var strs = ['АБВД','АБВ' , 'ВН' , 'ГД'];
for(i = 0; i < strs.length; i++)
    strs[i] = strs[i].toLowerCase();
for(i = 0; i < strs.length; i++){
    for(j = 0; j < strs.length-1; j++){
        if(comparison(strs[j] , strs[j+1])){
            var booble = strs[j];
            strs[j] = strs[j+1];
            strs[j+1] = booble;
        }
    }
}
console.log(strs);

function comparison(str1 , str2){
    var size;
    if(str1.length <= str2.length)
        size = str1.length;
    else
        size = str2.length;
    for(k = 0; k < size; k++){
        if(str1[k] != str2[k]){
            if(str1[k] > str2[k])
                return 1;
            else
                return 0;
        }
    }
    if(str1.length > str2.length)
        return 1;
    else
        return 0;
}