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<script language = javascript >
var inputvalue = document.getElementById("id").value;
function checkvalue()
{
if( inputvalue == document.getElementById("id").value )
{
alert("unchange!");
}
else
{
alert("change!");
inputvalue = document.getElementById("id").value;
}
}
</script>
<input name = "input1" id = "inputid" type = "text" >
<input type="submit" name="sub" value="提交"/>