Question

这是奇怪的。我一直在试图从母物体中指定一个儿童物体的功能,但似乎在卸载功能上已经超出了范围。这些职能指在上载之外的工作,因此只有在上载时才会失败。我可以通过使儿童成为全球目标来解决这一问题,但我正在努力避免这种情况。任何人都知道,我的孩子们为什么在上岸时会失去意义? 通知我称,在窗户上载货时,这种功能也是一样的,而且操作得当。该守则是:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>

<head>
<title>Broken HTA</title>    
<HTA:APPLICATION 
 ID="Broken HTA"
 APPLICATIONNAME="Broken HTA"
 BORDERSTYLE = "flat"
 CAPTION="Yes"
 CONTEXTMENU = "no"
 INNERBORDER = "no"
 MAXIMIZEBUTTON = "no"
 MINIMIZEBUTTON = "yes"
 NAVIGABLE = "No"
 SCROLL = "auto"
 SCROLL FLAT = "Yes"
 SELECTION="no"
 SYSMENU="yes"
 SHOWINTASKBAR="yes"
 SINGLEINSTANCE="yes"
 VERSION = "1.0"
 BORDER="thick"
 >



<script language="javascript" type="text/javascript">

var myparent;

function windowLaunch()
{
    myparent = new parent();
    myparent.getchildvalue();
    window.onbeforeunload = myparent.getchildvalue;
    window.resizeTo(500, 610);
}

function parent()
{
    this.mychild = new childobject("myinput");
    this.getchildvalue = function()
    {
        var tmpval = this.mychild.returnvalue();
    };

}

function childobject(thename)
{
    this.myprop = thename;
    this.returnvalue = function()
    {
        return (document.getElementById(this.myprop).value);
    };
}

</script>
</head>

<body id="thebody" onload="windowLaunch();">
<div id="outerdiv">
        <span title="This Input Box">My Input:</span><br />
        <input id="myinput" style="width: 290px"/>
</div>
</body>

</html>

Answer 1

。电话myoul.getchild Value(>)是优质的,但一旦您指定myother.getchild Value/code>为手,将称为out of context。你们可以证明这一点:



var obj = { val: 42, fn: function(){ alert(this.val) } };
    ref = obj.fn;

alert(obj.fn === ref); // true, so expect the following to do the same thing...

obj.fn(); // 42, so far so good
ref(); // undefined. uh oh...


可以通过总结:

...
window.onbeforeunload = function(){ myparent.getchildvalue(); };
...


或具有约束力:

...
window.onbeforeunload = myparent.getchildvalue.bind(myparent);
...

友情链接