例子中怎么有两个</head>
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
</head>
<script type="text/javascript">
function GoForward() {
window.history.forward();
}
</script>
</head>
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