<input type="text" name=num onblur=check(this)>
<script language="javascript">
var txt =document.num.value;
var indexD = txt.indexOf('.');
var aftStr = txt.substring(indexD +1,txt.length);
if(aftStr.length>2 && indexD > 0)
{
alert("小数位最多两位!");
return false;
}
return true;
}</script>
<script language="javascript">
var txt =document.num.value;
var indexD = txt.indexOf('.');
var aftStr = txt.substring(indexD +1,txt.length);
if(aftStr.length>2 && indexD > 0)
{
alert("小数位最多两位!");
return false;
}
return true;
}</script>
var txt =document.getElementById("num").value;
var thisdecimal = decimal;
var re = /^\d*\.?\d{0,2}$/;
if(thisdecimal!=""){
if (re.exec(thisdecimal) != null){
//alert("right");
}
else
{alert("线路长度限输入数字且最多2位小数!");
document.forms[0].elements[""+thisname+""].focus();
}
}
}