我是直接在widgets的breadcrumbs.php文件里面改

public function run()
{
    if (empty($this->links)) {
        return;
    }
    $links = [];
    if ($this->homeLink === null) {
        $links[] = $this->renderItem([
            'label' => Yii::t('yii', '首页'),
            'url' => Yii::$app->homeUrl,
        ], $this->itemTemplate);
    } elseif ($this->homeLink !== false) {
        $links[] = $this->renderItem($this->homeLink, $this->itemTemplate);
    }
    foreach ($this->links as $link) {
        if (!is_array($link)) {
            $link = ['label' => $link];
        }
        $links[] = $this->renderItem($link, isset($link['url']) ? $this->itemTemplate : $this->activeItemTemplate);
    }
    echo Html::tag($this->tag, implode('', $links), $this->options);
}