a页面

window.onload = function () {
var data = sessionStorage.getItem("FirstLoad");
      if (data) {
          if (data == "0") {
         sessionStorage.setItem("FirstLoad","1");
         location.reload();
     }
   } else {
     sessionStorage.setItem("FirstLoad","1");
    }
}

 

b页面
sessionStorage.setItem("FirstLoad""0");
history.back();

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