JS并不完全指代JavaScript，主要还是JS的调用、或iframe框架，直接在首页中使用JavaScript语句，还是很占网页体积的，而将代码写成JS的文件然后调用，可以达到内容动态修改的目的，而在SEO中最大的作用是可以有效降低网页体积，屏蔽广告、外部链接等内容，降低对页面实质内容的干扰，提高关键词密度，向搜索引擎展示页面内容的核心。
JS not entirely refer to JavaScript, mainly JS call, or iframe frame, directly in the page using JavaScript statements, or the volume is accounted for pages, but the code written in JS file and then call the content of the dynamic changes can be achieved purpose, the largest in the role of SEO can reduce the Wang Ye volume, no ads, external links Neirong, lower right substantive content of the page interference Tigao keyword density, search engines to display the page contents of He Xin.
1、屏蔽广告内容，这一点不需要多解释，譬如Google广告，百度广告等都是JS调用，而你网站上的其他广告代码也可以用JS调用，特别是包含较多外部链接的广告。
2、屏蔽外部链接，有些链接作弊者最低级的手段，就是在网站使用JS调用友情链接，这样便将链接展示在了网站首页上，但是这样的链接并不能传递权重，让搜索引擎读取到，如本博下面添加到书签的代码即为JS调用。
3、减少页面代码，减少网页体积，若有大段的代码且此内容并不很重要，就可以使用JS调用，而且可以让源码后面的内容相比直接引用代码先让搜索引擎看到。例如本博右边栏顶部的博客订阅链接即为JS调用。
综上所述，JS对SEO来说并不是一无是处，只要合理运用，JS同样会服务于SEO。而相同的功能也可使用iframe框架，只不过JS调用的方法更加简便。
1, shielding advertising content, it does not need to explain, such as Google ads, advertising, Baidu is JS call, while the other ads on your site can also use JS code calls, especially with the inclusion of external links to more ads.
2, shielding the external links, some links to the lowest level of the means of cheating, that is, the site links using JS call, This adds the link displayed on the website home page, but this does not pass the link weights, so that search engines read to such as the Bo following code shall be added to the bookmark called JS.
3, reducing the page code, reduce the page size, if a large section of the code and the content is not very important, you can use the JS call, and can be compared to the contents of the source behind the direct reference to the code to let search engines see. For example, Bo right-hand column of this blog subscription link at the top of the JS shall call.
In summary, JS on the SEO is not useless, as long as the rational use of, JS also would serve the SEO. The same functionality can also use the iframe frame, just call the method of JS easier.
