下面是angular官網上講解filter的程式碼，有些地方沒看懂，辛苦各位大神賜教了。

<p ng-init="friends = [{name:'John', phone:'555-1276'},
                         {name:'Mary', phone:'800-BIG-MARY'},
                         {name:'Mike', phone:'555-4321'},
                         {name:'Adam', phone:'555-5678'},
                         {name:'Julie', phone:'555-8765'},
                         {name:'Juliette', phone:'555-5678'}]"></p>

Search: <input ng-model="searchText">
<table id="searchTextResults">
  <tr><th>Name</th><th>Phone</th></tr>
  <tr ng-repeat="friend in friends | filter:searchText">
    <td>{{friend.name}}</td>
    <td>{{friend.phone}}</td>
  </tr>
</table>
<hr>
Any: <input ng-model="search.$"> <br>
Name only <input ng-model="search.name"><br>
Phone only <input ng-model="search.phone"><br>
Equality <input type="checkbox" ng-model="strict"><br>
<table id="searchObjResults">
  <tr><th>Name</th><th>Phone</th></tr>
  <tr ng-repeat="friendObj in friends | filter:search:strict">
    <td>{{friendObj.name}}</td>
    <td>{{friendObj.phone}}</td>
  </tr>
</table>

介面顯示效果：

當勾選Equality時，下面的內容不會顯示出來

程式碼中對應的是

不懂它的filter:search:strict是怎麼運作的？為什麼什麼都不能顯示了？