如何计算不同数组之间的所有组合？

Question

假设我有以下3个数组：

 Shirts [White, Navy, Light Blue, Gray],
 Pants [Black, Navy, Gray],
 Ties [Houndstooth, Polka Dot, Herringbone, Solid]

我应该怎么做才能得到这个结果

 White Shirt with Black Pants and a Houndstooth Tie,
 White Shirt with Black Pants and a Polka Dot Tie,
 White Shirt with Black Pants and a Herringbone Tie,
 White Shirt with Black Pants and a Solid Tie,

 White Shirt with Navy Pants and a Houndstooth Tie,
 White Shirt with Navy Pants and a Polka Dot Tie,
 White Shirt with Navy Pants and a Herringbone Tie,
 White Shirt with Navy Pants and a Solid Tie,

 And so on,
 And so on...

Answer 1

只是为了计算？ 这很容易。

乘以它们。 5*3*4=60变体。

如果您需要所有变体作为文本：

 var shirts = ['White', 'Navy', 'Light Blue', 'Gray']; var pants = ['Black', 'Navy', 'Grey']; var ties = ['Houndstooth', 'Polka Dot', 'Herringbone', 'Solid']; for(var s in shirts) { for(var p in pants) { for(var t in ties) { document.write(shirts[s] + ' Shirt with ' + pants[p] + ' Pants and a ' + ties[t] + ' Tie<br>'); } } } 

Answer 2

只需循环其中之一，为每个数组输出索引。 为此，您需要在循环内部使用循环，每个循环使用不同的索引：

 var shirts = ["White", "Navy", "Light Blue", "Gray"]; var pants = ["Black", "Navy", "Gray"]; var ties = ["Houndstooth", "Polka Dot", "Herringbone", "Solid"]; for (var i = 0; i < shirts.length; i++) { var start = shirts[i] + " shirt with "; for (var j = 0; j < pants.length; j++) { var middle = pants[j] + " pants and a "; for (var k= 0; k < ties.length; k++) { var end = ties[k] + " tie.<br />"; document.write(start + middle + end); } } } 

您可以通过简单地将三个数组的.length乘在一起，将总数分配给一个变量，然后输出该变量来获得总数：

 var shirts = ["White", "Navy", "Light Blue", "Gray"]; var pants = ["Black", "Navy", "Gray"]; var ties = ["Houndstooth", "Polka Dot", "Herringbone", "Solid"]; var total_combinations = shirts.length * pants.length * ties.length; document.write("Total number of combinations: " + total_combinations); 

要获得随机输出，可以对数组索引使用Math.floor()和Math.random() ，如下所示：

 var shirts = ["White", "Navy", "Light Blue", "Gray"]; var pants = ["Black", "Navy", "Gray"]; var ties = ["Houndstooth", "Polka Dot", "Herringbone", "Solid"]; var random_shirt = shirts[Math.floor(Math.random()*shirts.length)]; var random_pants = pants[Math.floor(Math.random()*pants.length)]; var random_tie = ties[Math.floor(Math.random()*ties.length)]; document.write(random_shirt + " shirt with " + random_pants + " pants and a " + random_tie + " tie."); 

希望这可以帮助！ :)