function onlyNumber(id)
{
var txt = $(id);
if (txt == null) return; //对象不存在 txt.onkeyup = function () {this.value = this.value.replace(/[^0-9.-]/g,"");};
txt.onblur = txt.onkeyup;
txt.onchange = txt.onkeyup;
if (isIE())
{
txt.ondrop = function () {event.dataTransfer.setData("text",event.dataTransfer.getData("text").replace(/[^0-9.-]/g,""));}
txt.onbeforepaste = function () {clipboardData.setData("text",clipboardData.getData("text").replace(/[^0-9.-]/g,""));}
}
}
这个函数只允许输入数字,没有对数字的大小进行限制,你自己改一下就行了
function check()
{
var value = document.all.name1.value;
if (praseInt(value)>100)
document.all.name1.value = 100;
}
<head>
<title>无标题页</title>
</head>
<body>
<input name="name1" type="text" id="name1" size="60">
<script>
var a=/^[1-9]\d*$/g;
var b=/([^\d]|^0)/g;
var obj=document.getElementById("name1");
obj.onkeyup=function()
{
this.value=this.value.replace(b,"");
var str=this.value.match(a);
if(str!=null){
if(parseInt(str[0])>100)
{
this.value=100;
}
else if(parseInt(str[0])<0)
{
this.value=0;
}
else
{
this.value=str[0];
}}
}
</script>
</body>
</html>