这篇文章主要介绍了关于如何利用js fetch实现ping效果,有着一定的参考价值,现在分享给大家,有需要的朋友可以参考一下
实际业务终于到的,在部分环境中可能存在网络不稳定的因素,wms手持有时候联网了但实际访问不到网页,很是尴尬
网上找到的大多数方案是通过image去实现的,我也曾参照过,但似乎效果不好
于是利用fetch写了个
import React, { Component } from 'react' import { View,TextInput,ScrollView,Text } from 'react-native' import { List, Button,Flex } from 'antd-mobile' const Item = List.Item class PingTest extends Component { constructor(props) { super(props) // 初始状态 this.state = { ping:'', msglist:[], } this.cycle = null } pingCycle = () => { const { ping,msglist } = this.state const start = (new Date()).getTime() fetch(`http://${ping}`).then(() => { const delta = (new Date()).getTime() - start if (delta > 5000) { msglist.push({ status: 0, msg: `ping ${ping} 连接超时`, }) } else { msglist.push({ status: 1, msg: `ping ${ping} time=${delta} ms`, }) } this.setState({ msglist, }) }).catch((err) => { msglist.push({ status: 0, msg: `ping ${ping} 连接失败`, }) this.setState({ msglist, }) }) } handlePing = () => { this.cycle = setInterval(this.pingCycle,1000) } handleStopPing = () => { clearInterval(this.cycle) } render() { const {msglist} = this.state return ( <View style={{ height: '100%'}}> <List> <Item> <TextInput onChangeText={text => this.setState({ping: text})} /> </Item> <Item> <Flex> <Flex.Item flex={1}><Button type="primary" onClick={this.handlePing.bind(this)}>Ping</Button></Flex.Item> <Flex.Item flex={1}><Button onClick={this.handleStopPing.bind(this)}>停止</Button></Flex.Item> </Flex> </Item> </List> <ScrollView style={{ height: 200,backgroundColor:"#000"}}> {msglist.length ? msglist.map(e => <Flex> <Flex.Item> <Text style={{color: e.status === 1 ? '#87d068' : '#f50'}}>{e.msg}</Text> </Flex.Item> </Flex>):null} </ScrollView> </View> ) } } export default PingTest
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