How to find keywords through JavaScript and locate the scroll bar according to the location of the found keywords? I'm developing a rich text program. Now I don't know how to display the found keywords in the middle of the screen

 function SearchWord(data) {

        let index_all = Indexof_All(data, "a");
        console.log(index_all);

    }



    function Indexof_All(str, v) {

        let index = str.indexOf(v);

        let num = 0;
        let index_arr = [];
        index_arr.push(index);

        while (index !== -1) {
            num++;
            index = str.indexOf(v, index + 1);
            if (index != -1) {
                index_arr.push(index);
            }
        }

        return index_arr;

    }

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