如果你想要一些内置的东西，你可以使用document.referrer来获取以前的URL。但是它可能不可靠，无法满足你的需求。更多信息here，here和here
另一个非常简单的选择是将当前页面名称存储在会话存储中，读取它，然后决定下一步做什么。

//retrieve the previous page
var previouspage = window.sessionStorage.getItem("page"):
// if thee is no previous page you are on the first page
if (previousPage == undefined){
 //do something if you want, this means it's the first page the user is seeing
 }
//get current page address
var currentPage = window.location.href;
//store it
window.sessionStorage.setItem("page",currentPage); 
//check if the previous page is the one you wanted.
if (previousPage == "the_page_you_wanted"){
 // do something.
 }

LocalStorage vs SessionStorage