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我正在開發一個使用引導程序作爲UI的angularjs應用程序。我已經從YouTube下載了一個教程，我正在關注並且我面臨的問題是我的圖標沒有顯示出來。引導程序圖標不顯示
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<h1><span class="glyphicon glyphicon-align-left" aria-hidden="true"></span> Hello Plunker!</h1>
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<p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
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