使用angularjs在选择ng-options中添加图标

Question

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 <select 
    name="" 
    id="packageId" 
    class="form-control" 
    ng-model="client.selectedPackage" 
    ng-options="package as package.pM_Name for package in packages" 
    ng-change="changePackage(client.selectedPackage)" 
    required>
         <option value="">Select a package</option>
</select>

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我想在每个选项上添加glyphicons 我试着用class =＆＃34; glyphicons glyphicons-book＆＃34;但它没有用，任何人都可以帮助我

提前感谢..