JSLint "document.write can be a form of eval" - How is this so?

I've come across this message in JSLint...

document.write can be a form of eval.

and was wondering exactly how so?

The JSLint instructions page states:

The eval function...provide access to the JavaScript compiler. This is sometimes neces开发者_如何学编程sary, but in most cases it indicates the presence of extremely bad coding....

So, how does document.write "provide access to the JavaScript compiler" then?

Thanks

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What does your browser do with this?

document.write('<script type="text/javascript">window.alert("evaled " + (1 + 2))</script>');