我想避免并发,并且将操作限制为每秒1次。
这是因为onChange
事件还会触发1秒持续时间的幻灯片放映,并且触发两次会破坏UI。
我最初以4次去抖功能开始,但最终做到了:
import React from 'react';
import { css } from 'styled-components';
import PropTypes from 'prop-types';
import omit from 'lodash.omit';
import throttle from 'lodash.throttle';
import Img from '@bootstrap-styled/v4/lib/Img';
export default class ServicesAndSolutionImg extends React.PureComponent {
static propTypes = {
src: PropTypes.string.isRequired,
alt: PropTypes.string.isRequired,
onDigitalSolution: PropTypes.func.isRequired,
onServices: PropTypes.func.isRequired,
onHosting: PropTypes.func.isRequired,
onAddons: PropTypes.func.isRequired,
};
state = {
throttleFn: null,
}
componentWillMount() {
this.setState({
throttleFn: (e) => throttle(this.props[e.target.value], 1000, { leading: false, trailing: true })(),
});
}
render() {
const { src, alt } = omit(this.props, [
'onDigitalSolution',
'onServices',
'onHosting',
'onAddons',
]);
return (
<div css={css`position: relative`}>
<Img fluid src={src} alt={alt} className="w-100 pt-3 pl-5 pr-5" />
<div css={css`
position: absolute;
top: 0;
right: 0;
left: 0;
right: 0;
width: 100%;
height: 100%;
`}>
<div css={css`
position: relative;
width: inherit;
height: inherit;
button {
cursor: pointer;
position: absolute;
top: 23%;
height: 51%;
opacity: 0;
}
button:nth-child(1) {
left: 15%;
width: 16%;
}
button:nth-child(2) {
left: 32%;
width: 16%;
}
button:nth-child(3) {
left: 48%;
width: 16%;
}
button:nth-child(4) {
left: 65%;
width: 16%;
}
`}>
<button onClick={this.state.throttleFn} value="onDigitalSolution" />
<button onClick={this.state.throttleFn} value="onServices" />
<button onClick={this.state.throttleFn} value="onHosting" />
<button onClick={this.state.throttleFn} value="onAddons" />
</div>
</div>
</div>
);
}
}
没有延迟,每秒1次点击,没有并发
1秒延迟,最多4个并发操作。
有人知道为什么失败吗?预先感谢,
答案 0 :(得分:1)
Throttle是一个接受函数并返回受限制函数的函数。受限制的函数仅在 x 毫秒的窗口中调用一次原始函数。
多次调用节流阀,返回多个您要调用的节流函数,并且每个函数都是时间窗口中唯一的调用。
要解决此问题,请将回调函数上调用节流的结果分配给组件上的属性,然后在注册click事件时调用该函数。
export default class ServicesAndSolutionImg extends React.PureComponent {
static propTypes = {
src: PropTypes.string.isRequired,
alt: PropTypes.string.isRequired,
onDigitalSolution: PropTypes.func.isRequired,
onServices: PropTypes.func.isRequired,
onHosting: PropTypes.func.isRequired,
onAddons: PropTypes.func.isRequired,
};
// create the throttled function
throttleFn = throttle((e) => this.props[e.target.value], 1000, { leading: false, trailing: true })
render() {
// no need to omit anything - you know what you want
const { src, alt } = this.props;
return (
<div css={css`position: relative`}>
<Img fluid src={src} alt={alt} className="w-100 pt-3 pl-5 pr-5" />
<div css={css`
position: absolute;
top: 0;
right: 0;
left: 0;
right: 0;
width: 100%;
height: 100%;
`}>
<div css={css`
position: relative;
width: inherit;
height: inherit;
button {
cursor: pointer;
position: absolute;
top: 23%;
height: 51%;
opacity: 0;
}
button:nth-child(1) {
left: 15%;
width: 16%;
}
button:nth-child(2) {
left: 32%;
width: 16%;
}
button:nth-child(3) {
left: 48%;
width: 16%;
}
button:nth-child(4) {
left: 65%;
width: 16%;
}
`}>
<button onClick={this.throttleFn} value="onDigitalSolution" />
<button onClick={this.throttleFn} value="onServices" />
<button onClick={this.throttleFn} value="onHosting" />
<button onClick={this.throttleFn} value="onAddons" />
</div>
</div>
</div>
);
}
}