Javascript React中的解构道具
我开始学习React js,并开始讨论解构道具的主题。通常,我们要做的是对道具进行解构,然后使用属性,就像下面组件中的代码一样Javascript React中的解构道具,javascript,reactjs,jsx,Javascript,Reactjs,Jsx,我开始学习React js,并开始讨论解构道具的主题。通常,我们要做的是对道具进行解构,然后使用属性,就像下面组件中的代码一样 import React from "react"; const Greet = props => { const { name, heroName } = props; //here I destructured it return ( <div> <h1> Hello {name} a.k.a
import React from "react";
const Greet = props => {
const { name, heroName } = props; //here I destructured it
return (
<div>
<h1>
Hello {name} a.k.a {heroName}
</h1>{" "}
// and then use simply name and heroName
</div>
);
};
export default Greet;
import React from "react";
import logo from "./logo.svg";
import "./App.css";
import Greet from "./components/Greet";
function App() {
return (
<div className="App">
<Greet name="kaptan" heroName=" ek" />
</div>
);
}
export default App;
import React from "react";
import Person from "./Person";
function NameList() {
const persons = [
{
id: 1,
name: "kaptan",
age: 30,
skill: "react"
},
{
id: 2,
name: "rinku",
age: 29,
skill: "java"
},
{
id: 3,
name: "ankit",
age: 39,
skill: "vue"
}
];
const personsList = persons.map(person => <Person person={person} />);
return <div>{personsList}</div>;
}
export default NameList;
import React from "react";
const Person = ({ person }) => {
// here i need to destructure person object
return (
<div>
<h2>
I am {person.name},My age is {person.age},I know {person.skill}
</h2>
</div>
);
};
export default Person;
从“React”导入React;
常量问候=道具=>{
const{name,heroName}=props;//这里我对它进行了解构
返回(
你好{name}a.k.a{heroName}
{" "}
//然后简单地使用name和heroName
);
};
导出默认值;
这是我的应用程序组件
import React from "react";
const Greet = props => {
const { name, heroName } = props; //here I destructured it
return (
<div>
<h1>
Hello {name} a.k.a {heroName}
</h1>{" "}
// and then use simply name and heroName
</div>
);
};
export default Greet;
import React from "react";
import logo from "./logo.svg";
import "./App.css";
import Greet from "./components/Greet";
function App() {
return (
<div className="App">
<Greet name="kaptan" heroName=" ek" />
</div>
);
}
export default App;
import React from "react";
import Person from "./Person";
function NameList() {
const persons = [
{
id: 1,
name: "kaptan",
age: 30,
skill: "react"
},
{
id: 2,
name: "rinku",
age: 29,
skill: "java"
},
{
id: 3,
name: "ankit",
age: 39,
skill: "vue"
}
];
const personsList = persons.map(person => <Person person={person} />);
return <div>{personsList}</div>;
}
export default NameList;
import React from "react";
const Person = ({ person }) => {
// here i need to destructure person object
return (
<div>
<h2>
I am {person.name},My age is {person.age},I know {person.skill}
</h2>
</div>
);
};
export default Person;
从“React”导入React;
从“/logo.svg”导入徽标;
导入“/App.css”;
从“/components/Greet”导入问候语;
函数App(){
返回(
);
}
导出默认应用程序;
上面的代码工作得很好,然后我进一步做了一个人,下面的名字列表组件就是我的名字列表组件
import React from "react";
const Greet = props => {
const { name, heroName } = props; //here I destructured it
return (
<div>
<h1>
Hello {name} a.k.a {heroName}
</h1>{" "}
// and then use simply name and heroName
</div>
);
};
export default Greet;
import React from "react";
import logo from "./logo.svg";
import "./App.css";
import Greet from "./components/Greet";
function App() {
return (
<div className="App">
