NodeJS计算数组中有多少个对象？ [英] NodeJS Count how many objects in array?

问题描述

我如何计算数组中有多少个对象？

How would I count how many objects there are inside an array?

数组看起来像：

[ {id: 1}, {id: 2}, ...]

我假设我可以使用count（）如果它是PHP，但是NodeJS / Javascript怎么样？

I assume I could use count() if it was PHP, but what about NodeJS/Javascript?

编辑：

if (offer.items_to_receive.length > 0) { 
    console.log("items: " + offer.items_to_receive.length);
    for(var i = 0; i < offer.items_to_receive.length; i++) {
        usersInRound.push(offer.steamid_other);
    }
}

logData('Accepted trade offer from ' + offer.steamid_other + '. (tradeofferid: ' + offer.tradeofferid + ')\nWorth ' + offer.items_to_receive.length + ' tickets. ');

为什么它可以读取值X票，而不是其他部分？

How come it can read the "worth X tickets", but not the other part?

推荐答案

使用 .length

var data = [{
    id: 1
}, {
    id: 2
}];

console.log(data.length);

更新，在您的编辑中我看到

Update, in your edit I see that

offer.items_to_receive 是 undefined ，确保对象 offer 具有属性 items_to_receive （应为数组）;

offer.items_to_receive is undefined, ensure that object offer has property items_to_receive (should be array);

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