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Defer test_javascript tips for javascript delayed loading-js tutorial

Source: Internet
Author: User
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Occasionally, I found a tag defer for delayed loading in js and wondered why such a useful thing was not popular. I picked it up today and used it. I found it only in ie7, you can run the 360 and Security Tool on the browser to find out why you don't need it. Occasionally, you may find a tag called defer for delayed loading in js, and you may wonder why such a useful thing is not popular.
Tested several browsers. It can be used in ie7, 360, and security explorer. This is why defer is not selected.

The Code is as follows:






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