本地存储/会话存储不在本地文件系统的IE中工作

Question

此代码在Chrome和Firefox中运行良好，但在Edge和IE中运行相同时失败。为什么呢？

if (typeof(Storage) !== "undefined") {
  localStorage.setItem("lastname", "Smith");
  document.getElementById("result").innerHTML = localStorage.getItem("lastname");
} else {
  document.getElementById("result").innerHTML = "Sorry, your browser does not support Web Storage...";
}

<div id="result"></div>