<script>
function check()
{
if(!isNum(f1.ti.value)&&(f1.ti.value>0)){code}
else{alert("error")}
}
</script>
<form name="f1">
<input type=text name="t1" onblur="check()">
</form>
function check()
{
if(!isNum(f1.ti.value)&&(f1.ti.value>0)){code}
else{alert("error")}
}
</script>
<form name="f1">
<input type=text name="t1" onblur="check()">
</form>
</head><body>
<script>
function check()
{
if(f1.t1.value>0){alert("")}
else{alert("error")}
}
</script>
<form name="f1">
<input type=text name="t1" onblur="check()">
</form></body></html>
</head><body>
<script>
function check()
{
var n = parseInt(f1.t1.value);
if(isNaN(n) || n<=0)
alert("error");
else
alert("ok");
}
</script>
<form name="f1">
<input type=text name="t1" onblur="check()">
</form></body></html>
functon check(){
s=txt.value;
if(s.match(/^[1-9]\d*$/)==null)
alert("不是大于0的数字");
else
alert("大于0的数字");
}
</script>
<input type=text id="txt" onblur="check()">