如何计算不同数组之间的所有组合？

Question

比方说，我有这样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样的结果

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

只需遍历其中的一个，输出每个数组的索引。你需要使用这种循环的内部循环，使用不同的指标为每个循环：

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); 
 
    } 
 
    } 
 
}

您可以通过简单地乘以三个阵列的.length一起获得总，总赋值给一个变量，并输出该变量：

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);

为了得到随机输出，你可以用结合Math.floor()与数组索引Math.random()如下：

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.");

希望这有助于！ :)

Answer 2

只是计算？这很容易。

乘以它们。 5*3*4=60变体。

如果你需要将所有的变体文字：

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>'); 
 
     } 
 
     } 
 
    }