Question

删除用于什么？我之前没有看过这样的语法，有人可以帮帮我吗？代码片段非常简单，它用于node.js，mongoose，mongodb

function _update(game, callback) {
    if (!game) {
        callback(new Error("Game must be provided."));
        return;
    }
    if (!game.gameId) {
        callback(new Error("Game id should be provided"));
        return;
    }

    var updates = (game instanceof Game) ? game.toObject() : game;
    delete updates._id;
    updates.modifiedDate = new Date();

    Game.findOneAndUpdate({"_id": game.id, "deleted" : {"$ne": true}}, updates, callback);
}

Answer 1

JavaScript removes the property from the object中的

delete。

var game = {
    id: 1
}

console.log(game);  // Object {id: 1}

delete game.id

console.log(game);  // undefined

Answer 2

用于从对象中删除属性。所以在这个例子中，它从更新中删除了_id属性

node.js“删除”的奇怪语法

2 个答案: