indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
searchElement − Element to locate in the array.
fromIndex −The index at which to begin the search. Defaults to 0, i.e. the whole array will be searched. If the index is greater than or equal to the length of the array, -1 is returned.
Returns the index of the found element.
var index = [12, 5, 8, 130, 44].indexOf(8); console.log("index is : " + index )
index is : 2