bootstrap tooltips在 angularJS中的使用方法

<div class="s2" ng-init="InitTooltip()">
  <input type="text" ng-pattern="/^(http|https|ftp)\://[a-zA-Z0-9\.\,\?\'\\/\+&amp;%\$\#\=~:_\-\s@]+$/" class="inputwords" id="txtExamination" name="txtExamination" ng-model="csInfo.ExamUrl" placeholder="测验地址">
  <span data-toggle="tooltip" data-placement="" data-html="true" title="1、点击《新建测验》按钮 <br/> 2、测验创建完成后，点击页面右上角《共享》按钮>点击《复制》按钮 <br/> 3、把复制的url粘贴到此处即可" style="cursor: pointer;">
   <i class="fa fa-question-circle-o examSpan"></i>
  </span>
  <span style="margin-left: 88px; width: 8px;"> <a target="_blank" href="https://forms.office./Pages/DesignPage.aspx">创建测验</a></span>
</div>

    $scope.InitTooltip = function() {
      //初始化tips提示控件
      $("[data-toggle='tooltip']").tooltip();
    };

/控制弹出层颜色和大小/
.tooltip-inner {
  background: #fafafa !important;
  text-align: left !important;
  color: #363636 !important;
  border: 1px solid #dedede;
  max-width: 400px !important;
  padding: 4px;
}

/控制小三角透明度/
.tooltip-arrow{
  border-bottom-color: #ffffff !important;
  opacity: 0.3;
}