我想从提取中获取数据并以数组形式返回,但我不知道为什么数组为空。 如果console.log这个函数,它的写数组不为空,但是当我尝试将其呈现为select选项时,它为空
import React, { Component } from 'react'
export default class NameOfValuta extends Component {
constructor(props) {
super(props);
this.state = {
name: "",
nominal: ""
}
this.getData = this.getData.bind(this);
}
componentDidMount() {
const valuteNames = this.getData();
console.log(valuteNames);
}
getData() {
const valuteNames = [];
const api = "https://www.cbr-xml-daily.ru/daily_json.js";
fetch(api)
.then(res => res.json())
.then((data) => {
for (let item in data.Valute) {
valuteNames.push(data.Valute[item].CharCode)
}
})
return (valuteNames);
}
render() {
const valuteNames = this.getData();
return (
<div>
<OptionList items={valuteNames} />
</div>
)
}
}
function OptionList(props) {
const items = props.items;
const optionItems = items.map((item, index) => {
return <option key={index}>{item}</option>
})
return <select>{optionItems}</select>
}