Add eval support for script tags

[amadeus]

This commit adds support for eval-ing script.text. This is a
requirement for Phaser when using their script preloading functionality.

Phaser loads scripts through XMLHttpRequest, then sets the responseText
to the script.text attribute.

More information can be seen here:

https://github.com/photonstorm/phaser/blob/47123c192df7f3a78ac25110a9a72b72f61417c2/src/loader/Loader.js#L2750-L2761

[phoboslab]

Do we need to support script.innerHTML as well? Or do browsers only eval the .text property and ignore innerHTML?

[amadeus]

@phoboslab I can't say for sure. I did .text because that's what Phaser did.

The more I think about it, .text would be the proper one - since you would want to be interpreting escaped html entities properly.

[amadeus]

The only real question I have though - should we put that eval in a setTimeout at 0? Would need to do some browser testing to see if reading that script happens async after it gets appended in a browser or immediately. Also it would help of there's a JS error in that file, to not interrupt the JS context.

[amadeus]

Annnnd, it looks like it's interpreted immediately. So the code I have submitted is good. Demo here:

https://jsfiddle.net/Lsga8otx/