标签:const pollingDataInterval 实现 轮询 props clearInterval TIME 前端
方法一:简单实现
componentDidMount() {
this.props.countFxMissionByStatus();
countSwiftMessage();
}
componentWillReceiveProps(nextProps) {
const {location} = nextProps;
// 判断页面然后在更新的周期中实现轮询
const isSwiftManage = location.pathname.indexOf('swiftManage') > 0;
if (isSwiftManage) {
if (this.pollingInterval) {
window.clearInterval(this.pollingInterval);
}
this.pollingInterval = setInterval(() => {
this.props.countSwiftMessage();
}, POLLING_TIME);
} else {
window.clearInterval(this.pollingInterval);
}
}
方法二:完善的方式
const POLLING_TIME = 1000 * 30; // 轮询时间,每30秒轮询一次
const INVALID_TIME = 1000 * 60 * 30; // 轮询失效时间,用户不活跃则取消轮询
const UPDATE_LAST_ACTIVE_TIME = 1000 * 60; // 更新用户最新活动时间,每1分钟更新一次
componentDidMount() {
this.props.countTotal();
this.setLastActiveTimeFunc = _.throttle(this.setLastActiveTime, UPDATE_LAST_ACTIVE_TIME);
}
componentWillReceiveProps(nextProps) {
const { location: { key } }=nextProps;
if( key !== this.props.location.key){
this.props.countTotal();
this.lastActiveTime = new Date();
this.setPollingTimer();
this.watchUserActive();
}
}
componentWillUnmount() {
this.clearPollingTimer();
this.clearEventHandler();
}
watchUserActive = () => {
helper.addHandler(document, 'mousedown', this.setLastActiveTimeFunc);
helper.addHandler(document, 'mousemove', this.setLastActiveTimeFunc);
};
setLastActiveTime = () => {
this.lastActiveTime = new Date();
if (!this.pollingDataInterval) {
this.setPollingTimer();
}
};
setPollingTimer = () => {
const { clientKey } = this.state;
if (this.pollingDataInterval) {
clearInterval(this.pollingDataInterval);
}
this.pollingDataInterval = setInterval(() => {
const now = new Date();
const { countTotal} = this.props;
if (now - this.lastActiveTime < INVALID_TIME) {
countTotal({ clientKey });
} else {
clearInterval(this.pollingDataInterval);
this.pollingDataInterval = null;
}
}, POLLING_TIME);
};
clearEventHandler = () => {
helper.removeHandler(document, 'mousedown', this.setLastActiveTimeFunc);
helper.removeHandler(document, 'mousemove', this.setLastActiveTimeFunc);
};
clearPollingTimer = () => {
if (this.bookKeeperInterval) {
clearInterval(this.bookKeeperInterval);
}
if (this.pollingDataInterval) {
clearInterval(this.pollingDataInterval);
}
};
///helper.addHandler
addHandler(target, eventType, handler) {
let fn;
if (target.addEventListener) {
// 主流浏览器
target.addEventListener(eventType, handler, false);
} else {
// IE
target.attachEvent(`on${eventType}`, handler);
}
},
标签:const,pollingDataInterval,实现,轮询,props,clearInterval,TIME,前端 来源: https://blog.csdn.net/zjq_1234/article/details/120327035
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