A page passes value according to url, B page accepts

A page:

    location.href="B.html?name='box'";

Page B:

function GetQueryString(name){
                var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
                var r = window.location.search.substr(1).match(reg);
                if(r!=null)return  unescape(r[2]); return null;

}

var name= GetQueryString("name")

alert(name);