자바스크립트 유효성 검사 - 중복 체크

function overlapCheck(){
    var result = true;
    
    var arr = [];

    $(".trList td :text").each(function(i) {

        arr[i] = $(this).val();

    });

    for(i = 0; i < arr.length-1; i++){

        for(j = i; j < arr.length-1; j++){

            if(!arr[i]) return;

            if(arr[i] == arr[j+1]){

                $(".trList td :text").eq(j+1).focus();

                result = false;

                return false;

            }

        }

    }

    return result;
}