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JavaScript fully parses javascript execution sequence in various browser web pages _ JavaScript skills

Source: Internet
Author: User
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Recently, I have passed some tests to comprehensively parse the JavaScript code execution sequence of web pages in various browsers and record them here. We know that javaScript is an interpreted language, and its execution is top-down, but the understanding of each browser is slightly different, the upstream and downstream of the code, that is, the Program Stream, is crucial to the correctness of the program. Therefore, I think it is necessary to thoroughly understand the execution sequence of multiple js blocks.
First, how many methods can be used to add javaScript to the page? The first two types are common. In fact, there are more.
1. Directly introduce external js files to the page:

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