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This article mainly shows you the "sample Analysis of JavaScript basic Grammar rules", which is easy to understand and clear. I hope it can help you solve your doubts. Let me lead you to study and learn the article "sample Analysis of JavaScript basic Grammar rules".

Grammar rule 1: execute from top to bottom

The JavaScript program executes line by line in the order it is arranged in the HTML document. If the code (such as functions, global variables, etc.) needs to be used in the entire HTML file, it is best to put the code in the HTML file

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