<html>
<head>
<title>验证浮点数</title>
<script language=javascript>
function OnBlur(oTextbox,value)
{
//能够匹配"123"、"123."、"123.5"、".5"类型的浮点数
var reFloat=/^/d+/.?/d*$|^/./d+$/
if(!reFloat.test(value))
{
alert("请输入一个浮点数!");
oTextbox.focus();
}
}
</script>
</head>
<body >
<input id="Text1" type="text" value = "aa"onblur = "OnBlur(this,this.value)" />
</body>
</html>