在保存前使用显示预览可以让您在不弄乱页面历史的前提下，尝试更改格式等。
Using Show preview before saving also lets you try format changes and other edits without cluttering up the page history, and has a number of other advantages.
如果你点击浏览器上的前进和后退按钮，浏览器就会根据你看过的页面历史向前或向后进行导航。
We click the browser's back and forward buttons and the browser navigates backward and forward through the history of pages we've seen.
只要用户仍在查看相册页面，历史堆栈对象就会一直存在。
Our history stack object will only exist as long as the user is on the photo gallery page.
应用推荐