location和history

// location
console.log(location.href)      //  整个网址
console.log(location.protocal)  // 'https' 'http'
console.log(location.pathname)  // 'learn/199'
console.log(location.host)      //  域名
console.log(location.search)    //  ？后面 
console.log(location.hash)      //  #后面
//history 
history.back()                  // 后退
history.forward()               // 前进