returnValue是javascript中html的window对象的属性,目的是返回窗口值,当用window.showModalDialog函数打开一个IE的模式窗口(模式窗口知道吧,就是打开后不能操作父窗口,只能等模式窗口关闭时才能操作)时,用于返回窗口的值,下面举个例子:
1、parent.html
1.<html xmlns="http://www.w3.org/1999/xhtml">
2.<head runat="server">
3. <title></title>
4. <script type="text/javascript">
5. function openNewWeb() {
6. var winValue = window.showModalDialog("WebForm1.aspx", null, "dialogHeight=200px,dialogWidth=200px,center=1");
7. document.getElementById("result").innerText = winValue;
8.
9. }
10. </script>
11.
12.</head>
13.<body>
14. <form id="form1" runat="server">
15. <input id="Button1" type="button" value="button" onclick="openNewWeb()" />
16. <div id="result">
17. </div>
18. </form>
19.</body>
20.</html>
2、child.html
2
.<html xmlns="http://www.w3.org/1999/xhtml">
3.<head runat="server">
4. <title></title>
5.
6. <script type="text/javascript">
7. function returnResult() {
8. window.returnValue = document.getElementById("txtUserName").value;
9. window.close();
10. }
11. </script>
12.
13.</head>
14.<body>
15. <form id="form1" runat="server">
16. <input id="txtUserName" type="text" />
17. <input id="btn" type="button" value="button34" onclick="returnResult()" />
18. </form>
19.</body>
20.</html>
window.showModalDialog("child.htm",null,"dialogWidth:350px;dialogHeight:350px;help:no;status:no");