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我在React項目中映射了一些數組,並且返回了li-tag子元素,當然React期望每個動態子元素都有一個唯一的密鑰。但是,我不認爲我有任何獨特的關鍵......至少,我不知道。通過我的數據和代碼(從https://tmi.twitch.tv/group/user/instak/chatters獲取),有沒有我可以通過的任何密鑰?爲動態孩子添加一個獨特的鑰匙,而沒有任何獨特的鑰匙
import React, {Component} from 'react';
export default class Overview extends Component{
constructor(props, context){
super(props, context);
this.state = {
chatters: {
moderators: [],
staff: [],
admins: [],
global_mods: [],
viewers: []
}
};
}
componentWillMount() {
fetch('/api/overview') // fetch from Express.js server
.then(response => response.json())
.then(result => this.setState({
chatters: result.chatters
}));
}
render(){
let {chatters} = this.state;
return (
<div>
<h2>Chatters</h2>
<div>
<h3>Moderators</h3>
<ul>
{chatters.moderators.map(chatter => {
return <li key={chatter.key}>{chatter}</li>;
})}
</ul>
</div>
<div>
<h3>Staff</h3>
<ul>
{chatters.staff.map(chatter => {
return <li key={chatter.key}>{chatter}</li>;
})}
</ul>
</div>
<div>
<h3>Admins</h3>
<ul>
{chatters.admins.map(chatter => {
return <li key={chatter.key}>{chatter}</li>;
})}
</ul>
</div>
<div>
<h3>Global Mods</h3>
<ul>
{chatters.global_mods.map(chatter => {
return <li key={chatter.key}>{chatter}</li>;
})}
</ul>
</div>
<div>
<h3>Plebs</h3>
<ul>
{chatters.viewers.map(chatter => {
return <li key={chatter.key}>{chatter}</li>;
})}
</ul>
</div>
</div>
);
}
}
哇......我有這個眼光在我的它始終是數字數組計數的頭腦......你是對的,每一個名字就足以作爲一個獨特的密鑰... 感謝您指出了這一點! – Kevin