Jquery，查找包含一个值的子数组

Question

我想将一个变量“推入”一个包含值的子数组。这是为了整合成一个“for循环”。但它不起作用..:-(我的错误在哪里？谢谢。

var add = "purple";
var val = "white";

arr = [
    ["blue","green","brown"],
    ["white","gray","black"],
    ["yellow","pink","red"]
];

subarr = [].indexOf(val) > -1;
arr[subarr].push(add);

/*
expected output :
arr = [
    ["blue","green","brown"],
    ["white","gray","black","purple"],
    ["yellow","pink","red"]
]
*/

Answer 1

您正在寻找

subarr = [].indexOf(val) > -1;

进入一个空数组。

相反，您可以找到子数组，如果存在则将值推送给它。

const
    add = "purple";
    val = "white",
    arr = [["blue", "green", "brown"], ["white", "gray", "black"], ["yellow", "pink", "red"]],
    sub = arr.find(a => a.includes(val));

if (sub) sub.push(add);

console.log(arr);

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