AngularJS之ng-class指令

        <button ng-class="{{blue}}">button1</button>
        $sc.blue = "blue";
        .blue{
             background-color: blue;
        }

        <button ng-class="{true: ‘red‘}[isRed]">button2</button>
        $sc.isRed = true;
        .red{
             background-color: red;
        }

        <button ng-class="{‘yellow‘: isYellow, ‘color‘: color}">button3</button>
        $sc.isYellow = true;
        $sc.color = true;
        .yellow{
             background-color: yellow;
        }
        .color{
             color: #ccc;
        }