how the linkedin js is a valid javascript

问题

LinkedIn Javascript integration is done with:

<script src="http://platform.linkedin.com/in.js" type="text/javascript">
   api_key: 9XXXXXXX
   authorize: true
</script>

What I do not understand, how this is a valid javascript? How come the api_key is not quoted.

回答1:

The body of a script tag with a src is never executed. However, the loaded script can access its contents like the contents of any other element. So it's a nice place to store metadata related to the script that was loaded.

Actually, it was a nice place for it before data- attributes got introduced. Using them would be more appropriate, but the linkedin api is probably older than data- attributes or they simply wanted to keep it simple.

A possible way to access the tag is putting the following code in the .js file:

var scripts = document.getElementsByTagName('script');
var thisScriptTag = scripts[scripts.length - 1];

^Source

You can then use the textContent or innerText property to access whatever is in the tag.

来源：https://stackoverflow.com/questions/11336743/how-the-linkedin-js-is-a-valid-javascript