題目

Compare two arrays and return a new array with any items only found in one of the two given arrays, but not both. In other words, return the symmetric difference of the two arrays.
Remember to use Read-Search-Ask if you get stuck. Try to pair program. Write your own code.

Here are some helpful links:
Comparison Operators

Array.prototype.slice()

Array.prototype.filter()

Array.prototype.indexOf()

Array.prototype.concat()

given code

function diffArray(arr1, arr2) {
  var newArr = [];
  // Same, same; but different.
  return newArr;
}
diffArray([1, 2, 3, 5], [1, 2, 3, 4, 5]);

• 遍歷arr1
• 在遍歷arr1的時(shí)候遍歷arr2。比較兩個(gè)元素是否全等。如果全等，那么兩個(gè)元素的下標(biāo)都加一，如果不等，則把