我的引导轮播代码不起作用

我正在尝试制作一个滑块，它不工作，我认为我的按钮有问题，有人能告诉我为什么吗?我是新来的，所以我不知道怎么了....

这是我的代码:

`<head>
<link rel="stylesheet" href="bootstrap/css/bootstrap.css">
</head>
<body>
<div id="carousel-example-generic" class="carousel slide" data-  ride="carousel">
<ol class="carousel-indicators">
    <li data-target="#carousel-example-generic" data-slide-to="0"      class="active"><li>
    <li data-target="#carousel-example-generic" data-slide-to="1"><li>
    <li data-target="#carousel-example-generic" data-slide-to="2"><li>
</ol>   
<div class="carousel-inner">
    <div class="item active">
        <img src="http://placehold.it/600x400" alt="...">
        <div class="carousel-caption">
        </div>
    </div>
    <div class="item">
        <img src="http://placehold.it/600x400" alt="">
        <div>
        ...
        </div>
    </div>
    <div class="item">
        <img src="http://placehold.it/600x400" alt="">
        <div>
        ...
        </div>
    </div>
</div>
<a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
    <span class="glyphicon glyphicon-chevron-left"></span>
</a>
<a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
    <span class="glyphicon glyphicon-chevron-right"></span>
</a>
</div>
<script src="js/jquery.js"></script>
<script src="js/bootstrap.js"></script>
</body>`

下面是工作代码http://plnkr.co/edit/Xt0EhyVFNTgU3i8rvxHz?p=preview

<!doctype html>
<head>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
</head>
<body>
  <div id="carousel-example-generic" class="carousel slide" data-ride="carousel">
    <!-- Indicators -->
    <ol class="carousel-indicators">
      <li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
      <li data-target="#carousel-example-generic" data-slide-to="1"></li>
      <li data-target="#carousel-example-generic" data-slide-to="2"></li>
    </ol>
    <!-- Wrapper for slides -->
    <div class="carousel-inner" role="listbox">
      <div class="item active">
        <img src="http://placehold.it/600x400" alt="...">
      </div>
      <div class="item">
        <img src="http://placehold.it/600x400" alt="...">
      </div>
      <div class="item">
        <img src="http://placehold.it/600x400" alt="...">
      </div>
    </div>
    <!-- Controls -->
    <a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
      <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
      <span class="sr-only">Previous</span>
    </a>
    <a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
      <span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
      <span class="sr-only">Next</span>
    </a>
  </div>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
</body>

我不知道为什么你有单引号

`<head>
</body>`

和

'data-  ride='

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