两个页面交换信息

a.htm
============
<form name=fa>
<input name=A1 onblur="win.document.fb.A1.value=this.value">
<input name="A2" onblur="win.document.fb.A2.value=this.value">
<input name=A3>
</form>
<script>
win = window.open("b.htm")
</script>
b.htm
============
<form name=fb>
<input name=A1>
<input name="A2">
<input name=A3 onblur="opener.document.fa.A3.value=this.value">
</form>