<input
onkeypress="var k=event.keyCode; return k>=48&&k<=57||k==46"
onpaste="return !clipboardData.getData('text').match(/\D/)"
ondragenter="return false"
style="ime-mode:Disabled"
>
onkeypress="var k=event.keyCode; return k>=48&&k<=57||k==46"
onpaste="return !clipboardData.getData('text').match(/\D/)"
ondragenter="return false"
style="ime-mode:Disabled"
>
if(!isNaN(obj.value)
alert("is num");
</script>
实在佩服!