使用节气门时遇到问题。使用下面的代码,油门可以正常工作。但是,当我取消注释setPosition([e.clientX, e.clientY])
时出了点问题。节流阀已损坏,position
立即更新,而无需等待1秒。
import React, { useState } from 'react'
import { throttle } from 'lodash'
export default () => {
const [position, setPosition] = useState([0, 0])
const [x, y] = position
const handleMouseMoveThrottle = throttle(e => {
console.log(e.clientX, e.clientY)
// setPosition([e.clientX, e.clientY])
}, 1000)
const handleMouseMove = e => {
e.persist()
handleMouseMoveThrottle(e)
}
return (
<div
style={{ width: 300, height: 300, border: 'solid 1px black' }}
onMouseMove={handleMouseMove}
>
<div>
Position: {x}, {y}
</div>
</div>
)
}
有解决方案吗?
答案 0 :(得分:1)
lodash throttle
的默认行为是立即在设置的时间结束时运行(如果该事件在该时间被多次调用)。为了获得所需的行为,您需要将选项传递给油门调用。
const handleMouseMoveThrottle = throttle(e => {
console.log(e.clientX, e.clientY)
// setPosition([e.clientX, e.clientY])
}, 1000, { leading: false }); // this says, do not run the function immediately
默认情况下,leading
设置为true
,另一个选项trailing
也设置为true
。
看看这个:
https://lodash.com/docs/4.17.11#throttle
这:
https://github.com/lodash/lodash/blob/master/throttle.js#L52
了解更多信息