为什么在创建对象数组时出现错误？

Question

我的目标是创建一个 JavaScript 对象数组，并希望 output 采用如下格式：

 journal = [ { events: ["work", "ice cream", "cauliflower", "lasagna", "touched tree", "brushed teeth" ], squirrel: false }, { events: ["weekend", "cycling", "break", "peanuts", "soda" ], squirrel: true } ];

目标是使用给定参数（事件和松鼠）从以下 function 构建

 let journal = []; function addEntry(events, squirrel) {........... ........... }

我写了下面的代码，output 给了我一个错误：“false 不是函数”。 如何修复该错误并获得预期的 output？ 谢谢

 let journal = []; function addEntry(events, squirrel) { journal.push( ({ events: ["work", "ice cream", "cauliflower", "lasagna", "touched tree", "brushed teeth"] }, false) ({ events: ["weekend", "cycling", "break", "peanuts", "soda"] }, true) ) } addEntry(console.log(journal));

Answer 1

当您使用push推送多个值时，您需要用,分隔它们。 这里你有这种格式的(obj,false)() ，因为逗号运算符返回最后一个操作数，所以你实际上最终做了false()

 let journal = []; function addEntry(events, squirrel) { journal.push( ({ events: ["work", "ice cream", "cauliflower", "lasagna", "touched tree", "brushed teeth"] }, false), ({ events: ["weekend", "cycling", "break", "peanuts", "soda"] }, true) ) } addEntry(journal); console.log(journal)

在这里，如果您打算只推送 object，则不需要包装() ，并且如果您在 object 中需要多个属性，则可以在 object 中添加多个属性，如下所示

 {
   key: value,
   key: value
 }

 let journal = []; function addEntry(events, squirrel) { journal.push({...events,squirrel}) } addEntry({ events: ["work", "ice cream", "cauliflower", "lasagna", "touched tree", "brushed teeth"]},true); addEntry({ events: ["weekend", "cycling", "break", "peanuts", "soda"]},false) console.log(journal)

Answer 2

您的语法不正确

1. 您将console.log方法的结果传递给addEntry方法，这是没有意义的

2. 您在 addEntry 方法中使用了() ({ events: [...] }, false) ，这是一个语法错误，您需要推送一个 object （由{}包装，如下所示： ({ events: [...], squirrel: false })

这是示例代码：

let journal = [];

function addEntry(events) {
  events.forEach(event => journal.push(event));
}

let events = [
    {
        events: ["work", "ice cream", "cauliflower",
          "lasagna", "touched tree", "brushed teeth"
        ],
        squirrel: false,
    },
    {
        events: ["weekend", "cycling", "break", "peanuts",
          "soda"
        ],
        squirrel: true
    }
]

addEntry(events);
console.log(journal);