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with JS, JS can bring dazzling visual effects to stand out. Especially the website, especially love generation for navigation js. But the search engine is very hate, the spider can’t identify JD internal links. Do the navigation, try to let the search engines crawl simple work, in order to get the favour of spiders.
if your site links too much, and no 404 pages, you will find that the website do diagnostic analysis, there will be a lot of page error. On the other hand, the search engine is not friendly to the website, will be rejected. So, to do a 404 page.