记一次网页挽留框功能实现

history.pushState(null, null, document.URL),
window.addEventListener("popstate", (function() {
                //retainModel();  展示内容 
                //clickCount  触发条件
        clickCount++,  
        clickCount < 3 ? history.pushState(null, null, document.URL) : history.back()
    }
));