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当视口低于条件 CSS 标记中所述的 1100 像素时，如何禁用“external.js”加载？

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=yes, width=device-width">
    <link rel="stylesheet" media="screen" href="style/master.css">
    <link rel="stylesheet" media="screen" href="style/index.css">
    <link rel="stylesheet" media="only screen and (max-width:1100px)" href="style/master1100.css">
    <link rel="stylesheet" media="only screen and (max-width:700px)" href="style/master700.css">
</head>

<body>
...
</body>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
<script src="scripts/external.js"></script>
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