解决同一页面jQuery多个版本冲突

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>jQuery测试页-111cn.net</title>
</head>
<body>
    <!-- 引入 jquery 1.8.0 -->
    <script type="text/javascript" src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
    <script type="text/javascript">
        var $180 = $;
    </script>
    <!-- 引入 jquery 1.9.0 -->
    <script type="text/javascript" src="http://code.jquery.com/jquery-1.9.0.min.js"></script>
    <script type="text/javascript">
        var $190 = $;
    </script>
    <!-- 引入 jquery 2.0.0 -->
    <script type="text/javascript" src="http://code.jquery.com/jquery-2.0.0.min.js"></script>
    <script type="text/javascript">
        var $200 = $;
    </script>

    <script type="text/javascript">
        console.log($180.fn.jquery);
        console.log($190.fn.jquery);
        console.log($200.fn.jquery);
    </script>
</body>
</html>

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