javascript - 如何使用 javascript 在数组中查找顺序更改的内容？

Question

    For Ex : original array : a =[1,2,3,4,g,5] 
    if the user wrongly entered the above array like this :   a = [2,1,3,4,g,5] 

如何使用 javascript 从原始数组列表中找到位置更改的元素？(即 [1,2] 已更改)。

Answer 1

// Try entering this at the prompt: [2, 1, 3, 4, 'g', 5]

var original = [1, 2, 3, 4, 'g', 5],
    input = eval(prompt('Enter an array please.'));

input.forEach(function (element, index) {
    var expected = original[index];
    if (element !== expected) {
        // They are different.
        // Logic to handle the difference goes here. Example:
        console.log('Elements were different; ' +
                    'expected `' + expected + '\', ' +
                    'got `' + element + '\'.');
    }
});