为什么 DOM 元素为空? [英] Why is a DOM element null?
本文介绍了为什么 DOM 元素为空?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有这个简单的 HTML 文件:
I have this simple HTML file:
<!DOCTYPE html>
<html>
<head>
<script src='test.js'></script>
</head>
<body>
<p>I am a paragraph tag</p>
<h1 >I am an h1 tag</h1>
<div id="id"> I am a div tag</div>
</body>
还有这个简单的脚本(test.js):
And this simple script (test.js):
y=document.getElementById("id");
y.style.color="green";
到底为什么y"为空?我得到的错误是
Why on earth is "y" null? The error I'm getting is
TypeError: y is null
我确定这是我遗漏的简单语法,但我终生无法弄清楚!帮助!
I'm sure this is a simple syntax thing that I'm missing, but I can't for the life of me figure it out! Help!
发布脚本:html文件和test.js文件在同一个文件夹中.
Post Script: Both the html file and the test.js file are in the same folder.
推荐答案
当所有元素都被创建时,你必须把脚本放在文档的末尾:
you have to place the script at the end of the document when all the elements are created:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<p>I am a paragraph tag</p>
<h1 >I am an h1 tag</h1>
<div id="id"> I am a div tag</div>
</body>
<script src='test.js'></script>
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