动态添加的button点击失效

let pages = getCurrentPages()  
let page = pages[pages.length - 1];  
let currentWebview = page.$getAppWebview();  
let titleNView = currentWebview.getStyle().titleNView;  
titleNView.buttons = [  
            {  
                float: 'right',  
                type: 'share'  
            }  
        ];  
currentWebview.setStyle({  
titleNView: titleNView  
})

用onNavigationBarButtonTap检测不到点击