pagination 分页计算

pagination(200, 2);

function pagination(total, current) {
  var page = [];
  if (total < 9) {
    for (var i = 0; i < total; i++) page.push(i);
  } else if (total - current < 9) {
    for (var j = total - 9; j < total; j++) page.push(j);
  } else {
    var start = current - 4;
    var end = current + 5;
    while (start <= 0) end++, start++;
    // console.log(start, end);
    while (start < end) {
      page.push(start);
      start++;
    }
  }

  console.log(page);
}