你好，我是pretty的新的JavaScript的，不知道如何使用它。

hello I'm pretty new at javascript and don't know how to use it.

我要AJAX装载机出现时，页面加载和装载完成后，我想加载器dissapear。任何人都可以发表我一个code是什么？

I want AJAX Loader to appear when a page loads and after loading is finished I want loader to dissapear. Can anyone post me a code for that?

推荐答案

通常这是显示/隐藏一个或两个分区您的内容的顶部完成。你可以从 http://www.ajaxload.info/ 看中加载GIF，让您开始。然后，你要放置一个DIV您的网页上：

Generally this is done by showing/hiding a div or two over the top of your content. You can get a fancy loading gif from http://www.ajaxload.info/ to get you started. Then you'll want to place a DIV on your page:

<div id="loading">
    <p><img src="loading.gif" /> Please Wait</p>
</div>

您会希望这个隐藏在默认情况下，所以你需要添加这个CSS：

You'll want this hidden by default, so you'd need to add this CSS:

#loading { display:none; }

您还希望要设置的显示这一点：

You'd also want to setup the display for this too:

#loading { display:none; position:fixed; left:0; top:0; width:100%; height:100%;
       background-image:url("transparentbg.png"); }

的文件transparentbg.png将是一个25×25的黑色的PNG设定为约80％的不透明。接下来，您将需要一种方式来显示和使用jQuery隐藏这样的：

The file transparentbg.png would be a 25x25 black PNG set to about 80% opaque. Next you would need a way to show and hide this with jQuery:

function showLoading() {
    $("#loading").show();
}

function hideLoading() {
    $("#loading").hide();
}

现在你可以使用这个时候，你需要做的是这样一个查询页面的外部数据：

Now you can use this when you need to do something like querying an external page for data:

showLoading();
$.post("data.php", {var:"foo"}, function(results){
    $("content").append(results);
    hideLoading();
});