我正在使用Nebularin angular 2，我正在使用stepper四个步骤，如何使用步骤的按钮移动到任何所需的步骤？之前没有选择步骤 ?，例如 from step 1to step 4或 from step 1to step 3，但它不允许我执行这些操作。
对于此示例，我将使用文档中的代码。nbstepper 组件
import { Component } from '@angular/core';
@Component({
template: `
<nb-card>
<nb-card-body>
<nb-stepper orientation="horizontal" disableStepNavigation>
<nb-step [label]="labelOne">
<ng-template #labelOne>First step</ng-template>
<h4>Step content #1</h4>
<p class="lorem">
Lorizzle ipsum dolizzle stuff fizzle, consectetuer adipiscing break it down.
Nullizzle sapien velizzle, my shizz pimpin', shizzle my nizzle crocodizzle shut the shizzle up,
gravida vizzle, dang.
</p>
<button class="prev-button" nbButton disabled nbStepperNext>prev</button>
<button class="next-button" nbButton nbStepperNext>next</button>
</nb-step>
<nb-step [label]="labelTwo">
<ng-template #labelTwo>Second step</ng-template>
<h4>Step content #2</h4>
<p class="lorem">
Lorizzle ipsum dolizzle stuff fizzle, consectetuer adipiscing break it down.
Nullizzle sapien velizzle, my shizz pimpin', shizzle my nizzle crocodizzle shut the shizzle up,
gravida vizzle, dang.
</p>
<button class="prev-button" nbButton nbStepperPrevious>prev</button>
<button class="next-button" nbButton nbStepperNext>next</button>
</nb-step>
<nb-step label="Third step">
<h4>Step content #3</h4>
<p class="lorem">
Lorizzle ipsum dolizzle stuff fizzle, consectetuer adipiscing break it down.
Nullizzle sapien velizzle, my shizz pimpin', shizzle my nizzle crocodizzle shut the shizzle up,
gravida vizzle, dang.
</p>
<button class="prev-button" nbButton nbStepperPrevious>prev</button>
<button class="next-button" nbButton nbStepperNext>next</button>
</nb-step>
<nb-step [label]="labelFour">
<ng-template #labelFour>Fourth step</ng-template>
<h4>Step content #4</h4>
<p class="lorem">
Lorizzle ipsum dolizzle stuff fizzle, consectetuer adipiscing break it down.
Nullizzle sapien velizzle, my shizz pimpin', shizzle my nizzle crocodizzle shut the shizzle up,
gravida vizzle, dang.
</p>
<button class="prev-button" nbButton nbStepperPrevious>prev</button>
<button class="next-button" nbButton disabled nbStepperNext>next</button>
</nb-step>
</nb-stepper>
</nb-card-body>
</nb-card>
`,
styleUrls: ['./stepper-disabled-step-nav.component.scss'],
})
export class StepperDisabledStepNavComponent {}