A.changeData:function (event){}B.changeData:function (){}C.changeData(){}D.changeData =>{}
A.点击事件v-on:clickB.点击事件@clickC.键盘事件@keyup.enter
A.<a v-bind:class="{active:true}"></a>B.<img v-bind:src="{active:true}"/>C.<a :class="{active:true}"></a>