How to delete a localStorage item when the browser window/tab is closed?

問題：

My Case: localStorage with key + value that should be deleted when browser is closed and not single tab.我的案例：帶有鍵 + 值的 localStorage 應在瀏覽器關閉而不是單個選項卡時刪除。

Please see my code if its proper and what can be improved:請查看我的代碼是否正確以及可以改進的地方：

//create localStorage key + value if not exist
if(localStorage){
   localStorage.myPageDataArr={"name"=>"Dan","lastname"=>"Bonny"}; 
}

//when browser closed - psedocode
$(window).unload(function(){
  localStorage.myPageDataArr=undefined;
});

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解決方案：

參考一： https://en.stackoom.com/question/figW
參考二： https://stackoom.com/question/figW