Question

表单如何只能输入数字

表单如何只能输入数字,
或者中文

Answer 1

<input onkeyup="value=value.replace(/[^1234567890-]+/g,'')">
<input onkeyup="value=value.replace(/[ -~]/g,'')">

Answer 2

<input type="text" onkeydown="inputOnlyNum(event);" onkeypress="checkIfNum(event);">
<script language="javascript">
var keyIsNum = true;
function inputOnlyNum(myEvent)
{
var keys=myEvent.keyCode;
if (!((keys>=48&&keys<=57)||(keys>=96&&keys<=105)||( keys==8 )||(keys==46)||(keys==37)||(keys==39)||(keys==13)||(keys==229)
))
{
keyIsNum = false;
}
else
{
keyIsNum = true;
}

}
function checkIfNum(myEvent)
{
if(!keyIsNum)
{
if(document.all)
myEvent.returnValue=false;//ie
else
myEvent.preventDefault();//ff
}

}
</script>