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

问题：

My Case: localStorage with key + value that should be deleted when browser is closed and not single tab.我的案例：带有键 + 值的 localStorage 应在浏览器关闭而不是单个选项卡时删除。

Please see my code if its proper and what can be improved:请查看我的代码是否正确以及可以改进的地方：

//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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解决方案：

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