Question

我正在尝试迭代/映射对象数组并使用嵌套值，但我似乎无法让它工作。如果我传入一个简单的数组

const people = [
 { name: "joe", id: "1" },
 { name: "mary", id: "2" }
];

到我的ShowList组件

const ShowList = (props) => {
 const {people} = props;
 return ( renderPeep(people))
};

const renderPeep = (people) => (
 <ul>
  {people.map((peep, index) => (
    <li key={index}>{peep}</li>
   ))}
</ul>
 )

我得到两个值的列表：

joe1
mary1

并且点符号和括号都不起作用（{peep.name}）只列出名称。是map函数导致我们丢失底层对象的密钥信息？我错过了什么？

Answer 1

将<li key={index}>{peep}</li>更改为<li key={index}>{peep.name}</li>。在array#map内您获得了一个对象，您可以使用点表示法或括号表示法访问name。

或者，您也可以使用解构：

const renderPeep = (people) => (
 <ul>
  {people.map(({name}, index) => (
    <li key={index}>{name}</li>
   ))}
</ul>
)

const people = [
 { name: "joe", id: "1" },
 { name: "mary", id: "2" }
];

const ShowList = (props) => {
 const {people} = props;
 return (renderPeep(people));
};

const renderPeep = (people) => (
 <ul>
  {people.map((peep, index) => (
    <li key={index}>{peep.name}</li>
   ))}
</ul>
)

ReactDOM.render(
  <ShowList people={people} />,
  document.getElementById('app')
);

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id='app'></div>

ReactJs在对象数组中呈现嵌套值

1 个答案: