Javascript sessionStorage

Javascript sessionStorage
Assign session Storage in one page
objColl={};
objColl["A"].width= "20";
objColl["A"].height= "20";
sessionStorage.setItem('ProjInfo', JSON.stringify(objColl));
Use SessionStorage in another page
var arrSession = JSON.parse(sessionStorage.getItem('ProjInfo'));
var PAWidth = arrSession["A].width;
var PAHeight = arrSession["A].height;