我正在嘗試通過首先創(chuàng)建對(duì)象來使數(shù)據(jù)更易于管理，從而將“新發(fā)貨”數(shù)組與當(dāng)前庫(kù)存數(shù)組合并。因此，任何相同的物品都會(huì)添加到庫(kù)存中的任何現(xiàn)有物品中。.sort 運(yùn)行，但 flat 似乎不執(zhí)行任何操作。我懷疑存在某種與我如何制作數(shù)組和弄亂索引有關(guān)的問題？function updateInventory(arr1, arr2) {    let invObj = {}    let updateObj = {}    let result = []    arr1.forEach( x => invObj[x[1]] = x[0])    arr2.forEach( x => updateObj[x[1]] = x[0])    for(let key in updateObj) {        if (invObj[key]) {            invObj[key] += updateObj[key]        } else {            invObj[key] = updateObj[key]        }    }    result =  Object.keys(invObj).map(key=>[invObj[key],key])    .sort((a,b)=>{    // attempting to sort inventory alphabetically here as required by my course's test        return a[1] - b[1]    })    return result}var curInv = [    [21, "Bowling Ball"],    [2, "Dirty Sock"],    [1, "Hair Pin"],    [5, "Microphone"]];var newInv = [    [2, "Hair Pin"],    [3, "Half-Eaten Apple"],    [67, "Bowling Ball"],    [7, "Toothpaste"]];console.log(updateInventory(curInv, newInv));