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一、window.history对象
history.back() 与在浏览器点击后退按钮相同
histroy.forward() 与在浏览器中点击向前按钮相同
history.go() 方法中可以填写参数（表示跳转页面的个数）
由于安全原因javascript不允许修改history里已有的url链接，但可以使用pushState方法往histroy里增加url链接，并且提供popstate事件监测history栈里弹出url。
pushState方法接受三个参数，依次为：state：一个与指定网址相关的状态对象，poststate事件触发时，该对象会传入回调函数。如果不需要这个对象，此处可以填null。title：新页面的标题，但是所有浏览器目前都忽略这个值，因此这里可以填null，url：新的网址，必须与当前页面处在同一个域，浏览器的地址栏将显示这个网址。pushState()可以创建历史，可以配合popstate事件，可以使用history.go(-1)返回到上一个页面。而replaceState不会加入到历史记录里面，用history.go(-1)会跳过当前页面相当于history.go(-2)。
二、监听返回、后退、上一页按钮监听事件
window.addEventListener("popstate",function(e){ alert("监听事件成功"); },false)
虽然监听了后退事件，如果接着按返回也能回到上一个页面，所以需要使用pushState增加一个本页的url，“#”代表本页
function pushHistory(){ var state={ title:"title", url:"#" };
window.history.pushState(state,"title","#"); }
