react中useRef的作用 import React,{useEffect, useState,useRef} from "react" /* 1.保存一个值,在整个生命周期中维持不变 2.重新赋值ref.current不会触发重新渲染 */ export default function U ...
package IO;
import java.io.*;
public class TextTa
{
public static void main(String[] args) {
try
{
OutputStreamWriter os = new OutputStreamWriter( new FileOutputStream("d:\\java\\IO\\IO.txt")
