<input id=a onblur="check(this)">
<form name=form1>
<input name=b><input name=b><input name=b>
</form>
<script>
function check(src){
for(i=0;i<form1.length;i++){
if(form1.b[i].value==Number(src.value))return;
alert("error");
a.value="";
a.focus();
}
}
</script>
<form name=form1>
<input name=b><input name=b><input name=b>
</form>
<script>
function check(src){
for(i=0;i<form1.length;i++){
if(form1.b[i].value==Number(src.value))return;
alert("error");
a.value="";
a.focus();
}
}
</script>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD><BODY>
<SCRIPT>
function fnCheck(){
var aInput = document.getElementsByName("firstName");
if (aInput && aInput[0].value == aInput[1].value &&
aInput[1].value == aInput[2].value && aInput[2].value == aInput[3].value)
{
alert("相同");
}
}
</SCRIPT>
<INPUT TYPE="text" NAME="firstName">
<INPUT TYPE="text" NAME="firstName">
<INPUT TYPE="text" NAME="firstName">
<INPUT TYPE="text" NAME="firstName">
<INPUT TYPE="button" VALUE="Check" onclick="fnCheck()">
</BODY>
</HTML>