一、分別安裝vue和node對應的socket.io
cnpm intsall socket.io -save
cnpm install vue-socket.io -save
二、前端socket配置
1、main.js引入socket,並連接3000端口
import vue_socket from 'vue-socket.io'
Vue.use(vue_socket, 'http://127.0.0.1:3000')
2、在組件中配置
<template>
<ul>
<li v-for="user in users">
{{user.name}}
</li>
</ul>
</template>
<script>
export default {
name: 'Test',
data () {
return {
users:[]
}
},
sockets:{//不能改
connect:function() {//與socket.io連接後回調
console.log('socket connected');
},
message:function(value) {
var json_value=JSON.parse(value);//將結果轉爲json格式
this.users=[];
var _this=this;
json_value.forEach(function(item,index){
_this.users.push({
'name':item.FIRST_
});
});
}
},
methods:{
initSocket(){ //初始化weosocket
this.$socket.emit("message", {}); //向服務端發送信息
},
},
created: function () {
this.initSocket();
},
//所有視圖都加載後,再調用圖表方法
mounted(){
this.$nextTick(function() {
var _this=this;
})
}
}
</script>
<style scoped>
</style>
三、後端socket配置:實時監控策略是定時查詢數據,發現數據有變化時,發送給前端
// node 後端服務器
const db=require('./db.js');
const mysql=require('mysql');
const express = require('express');
const app = express();
app.use(express.static('../dist'));
var server = require('http').createServer(app);
var io = require('socket.io')(server);
var conn=mysql.createConnection(db.mysql);
conn.connect();
io.on('connection', function(socket){
console.log('a user connected');
socket.on("disconnect", function() {
console.log("a user go out");
});
socket.on("message", function(obj) {
let sql="select FIRST_ from act_id_user";
let resultStr,resultjson;
conn.query(sql, function(err, result) {
if (err) {
console.log(err);
}
if (result) {
resultjson = JSON.stringify(result);
resultStr=resultjson;
io.emit("message", resultjson);
}
});
setInterval(function(){
conn.query(sql, function(err, result) {
if (err) {
console.log(err);
}
if (result) {
resultjson = JSON.stringify(result);
if(resultStr!=resultjson){
resultStr=resultjson;
io.emit("message", resultStr);
}
}
})
},3000);
});
});
// 監聽端口
server.listen(3000);
console.log('success listen at port:3000......');
四、瀏覽器打開 http://localhost:8080/#/test
修改數據庫數據: