uniapp 用 Server Sent Event(SSE)长请求

1.创建eventsource.js文件（eventsource.js的代码在最后面）
2.引入

import { EventSourcePolyfill } from "@/utils/eventsource.js";

3.调用

getPresentMsg(){

              let _this = this;
              let url = 'http://192.168.110.183:90'
              
              this.source = new EventSourcePolyfill(
                url + "/worship/memPresentRecord/presentMsg?type=0&memorialId="+this.memorial.id,
                {
                  headers: {
                    // Authorization: "Bearer " + getToken(),
                    "Content-Type": "text/event-stream;charset=UTF-8",
                    "Cache-Control": "no-cache",
                    Connection: "keep-alive",
                  },
                  //重连时间间隔，单位：毫秒，默认45000毫秒，这里设置为10分钟
                  heartbeatTimeout: 10 * 60 * 1000,
                }
              );
              this.source.onopen = () => {
                console.log(1, "NOTICE建立连接");
              };
              this.source.onmessage = (e) => {
                // _this.scrollMessage = e.data;
                let presentId =JSON.parse(  e.data).presentId
                if(  presentId){
                  let obj=jipinList.find(item=>{
                    return item.id ==presentId
                  })
                  _this.toSacrifice(obj)
                }
              };
              this.source.onerror = (e) => {
                if (e.readyState == EventSource.CLOSED) {
                  console.log(3, "NOTICE连接关闭");
                } else if (this.source.readyState == EventSource.CONNECTING) {
                  console.log(4, "NOTICE正在重连");
                  //重新设置header
                  // this.source.headers = {
                  //   Authorization: "Bearer " + getToken(),
                  // };
                } else {
                  console.log(5, e);
                }
              };
            },

eventsource.js的代码
/** @license

• eventsource.js
• Available under MIT License (MIT)
• https://github.com/Yaffle/EventSource/
  */

!function(e){"use strict";var r,H=e.setTimeout,N=e.clearTimeout,j=e.XMLHttpRequest,o=e.XDomainRequest,t=e.ActiveXObject,n=e.EventSource,i=e.document,w=e.Promise,d=e.fetch,a=e.Response,h=e.TextDecoder,s=e.TextEncoder,p=e.AbortController;function c(){this.bitsNeeded=0,this.codePoint=0}"undefined"==typeof window||void 0===i||"readyState"in i||null!=i.body||(i.readyState="loading",window.addEventListener("load",function(e){i.readyState="complete"},!1)),null==j&&null!=t&&(j=function(){return new t("Microsoft.XMLHTTP")}),null==Object.create&&(Object.create=function(e){function t(){}return t.prototype=e,new t}),Date.now||(Date.now=function(){return(new Date).getTime()}),null==p&&(r=d,d=function(e,t){var n=t.signal;return r(e,{headers:t.headers,credentials:t.credentials,cache:t.cache}).then(function(e){var t=e.body.getReader();return n._reader=t,n._aborted&&n._reader.cancel(),{status:e.status,statusText:e.statusText,headers:e.headers,body:{getReader:function(){return t}}}})},p=function(){this.signal={_reader:null,_aborted:!1},this.abort=function(){null!=this.signal._reader&&this.signal._reader.cancel(),this.signal._aborted=!0}}),c.prototype.decode=function(e){function t(e,t,n){if(1===n)return 128>>t<=e&&e<<t<=2047;if(2===n)return 2048>>t<=e&&e<<t<=55295||57344>>t<=e&&e<<t<=65535;if(3===n)return 65536>>t<=e&&e<<t<=1114111;throw new Error}function n(e,t){if(6===e)return 15<t>>6?3:31<t?2:1;if(12===e)return 15<t?3:2;if(18===e)return 3;throw new Error}for(var r="",o=this.bitsNeeded,i=this.codePoint,a=0;a<e.length;a+=1){var s=e[a];0!==o&&(s<128||191<s||!t(i<<6|63&s,o-6,n(o,i)))&&(o=0,i=65533,r+=String.fromCharCode(i)),0===o?(i=0<=s&&s<=127?(o=0,s):192<=s&&s<=223?(o=6,31&s):224<=s&&s<=239?(o=12,15&s):240<=s&&s<=247?(o=18,7&s):(o=0,65533),0===o||t(i,o,n(o,i))||(o=0,i=65533)):(o-=6,i=i<<6|63&s),0===o&&(i<=65535?r+=String.fromCharCode(i):r=(r+=String.fromCharCode(55296+(i-65535-1>>10)))+String.fromCharCode(56320+(i-65535-1&1023)))}return 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i&&(n=H(function(){l()},0))},I.prototype.abort=function(){this._abort(!1)},I.prototype.getResponseHeader=function(e){return this._contentType},I.prototype.setRequestHeader=function(e,t){var n=this._xhr;"setRequestHeader"in n&&n.setRequestHeader(e,t)},I.prototype.getAllResponseHeaders=function(){return null!=this._xhr.getAllResponseHeaders&&this._xhr.getAllResponseHeaders()||""},I.prototype.send=function(){var e;if("ontimeout"in j.prototype&&("sendAsBinary"in j.prototype||"mozAnon"in j.prototype)||null==i||null==i.readyState||"complete"===i.readyState){var t=this._xhr;"withCredentials"in t&&(t.withCredentials=this.withCredentials);try{t.send(void 0)}catch(e){throw e}}else(e=this)._sendTimeout=H(function(){e._sendTimeout=0,e.send()},4)},f.prototype.get=function(e){return this._map[l(e)]},null!=j&&null==j.HEADERS_RECEIVED&&(j.HEADERS_RECEIVED=2),P.prototype.open=function(o,i,t,n,e,r,a){o.open("GET",e);var s,c=0;for(s in o.onprogress=function(){var 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1. =& ↩
2. & ↩