为什么javascript找不到下面定义的div呢? [英] Why can't javascript find a div that is defined below it?
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问题描述
这有效:
<html>
<body>
<div id="bla"></div>
<script type="text/javascript">
var mybla = document.getElementById('bla')
</script>
</body>
</html>
这不是:
<html>
<body>
<script type="text/javascript">
var mybla = document.getElementById('bla')
</script>
<div id="bla"></div>
</body>
</html>
mybla此时为空。哎呀。我怎样才能做到这一点?谢谢!!!
(是的,我希望脚本下面的div)
mybla is null at this point. argh. How can I make this work? Thanks!!! (and yes, I want the div below the script)
推荐答案
因为DOM还没有完全加载。如果要将代码置于HTML之上,则需要将代码放在 onload
处理程序中。像这样:
Because the DOM isn't fully loaded yet. You need to put your code in an onload
handler if you want it above the HTML. Like this:
<script type="text/javascript">
window.onload = function() {
var mybla = document.getElementById('bla');
}
</script>
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