在页面加载之前运行JavaScript函数（设置适当大小的背景） [英] Running JavaScript function before page load (setting background of appropriate size)
问题描述
我有一个图像背景，无论用户的分辨率如何，我希望它始终可见。因此，我希望能够在开始之前确定分辨率是什么，并在页面加载之前设置适当的背景图像文件。有可能吗？
I've got an image background which content I want to be always visible, no matter what is the user's resolution. Therefore, I want to be able to determine what is the resolution and set appropriate background image file before page loads, on the very beginning. Is it possible somehow?
推荐答案
最早可以运行Javascript函数来访问DOM（无需等待页面加载）是在打开< body> 标记后立即放置< script> 标记。
The earliest point at which you can run a Javascript function with access to the DOM (without waiting for page load) is by placing a <script> tag right after the opening <body> tag.
< head> 内的脚本会在此之前运行，但是赢了无法访问页面上的元素。
Scripts inside the <head> will run before this occurs, but there won't be access to the elements on the page.
试用此代码
<body>
<script type="text/javascript">
alert("Some elements shouldn't even be visible when this shows");
</script>
... rest of the page
</body>
请参阅示例，包含一些 Gangsta Lipsum 文字。
See this example with some Gangsta Lipsum text.
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