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Javascript loading and execution-Performance Improvement

Source: Internet
Author: User
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Javascript performance issues in browsers may be the most important availability issue; Javascript obstructive browsers use a single process to handle UI processes and Js execution; whether embedded or external links, download and execute it immediately because it may modify the page Javascript obstruction
The performance of Javascript in browsers may be the most important availability issue.
Javascript's obstructive browser uses a single process to process the UI process and Js execution
Whether embedded or external, download and execute it immediately because it may modify the page

Concept of page Lifecycle
The waterfall graph shows the download time and executing time.
Adding a script and link body to the head does not output anything before loading, so a blank page is displayed.

The Code is as follows:


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