禁止浏览器返回上一页(缓存

   if(window.history && window.history.pushState){
        window.onpopstate=function(){
          window.history.pushState('forward', null)
          window.history.forward(1)
        }
      }
      window.history.pushState('forward', null)
      window.history.forward(1)
      window.history.pushState('','','')