How do Turn on Auto play in the bxSlider. (MVC ASP.NET)

I've setup a bx slider, in a partial view, and it work, except it will not auto play the slide.

This is my code:

<script>
    $(document).ready(function () {
        $('#slider').bxSlider();
        $('.bx-wrapper').width('70%');

        auto: true
    });

</script>

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