javascript - Questions about this JS script -

i found js script on internet unsure on how adjust 1 index.php file.

so script has section holds default values. file .js file:

(function($) {     $.extend({          smoothscroll: function() {              // scroll variables (tweakable)             var defaultoptions = {                  // scrolling core                 framerate        : 150, // [hz]                 animationtime    : 700, // [px]                 stepsize         : 80, // [px]                  // pulse (less tweakable)                 // ratio of "tail" "acceleration"                 pulsealgorithm   : true,                 pulsescale       : 8,                 pulsenormalize   : 1,                  // acceleration                 accelerationdelta : 20,  // 20                 accelerationmax   : 1,   // 1                  // keyboard settings                 keyboardsupport   : true,  // option                 arrowscroll       : 50,     // [px]                  // other                 touchpadsupport   : true,                 fixedbackground   : true,                 excluded          : ""             };              // rest of script 

i want adjust these settings frontpage, the index.php, using javascript because have seen before, don't know how it.

so example:

index.php

<script>     smoothscroll {         framerate => 120         animationtime => 500         stepsize => 50     } </script> 

i hope can me out.

an object made this:

var obj = {     key: "value" // if value string     key1: 123    // if value number     // show 2 examples }; 

so, adapt situation, have pass object function, like

$.smoothscroll({     framerate: 120,     animationtime: 500,     stepsize: 50 });