`vS2`#00aa00>\/\/$1`1`1")re=/</g;n=n.replace(re,"<")
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var winEx=window.open("", "winEx","status=yes,menubar=yes,scrollbars=yes,resizable=yes");
winEx.document.open("text/html","replace");winEx.document.write(ok2.value);winEx.document.close()}
</SCRIPT>
</DIV></BODY></HTML>
<input type=text size=8 onkeyup=math3(this) onBlur=math3(this)><script>
function math3(n){
n.value=n.value.replace(/\D/g,'')
}
</script>
<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>只输入数字的几种方法</title>
<style>
td{font-size:12px}
</style>
</head><body><table border="1" width="90%" bordercolor="#000000" cellspacing="0" cellpadding="0" bordercolorlight="#000000" bordercolordark="#FFFFFF">
  <tr>
    <td width="100%"><input onkeyup="this.value=this.value.replace(/\D/g,'')"
      onafterpaste="this.value=this.value.replace(/\D/g,'')">
     <br>
     try:<input onkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')"></td>
  </tr>
  <tr>
    <td width="100%"><input name=txt1 onchange="if(/\D/.test(this.value)){alert('只能输入数字');this.value='';}"><br>
    try:<input name=txt1 onchange="if(/\D/.test(this.value)){alert('只能输入数字');this.value='';}"></td>
  </tr>
  <tr>
    <td width="100%"><input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')"><br>
    try:<input onkeyup="if(isNaN(value))execCommand('undo')" onafterpaste="if(isNaN(value))execCommand('undo')"></td>
  </tr>

</table></body></html>