javascript - 如何将对象添加到数组中javascript

Question

我正在尝试使用 addExpense 方法将对象添加到费用数组中。

const account = {
    expenses: [],
    addExpense: function(description, amount){
        let addObject = {
            description : amount
        }
        this.expenses.push(addObject)
    }
}

account.addExpense('Shopping', 50)
console.log(account.expenses)

我没有收到任何错误，但结果给了我一个使用参数名称而不是实际字符串值“Shopping”的对象。 amount 参数效果很好。

[{"description": 50}]

Answer 1

使用computed property names - 括号中的表达式，其计算结果为键名称(在本例中为 description 值):

let addObject = {
    [description] : amount
}

演示:

const account = {
    expenses: [],
    addExpense: function(description, amount){
        let addObject = {
            [description] : amount
        }
        this.expenses.push(addObject)
    }
}

account.addExpense('Shopping', 50)
console.log(account.expenses)