const type = [“男褲”, “女褲”]
const color = [“黑色”, “白色”]
const size = [“S”,“L”]
let arr = [type ,color,size ]

arr.reduce((a, b) => { return a.flatMap(x => b.map(y => [...x, y]))}, [[]] )

[
[“男褲”, “黑色”, “S”],
[“男褲”, “黑色”, “L”],
[“男褲”, “白色”, “S”],
[“男褲”, “白色”, “L”],
[“女褲”, “黑色”, “S”],
[“女褲”, “黑色”, “L”],
[“女褲”, “白色”, “S”],
[“女褲”, “白色”, “L”],
]

總結

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