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网页中的三种核心语言是什么？

HTML

PHP

JavaScript

CSS

请填写缺少的命令，将文件“code.js”添加到您的网页。

<script ="text/javascript" ="code.js"></ >

为什么要将Javascript代码放在关闭正文标签之前？

因为这是唯一可行的方法.

因为这样符合标准.

让浏览器窗口中的网页完全加载.

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