# 记录一下 React input输入框不生效的问题

选一个能用就行
 
let input = document.getElementById(‘userName’)
let lastValue = input.value
input.value=‘123’
let event = new Event(‘input’, { bubbles: true })
let tracker = input.\_valueTracker
if(tracker) {
tracker.setValue(lastValue)
}
input.dispatchEvent(event)

let input = document.querySelector(’input‘);

 let lastValue = input.value;

 input.value = ’test‘;

 let event = new Event('input', { bubbles: true });

 event.simulated = true;

  et tracker = input.\_valueTracker;

 if (tracker) {

    tracker.setValue(lastValue);

 }

 input.dispatchEvent(event);

来源：[vue和react使用js模拟键盘输入\_js模拟键盘输入vue input-CSDN博客](https://blog.csdn.net/weixin_46774564/article/details/123254550)

[vue和react使用js模拟键盘输入\_js模拟键盘输入vue input-CSDN博客](https://blog.csdn.net/weixin_46774564/article/details/123254550)