var pageType = <data:blog.pageType/> not possible?

<script>
    var pageType = <data:blog.pageType/>;
</script>

Get always a error:"Uncaught ReferenceError: item is not defined".

This is possible:

<b:if cond='data:blog.pageType != &quot;&quot;'>
    <script>
        console.log(&#39;<!--Index Page-->&#39;); 
    </script>
</b:if>

Why is "var pageType = <data:blog.pageType/>;" not possible, how could I do 
it otherwise?

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