<Greet name="kaptan" heroName=" ek" />
</div>
);
}
export default App;
import React from "react";
import Person from "./Person";
function NameList() {
const persons = [
{
id: 1,
name: "kaptan",
age: 30,
skill: "react"
},
{
id: 2,
name: "rinku",
age: 29,
skill: "java"
},
{
id: 3,
name: "ankit",
age: 39,
skill: "vue"
}
];
const personsList = persons.map(person => <Person person={person} />);
return <div>{personsList}</div>;
}
export default NameList;
import React from "react";
const Person = ({ person }) => {
// here i need to destructure person object
return (
<div>
<h2>
I am {person.name},My age is {person.age},I know {person.skill}
</h2>
</div>
);
};
export default Person;
从“React”导入React;
从“/”导入人员;
函数名称列表(){
警察人员=[
{
id:1,
姓名:“卡普坦”,
年龄:30,,
技能:“反应”
},
{
id:2,
姓名:“林库”,
年龄:29,,
技能:“java”
},
{
id:3,
名称:“ankit”,
年龄:39岁,
技能:“vue”
}
];
const personsList=persons.map(person=>);
返回{personsList};
}
导出默认名称列表;
这是我的个人部分
import React from "react";
const Greet = props => {
const { name, heroName } = props; //here I destructured it
return (
<div>
<h1>
Hello {name} a.k.a {heroName}
</h1>{" "}
// and then use simply name and heroName
</div>
);
};
export default Greet;
import React from "react";
import logo from "./logo.svg";
import "./App.css";
import Greet from "./components/Greet";
function App() {
return (
<div className="App">
<Greet name="kaptan" heroName=" ek" />
</div>
);
}
export default App;
import React from "react";
import Person from "./Person";
function NameList() {
const persons = [
{
id: 1,
name: "kaptan",
age: 30,
skill: "react"
},
{
id: 2,
name: "rinku",
age: 29,
skill: "java"
},
{
id: 3,
name: "ankit",
age: 39,
skill: "vue"
}
];
const personsList = persons.map(person => <Person person={person} />);
return <div>{personsList}</div>;
}
export default NameList;
import React from "react";
const Person = ({ person }) => {
// here i need to destructure person object
return (
<div>
<h2>
I am {person.name},My age is {person.age},I know {person.skill}
</h2>
</div>
);
};
export default Person;
从“React”导入React;
const Person=({Person})=>{
//这里我需要解构person对象
返回(
我是{person.name},我的年龄是{person.age},我认识{person.skill}
);
};
出口违约人;
所以我的问题是,为什么面对面组件我不能像在问候组件中那样进行解构
这样
import React from "react";
const Person = props => {
const { name, age, skill } = props;
return (
<div>
<h2>
I am {name},My age is {age},I know {skill}
</h2>
</div>
);
};
export default Person;
从“React”导入React;
const Person=props=>{
常量{姓名、年龄、技能}=道具;
返回(
我是{name},我的年龄是{age},我知道{skill}
);
};
出口违约人;
它没有给我正确的输出为什么?您可以使用它来获取人员
属性:
const { person: { name, age, skill } } = props;
此处使用嵌套的分解结构,因为props
具有以下结构:
{
person: {
name: ...,
age: ...,
skill: ...
}
}
或者,您可以从props
获取person
,然后使用其属性,类似于您最初编写的内容:
const { person } = props;
return (
<div>
<h2>I am {person.name},My age is {person.age},I know {person.skill} </h2>
</div>
);
const{person}=props;
返回(
我是{person.name},我的年龄是{person.age},我认识{person.skill}
);
Greet
组件从父组件接收name
,heroName
作为道具,因此您可以像以前一样对其进行分解
但是Person
组件将Person
作为道具接收,其中包含属性name
、age
、skill
等,因此不能直接对其进行分解。
你必须解构人物
道具
您可以对人员进行分解并获取其属性,也可以进行嵌套分解。嵌套的解构更容易,因为如果有更多的属性,则需要更多的代码行来获取每个属性。您不需要这样做。他所做的完全正确。只需从道具中解构人物,并使用点从对象中获取该属性。谢谢,但这样做的原因是什么destructuring@KaptanBhardwaj我编辑了我的答案,以便更好地解释为什么这里可以使用嵌套析构函数。是的,你可以直接这样做。@zixuan我的意思是OP在他的文章中使用的方式Greet
组件您得到的输出是什么,因为我看不出您的代码有任何错误。我用你的代码创建了一个codesandbox,它可以工作,所以我不知道问题出在哪里。