在下拉菜单中的angular应用程序中显示JSON数据

你好，我有一个php文件在远程服务器上运行，它获取类别列表并以JSON格式存储它们。该文件名为index.php（这是输出）：

[   {"category":"Accounting Services"},
    {"category":"Appliances Major Repair & Services"},
    {"category":"Auto Glass Window & Repair"},
    {"category":"Auto Paint & Repair"},
    {"category":"Bail Bonds"},
    {"category":"Bus Rent & Charter"},
    {"category":"Car Wash & Polish"},
    {"category":"Carpet & Rug Cleaners"},
    {"category":"Carpet & Rug Dyers"},
    {"category":"Computer Repair"},
    {"category":"Dentists"},
    {"category":"Electric Contractors"},
    {"category":"Elevator Repair"},
    {"category":"Florists"},
    {"category":"Furniture Upholstery"},
    {"category":"Garage Door Repair"},
    {"category":"Garbage Removal & Rubbish"},
    {"category":"Gymnasiums & Fitness Clubs"},
    {"category":"Handyman"},
    {"category":"Heating & Air Conditioning"},
    {"category":"Landscape Contractors & Designers"},
    {"category":"Lawyers - Bankruptcy Law"},
    {"category":"Lawyers - Domestic Relations & Family Law"},
    {"category":"Lawyers - DUI & Traffic Law"},
    {"category":"Limousine Rental"},
    {"category":"Locksmiths"},
    {"category":"Maid & Butler Services"},
    {"category":"Massage Therapy & Therapists"},
    {"category":"Moving & Storage - Home or Office"},
    {"category":"Notaries"},
    {"category":"Painting Contractors"},
    {"category":"Party Equipment & Supplies Sales & Rent"},
    {"category":"Party Planning Services"},
    {"category":"Personal Fitness Trainers"},
    {"category":"Pest Control Services"},
    {"category":"Physical Therapy & Therapists"},
    {"category":"Physicians & Surgeons Chiropractic"},
    {"category":"Plumbing Contractors"},
    {"category":"Real Estate Agents"},
    {"category":"Rent & Lease Home Furniture"},
    {"category":"Rent & Lease Office Furniture"},
    {"category":"Roofing Contractors"},
    {"category":"Security Guard & Patrol Services"},
    {"category":"Snow Removal Services"},
    {"category":"Tailors & Alterations"},
    {"category":"Tax Return Consultants"},
    {"category":"Taxicabs & Transportation Service"},
    {"category":"Television & Radio Service & Repair"},
    {"category":"Test Spin"},
    {"category":"Towing & Road Side Services"},
    {"category":"Tree Removal"},
    {"category":"Tutoring"},
    {"category":"Veterinarian Services"},
    {"category":"Window Repair & Installation"}
]

我试图获取这个JSON数据中的类别，并通过AJAX调用将其显示在一个有角度的应用程序的下拉菜单中。以下是我的main.js文件中AJAX调用的代码：

$http.get('http://test.s17.sevacall.com/abhas/index.php').
    success(function(data, status, headers, config) {
      console.log(data);//debug
      $scope.categories = data;
    }).
    error(function(data, status, headers, config) {
      //log error
    });

以下是我的html文件代码，该文件在下拉菜单中显示AJAX调用的数据：

<div ng-controller="MainCtrl">
    <span class="dropdown" on-toggle="toggled(open)">
        <a href class="dropdown-toggle">
            Click me to see some awesome things!
        </a>
        <ul class="dropdown-menu">
            <li ng-repeat="category in categories track by $index"> <!--fix this expression-->
                <a href>{{category}}</a>
            </li>
        </ul>
    </span>
</div>

我的问题是json数据在下拉菜单中打印，但下拉菜单逐字符显示json数据，而不仅仅是下拉菜单每行上的类别。它的格式不正确。如果我能得到任何关于如何解决这个问题的帮助，并让我的下拉菜单只显示类别，我将不胜感激。

提前感谢！