javascript - 从html页面内部更新父变量

我正在尝试更新html页面内的父var a我正在硬编码，然后在外部警告它，但值没有改变。
这在我的content.js里面

var a;
function popUpWindow() {
    a="Nothing";
    alert(a);// Displays "Nothing"
    myWindow = window.open("Accept", "myWindow", "width=450, height=300");
    myWindow.document.write(
      "<html>"+
      "<head>"+
        "<script> function closeWindow(){parent.a =\"Something\"; alert(\"a has been updated\");  window.close();}</script>"+
      "</head>"+
      "<body>"+
          "<form>"+
              "<div id=leadinformation>"+
                  "<p id=titleParagraph>You are about to create a new Lead:</p>"+
                  "First Name....."+ "<input type=text id=firstname value="+firstname+">" +"<br>"+
                  "Last Name....."+ "<input type=text id=lastname value="+lastname+">" +"<br>"+
                  "Title:..............."+ "<input type=text id=position value="+positions[0]+">" +"<br>"+
                  "Company:......"+ "<input type=text id=company value="+companies[0]+">" +"<br>"+
                  "Email:............"+ "<input type=text id=email value="+email+">" +"<br>"+
                  "Phone:..........."+ "<input type=text nid=phonenumber value="+phonenumber+">" +"<br>"+"<br>"+
              "<div>"+

              "<button id=Accept onClick=closeWindow() >Accept</button>"+
              "<button id=Close onClick=closeWindow() >Close</button>"+
          "</form>"+
          "</div>"+
      "</body>"+
      "</html>"
    );

    myWindow.document.getElementById('Accept').onclick=addToLeads;
    myWindow.document.getElementById('Close').onclick=Close;
}

function Close() {
    alert(a);
    //Displays "Nothing" (Should have been "Soomething")
}

在html页面中，我将parent.a设置为“Something”，然后alert(a)显示“Something”。
然后，我再次在alert(a)函数内部Close()，它在html页面外部，但现在alert(a)再次显示“Nothing”。
你知道这是什么原因吗？

最佳答案

将子函数中的parent.a更改为a：

"<head>"+
        "<script> function closeWindow(){a =\"Something\"; alert(\"a has been updated\");  window.close();}</script>"+
"</head>"+

HTML页面

javascript - 从html页面内部更新父变量