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到底JS文件的引入放置在头部好还是尾部好？-小象慢跑的博客

 6 years ago
source link: http://blog.51cto.com/13591336/2073123
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统计工具说是将JS文件放置在body标签之后会提升加载速度。不过最终我们还是放置在了head标签里。这里就涉及到一个JS文件位置的选择。到底JS文件的引入放置在头部好还是尾部好？今天小编和大家探讨，JS文件到底该放置最好。　　具体将引入的JS放在哪里与代码执行的顺序有关。网页文件的读取是从上到下的，如果将JavaScript文件放置在head当中，会先加载JS文件，之后再继续执行，那么此时，如果J

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