继续JoelAnair的回答:

为了获得更强的健壮性，使用如下方法:

var el = document.getElementById('targetFrame');

if(el.contentWindow)
{
   el.contentWindow.targetFunction();
}
else if(el.contentDocument)
{
   el.contentDocument.targetFunction();
}

像魅力一样工作:)

IFRAME应该在frames[]集合中。使用像这样的东西

frames['iframeid'].method();

这里有一些需要注意的怪癖。

HTMLIFrameElement.contentWindow is probably the easier way, but it's not quite a standard property and some browsers don't support it, mostly older ones. This is because the DOM Level 1 HTML standard has nothing to say about the window object. You can also try HTMLIFrameElement.contentDocument.defaultView, which a couple of older browsers allow but IE doesn't. Even so, the standard doesn't explicitly say that you get the window object back, for the same reason as (1), but you can pick up a few extra browser versions here if you care. window.frames['name'] returning the window is the oldest and hence most reliable interface. But you then have to use a name="..." attribute to be able to get a frame by name, which is slightly ugly/deprecated/transitional. (id="..." would be better but IE doesn't like that.) window.frames[number] is also very reliable, but knowing the right index is the trick. You can get away with this eg. if you know you only have the one iframe on the page. It is entirely possible the child iframe hasn't loaded yet, or something else went wrong to make it inaccessible. You may find it easier to reverse the flow of communications: that is, have the child iframe notify its window.parent script when it has finished loaded and is ready to be called back. By passing one of its own objects (eg. a callback function) to the parent script, that parent can then communicate directly with the script in the iframe without having to worry about what HTMLIFrameElement it is associated with.

继续JoelAnair的回答:

为了获得更强的健壮性，使用如下方法:

var el = document.getElementById('targetFrame');

if(el.contentWindow)
{
   el.contentWindow.targetFunction();
}
else if(el.contentDocument)
{
   el.contentDocument.targetFunction();
}

像魅力一样工作:)

为了记录，我今天遇到了同样的问题，但这次页面嵌入在对象中，而不是iframe(因为它是XHTML 1.1文档)。下面是它如何处理对象:

document
  .getElementById('targetFrame')
  .contentDocument
  .defaultView
  .targetFunction();

(对不起，很难看的换行，不适合单行)

同样的事情，但更简单的方法将是如何从iframe中的页面刷新父页面。 只需调用父页面的函数来调用javascript函数来重新加载页面:

window.location.reload();

或者直接从iframe中的页面执行此操作:

window.parent.location.reload();

这两个工作。