我将数据从孩子 1 发送到父母，然后发送到孩子 2。现在我需要发送三件事；日、月和年的值。只获取一个值就可以了，但是当我尝试获取所有三个值时，我得到了一个 TypeError 。
家长：
import Results from "./Results";
import TopForm from "./TopForm";
import { useState } from "react";
function Hero() {
const [dayValue, setDayValue] = useState("--");
const [monthValue, setMonthValue] = useState("--");
const [yearValue, setYearValue] = useState("--");
return (
<div className="font-poppins bg-light-grey p-2 h-screen w-screen">
{/* Main Container */}
<div className="container bg-white mt-16 max-w-[95%] md:max-w-2xl mx-auto p-10 rounded-xl rounded-br-3xl">
<TopForm
// This does not work, Uncaught TypeError: callback is not a function
// callback={[setDayValue, setMonthValue, setYearValue]}
// This does work but only gets the dayValue
callback={setDayValue}
/>
<Results
dayValue={dayValue}
monthValue={monthValue}
yearValue={yearValue}
/>
</div>
</div>
);
}
export default Hero;
Child 1（TopForm获取数据）
import { useState } from "react";
function TopForm({ callback }) {
const [error, setError] = useState(false);
const [dayText, setDayText] = useState("");
const [monthText, setMonthText] = useState("");
const [yearText, setYearText] = useState("");
const handleSubmit = (event) => {
event.preventDefault();
setDayText("");
setMonthText("");
setYearText("");
};
return (
// Inputs Container
<form onSubmit={handleSubmit}>
{/* Upper Form */}
<div className="container flex justify-center gap-4 md:max-w-lg">
<div className="container w-1/3 flex flex-col">
<label
htmlFor="day"
className={`if ${error} ? "text-red-400 text-sm mb-1 uppercase tracking-wide" : "text-smokey-grey"`}
id="day-label"
>
Day
</label>
<input
type="number"
name="day"
id="day"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setDayText(event.target.value)}
value={dayText}
/>
<div
id="day-error"
className="hidden text-xs text-red-400 mt-2"
>
Must be a valid date
</div>
</div>
<div className="container w-1/3 flex flex-col">
<label
htmlFor="month"
id="month-label"
className="text-smokey-grey text-sm mb-1 uppercase tracking-wide"
>
Month
</label>
<input
type="number"
name="month"
id="month"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setMonthText(event.target.value)}
value={monthText}
/>
<div
id="month-error"
className="hidden text-xs text-red-400 mt-2"
>
Must be a valid date
</div>
</div>
<div className="container w-1/3 flex flex-col">
<label
htmlFor="year"
id="year-label"
className="text-smokey-grey text-sm mb-1 uppercase tracking-wide"
>
Year
</label>
<input
type="number"
name="year"
id="year"
required
className="border-solid border-2 border-light-grey rounded-md p-3 text-lg outline-none focus:border-purple"
onChange={(event) => setYearText(event.target.value)}
value={yearText}
/>
<div
id="year-error"
className="hidden text-xs text-red-400 mt-2"
>
Must be a valid date
</div>
</div>
</div>
{/* Line Arrow Container */}
<div className="container my-20 flex justify-center relative">
<hr className="border-light-grey w-full" />
<button
id="button"
className="absolute top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2 bg-purple w-16 h-16 rounded-full flex items-center justify-center hover:scale-125 transition-all"
type="submit"
onClick={() => callback(dayText, monthText, yearText)}
>
<img
src="/images/icon-arrow.svg"
alt="arrow"
className="w-6"
/>
</button>
</div>
</form>
);
}
export default TopForm;
Child 2（结果，显示从 TopForm 收集的数据）
function Results({ dayValue, monthValue, yearValue }) {
return (
// Results Container
<div id="results-container" className="container">
{/* Individual Container */}
<div className="container flex">
<span
id="results-year"
className="text-5xl italic font-bold text-purple mr-2"
>
{yearValue}
</span>
<p className="text-5xl italic font-bold mr-2">years</p>
</div>
<div className="container flex">
<span
id="results-month"
className="text-5xl italic font-bold text-purple mr-2"
>
{monthValue}
</span>
<p className="text-5xl italic font-bold mr-2">months</p>
</div>
<div className="container flex">
<span
id="results-day"
className="text-5xl italic font-bold text-purple mr-2"
>
{dayValue}
</span>
<p className="text-5xl italic font-bold mr-2">days</p>
</div>
</div>
);
}
export default Results;
callback我们可以通过跟踪您在以下位置使用该prop来查看问题的根源TopForm：传递
callback为callback={[setDayValue, setMonthValue, setYearValue]}意味着这callback是一个数组，因此您尝试将数组作为函数调用，这是不正确的。相反，您可以单独调用数组的内部函数，如下所示：
或者您可以创建一个回调函数，
Hero接受三个参数并调用状态函数本身：Or you could pass the functions as separate props: