如何比较两个数组的值，以及两者是否相等，返回diff。按钮就可以了。

function compareArrays(arr1, arr2) {
  if (arr1.length !== arr2.length) {
    return "Arrays are not equal in length";
  }

  var diff = [];
  for (var i = 0; i < arr1.length; i++) {
    if (arr1[i] !== arr2[i]) {
      diff.push(arr1[i]);
    }
  }

  if (diff.length === 0) {
    return "Arrays are equal";
  } else {
    return "Arrays are not equal. Difference: " + diff;
  }
}

var array1 = [1, 2, 3, 4, 5];
var array2 = [1, 2, 3, 4, 6];

console.log(compareArrays(array1, array2));