给定一个数组，返回除了最大最小值之外数字的和

function sumArray(array) {
    if (!array) {
        return 0;
    }
    var len = array.length;
    if (len < 2 ) {
        return 0;
    }var small = array[0];
    var big = array[0];
    for (var i = 0; i < len; i++) {
        array[i] > big ? big = array[i] : big;
        array[i] < small ? small = array[i] :small;
    }
    var total = 0;

    for (var z = 0; z < len; z++) {
        total += array[z];
    }
    return total - big - small;
}

// 简洁写法
function sumArray(array) {
  if (array == null) {
    return 0;
  } else if (array.length < 2) {
    return 0;
  } else {
    array = array.sort(function(a,b) {return a - b;});
    var total = 0;
    for (var i = 1; i < array.length - 1; i++) {
      total += array[i];
    }
    return total;
  }
}

function sumArray(array) {

  if (array == null || array.length <= 2) {
    return 0
  }

  var max = Math.max.apply(Math, array);
  var min = Math.min.apply(Math, array);
  var sum = 0

  for (i = 0; i < array.length; i++) {
    sum += array[i];
   }

  return sum - max - min
}