Javascript停止激活

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所以我的JavaScript已莫名其妙地停止工作。我不太確定我做了什麼，但任何幫助將不勝感激。謝謝！我真的應該用VC，我想這是敲響了警鐘Javascript停止激活

<head style="overflow-x: hidden"> 
    <title>Dupont Studios</title> 
    <link href='http://fonts.googleapis.com/css?family=Oxygen:300' rel='stylesheet' type='text/css'> 
    <script src="http://code.jquery.com/ui/1.9.2/jquery-ui.js"></script> 
    <script type="text/javascript" src="waypoints.js"></script> 
    <script type="text/javascript" src="jquery-1.9.1.js"></script> 

    <meta name="viewport" content="width=device-width, initial-scale=1"> 
    <link rel="stylesheet" media="only screen and (max-width: 400px)" href="mobile.css" /> 
    <link rel="stylesheet" media="only screen and (min-width: 401px)" href="style.css" /> 
    <script language="javascript" type="text/javascript"> 
     $(function() { 
     // Do our DOM lookups beforehand 
     var nav_container = $(".nav-container"); 
     var nav = $("nav"); 
     nav_container.waypoint({ 
     handler: function(direction) { 
     nav_container.toggleClass('sticky', direction=='down'); 

     } 
     }); 
     }); 

    </script> 
    <script language="javascript" type="text/javascript"> 
     $("li.nav-item").click(function() { 
     $("html, body").animate({ 
     scrollTop: $($(this).children().attr("href")).offset().top + "px"}, {duration: 500, easing: "swing" 
     }); 
     return false; 
     }); 

    </script> 
</head>

錯誤：

Uncaught ReferenceError: jQuery is not defined jquery-ui.js:351 
Uncaught TypeError: undefined is not a function waypoints.js:25 
Uncaught TypeError: Object [object Object] has no method 'waypoint'

來源

2013-07-09 nictoriousface

你會得到什麼錯誤？你正在用開發人員工具進行調試嗎？ – j08691

當您使用任何網絡軟件時，您應該始終打開開發者控制檯。即使你不知道錯誤意味着什麼，發生這種錯誤對幫助這裏的人會有巨大的幫助。 – Pointy

對不起，現在更新錯誤 – nictoriousface