document.referrer:获取上一页访问页面URL地址
window.location.href:获取当前页面的URL地址
document.referrer====http://127.0.0.1:8020/border/documentreferrer1.html
window.location.href====http://127.0.0.1:8020/border/documentreferrer2.html?way=one
document.referrer:获取上一页访问页面URL地址
window.location.href:获取当前页面的URL地址
document.referrer====http://127.0.0.1:8020/border/documentreferrer1.html
window.location.href====http://127.0.0.1:8020/border/documentreferrer2.html?way=one