<script>
var prevpage;
prevpage=1
</script>
<script>document.write(prevpage); </script>
<script>alert(document.body.innerHTML); </script>
var prevpage;
prevpage=1
</script>
<script>document.write(prevpage); </script>
<script>alert(document.body.innerHTML); </script>
你的代码没用啊!还是不能实现!