问题:

I've built some widget for websites which is asynchronously loaded after the page is loaded:

<html>
    <head>...</head>
    <body>
        <div>...</div>

        <script type="text/javascript">
            (function(){
                var ns = document.createElement("script");
                ns.type = "text/javascript"; 
                ns.async = true;
                ns.src = "http://mydomain.com/myjavascript.js";
                var s = document.getElementsByTagName("script")[0];
                s.parentNode.insertBefore(ns, s);
            })();
        </script>
    </body>
</html>

Is there anyway to notify Google's crawler to index the page only after the page is fully loaded (after the async JavaScript modified the HTML)?

回答1:

No. You have to set up static mirror pages for asynchronous content. See here: http://code.google.com/web/ajaxcrawling/docs/getting-started.html

回答2:

Things have evolved since then:

Google crawls and indexes all content that was injected by javascript.

Google even shows results in the SERP that are based on asynchronously injected content.

Google can handle content from httpRequest().

(...)

Dynamically updated meta elements get crawled and indexed, too.

Source: http://www.centrical.com/test/google-json-ld-and-javascript-crawling-and-indexing-test.html