This is could be done by many and many ways, Will give you some ideas on how that could be done:
lets start with the js data:
1- you could use the wordpress function wp_localize_script this function adds a global variable in your footer or your header and then in your js file you could use this variable.search for it and you will see many tutorials.
2- you can save your js data using normal html attributes for example in your wp dashboard you have a custom option to change slider time i will call this option my_slider_time and of course you have a custom html div for your slider in that div add html5 attribute in this way <div class="slider-holder" data-slider-time="<? echo my_slider_time ?>">
now in your js file get this attribute by using the jquery function data example: $( "div.slider-holder" ).data( "slider-time" )