AngularJS2中一种button切换效果的实现方法（二）

<button class="btn1" routerLink="ponent1" routerLinkActive="active" type="submit">btn1</button>
<button class="btn2" routerLink="ponent2" routerLinkActive="active" type="submit">btn2</button>

.active {
 background-color: white;
}

<button [class]="{true:'btn1',false:'btn2'}[isChange]" (click)="isChange=true">btn1</button>
<button [class]="{false:'btn1',true:'btn2'}[isChange]" (click)="isChange=false" >btn2</button>

.btn1{
 width: 120px;
 height: 43px;
 border: 1px solid #EEEEEE;
 background: white;
 border-bottom: none;
 text-align: center;
}
.btn2{
 border: 1px solid #EEEEEE;
 border-: 2px solid #238FF9;
 width: 120px;
 height: 42px;
 background: white;
 border-bottom: none;
 text-align: center;
}

<button [class]="{'one':'btn1','two':'btn2','three':'btn3','four':'btn4'}[isChange]" (click)="isChange='one'">btn1</button>
 <button [class]="{'one':'btn1','two':'btn2','three':'btn3','four':'btn4'}[isChange]" (click)="isChange='two'">btn2</button>
 <button [class]="{'one':'btn1','two':'btn2','three':'btn3','four':'btn4'}[isChange]" (click)="isChange='three'">btn3</button>
 <button [class]="{'one':'btn1','two':'btn2','three':'btn3','four':'btn4'}[isChange]" (click)="isChange='four'">btn4</button>

<button [class]="{'one':'btn1','two':'btn2','three':'btn2','four':'btn2'}[isChange]" (click)="isChange='one'">btn1</button>
 <button [class]="{'one':'btn2','two':'btn1','three':'btn2','four':'btn2'}[isChange]" (click)="isChange='two'">btn2</button>
 <button [class]="{'one':'btn2','two':'btn2','three':'btn1','four':'btn2'}[isChange]" (click)="isChange='three'">btn3</button>
 <button [class]="{'one':'btn2','two':'btn2','three':'btn2','four':'btn1'}[