With a lot of help from Jongware, here's a little script to change the view zoom level for an AI document window.
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var ZF = prompt ("Enter the zoom factor you wish to use, 1.00 = 100%", 1.00, "Zoom to New Level");
if ( app.documents.length > 0 ) {
app.documents[0].views[0].zoom = ZF;
}
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