首先第一个函数的意思是，进入index页面后会先进入chat函数，获取URL中请求的参数num，渲染到index.html页面，然后index.html页面使用发起请求，发起请求后，ASGI服务器通过"": (.s)路由访问文件，文件指向了()类 。
第二个函数()类对请求进行了处理，接收的请求后获取组号即num的值，然后接收发送的信息后调用chat函数将收到的信息同等的发送回去，则是客户端断开请求后触发的函数 。
前端index.html的文件如下：
reset.min.css文件:
html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td,article,aside,canvas,details,embed,figure,figcaption,footer,header,hgroup,menu,nav,output,ruby,section,summary,time,mark,audio,video{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline}article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section{display:block}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:before,blockquote:after,q:before,q:after{content:'';content:none}table{border-collapse:collapse;border-spacing:0}
style.css文件:
*, *:before, *:after {box-sizing: border-box;}:root {--white: #fff;--black: #000;--bg: #f8f8f8;--grey: #999;--dark: #1a1a1a;--light: #e6e6e6;--wrapper: 1000px;--blue: #00b0ff;}body {background-color: var(--bg);-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale;text-rendering: optimizeLegibility;font-family: 'Source Sans Pro', sans-serif;font-weight: 400;background-image: url("../img/image.jpg");background-size: cover;background-repeat: none;}.wrapper {position: relative;left: 50%;width: var(--wrapper);height: 800px;-webkit-transform: translate(-50%, 0);transform: translate(-50%, 0);}.container {position: relative;top: 50%;left: 50%;width: 80%;height: 75%;background-color: var(--white);-webkit-transform: translate(-50%, -50%);transform: translate(-50%, -50%);}.container .left {float: left;width: 37.6%;height: 100%;border: 1px solid var(--light);background-color: var(--white);}.container .left .top {position: relative;width: 100%;height: 96px;padding: 29px;}.container .left .top:after {position: absolute;bottom: 0;left: 50%;display: block;width: 80%;height: 1px;content: '';background-color: var(--light);-webkit-transform: translate(-50%, 0);transform: translate(-50%, 0);}.container .left input {float: left;width: 188px;height: 42px;padding: 0 15px;border: 1px solid var(--light);background-color: #eceff1;border-radius: 21px;font-family: 'Source Sans Pro', sans-serif;font-weight: 400;}.container .left input:focus {outline: none;}.container .left a.search {display: block;float: left;width: 42px;height: 42px;margin-left: 10px;border: 1px solid var(--light);background-color: var(--blue);background-image: url("../img//name-type.png");background-repeat: no-repeat;background-position: top 12px left 14px;border-radius: 50%;}.container .left .people {margin-left: -1px;border-right: 1px solid var(--light);border-left: 1px solid var(--light);width: calc(100% + 2px);}.container .left .people .person {position: relative;width: 100%;padding: 12px 10% 16px;cursor: pointer;background-color: var(--white);}.container .left .people .person:after {position: absolute;bottom: 0;left: 50%;display: block;width: 80%;height: 1px;content: '';background-color: var(--light);-webkit-transform: translate(-50%, 0);transform: translate(-50%, 0);}.container .left .people .person img {float: left;width: 40px;height: 40px;margin-right: 12px;border-radius: 50%;}.container .left .people .person .name {font-size: 14px;line-height: 22px;color: var(--dark);font-family: 'Source Sans Pro', sans-serif;font-weight: 600;}.container .left .people .person .time {font-size: 14px;position: absolute;top: 16px;right: 10%;padding: 0 0 5px 5px;color: var(--grey);background-color: var(--white);}.container .left .people .person .preview {font-size: 14px;display: inline-block;overflow: hidden !important;width: 70%;white-space: nowrap;text-overflow: ellipsis;color: var(--grey);}.container .left .people .person.active, .container .left .people .person:hover {margin-top: -1px;margin-left: -1px;padding-top: 13px;border: 0;background-color: var(--blue);width: calc(100% + 2px);padding-left: calc(10% + 1px);}.container .left .people .person.active span, .container .left .people .person:hover span {color: var(--white);background: transparent;}.container .left .people .person.active:after, .container .left .people .person:hover:after {display: none;}.container .right {position: relative;float: left;width: 62.4%;height: 100%;}.container .right .top {width: 100%;height: 47px;padding: 15px 29px;background-color: #eceff1;}.container .right .top span {font-size: 15px;color: var(--grey);}.container .right .top span .name {color: var(--dark);font-family: 'Source Sans Pro', sans-serif;font-weight: 600;}.container .right .chat {position: relative;display: none;overflow: hidden;padding: 0 35px 92px;border-width: 1px 1px 1px 0;border-style: solid;border-color: var(--light);height: calc(100% - 48px);justify-content: flex-end;flex-direction: column;}.container .right .chat.active-chat {display: block;display: flex;}.container .right .chat.active-chat .bubble {transition-timing-function: cubic-bezier(0.4, -0.04, 1, 1);}.container .right .chat.active-chat .bubble:nth-of-type(1) {-webkit-animation-duration: 0.15s;animation-duration: 0.15s;}.container .right .chat.active-chat .bubble:nth-of-type(2) {-webkit-animation-duration: 0.3s;animation-duration: 0.3s;}.container .right .chat.active-chat .bubble:nth-of-type(3) {-webkit-animation-duration: 0.45s;animation-duration: 0.45s;}.container .right .chat.active-chat .bubble:nth-of-type(4) {-webkit-animation-duration: 0.6s;animation-duration: 0.6s;}.container .right .chat.active-chat .bubble:nth-of-type(5) {-webkit-animation-duration: 0.75s;animation-duration: 0.75s;}.container .right .chat.active-chat .bubble:nth-of-type(6) {-webkit-animation-duration: 0.9s;animation-duration: 0.9s;}.container .right .chat.active-chat .bubble:nth-of-type(7) {-webkit-animation-duration: 1.05s;animation-duration: 1.05s;}.container .right .chat.active-chat .bubble:nth-of-type(8) {-webkit-animation-duration: 1.2s;animation-duration: 1.2s;}.container .right .chat.active-chat .bubble:nth-of-type(9) {-webkit-animation-duration: 1.35s;animation-duration: 1.35s;}.container .right .chat.active-chat .bubble:nth-of-type(10) {-webkit-animation-duration: 1.5s;animation-duration: 1.5s;}.container .right .write {position: absolute;bottom: 29px;left: 30px;height: 42px;padding-left: 8px;border: 1px solid var(--light);background-color: #eceff1;width: calc(100% - 58px);border-radius: 5px;}.container .right .write input {font-size: 16px;float: left;width: 347px;height: 40px;padding: 0 10px;color: var(--dark);border: 0;outline: none;background-color: #eceff1;font-family: 'Source Sans Pro', sans-serif;font-weight: 400;}.container .right .write .write-link.attach:before {display: inline-block;float: left;width: 20px;height: 42px;content: '';background-image: url("../img/attachment.png");background-repeat: no-repeat;background-position: center;}.container .right .write .write-link.smiley:before {display: inline-block;float: left;width: 20px;height: 42px;content: '';background-image: url("../img/smiley.png");background-repeat: no-repeat;background-position: center;}.container .right .write .write-link.send:before {display: inline-block;float: left;width: 20px;height: 42px;margin-left: 11px;content: '';background-image: url("../img/send.png");background-repeat: no-repeat;background-position: center;}.container .right .bubble {font-size: 16px;position: relative;display: inline-block;clear: both;margin-bottom: 8px;padding: 13px 14px;vertical-align: top;border-radius: 5px;}.container .right .bubble:before {position: absolute;top: 19px;display: block;width: 8px;height: 6px;content: '\00a0';-webkit-transform: rotate(29deg) skew(-35deg);transform: rotate(29deg) skew(-35deg);}.container .right .bubble.you {float: left;color: var(--white);background-color: var(--blue);align-self: flex-start;-webkit-animation-name: slideFromLeft;animation-name: slideFromLeft;}.container .right .bubble.you:before {left: -3px;background-color: var(--blue);}.container .right .bubble.me {float: right;color: var(--dark);background-color: #eceff1;align-self: flex-end;-webkit-animation-name: slideFromRight;animation-name: slideFromRight;}.container .right .bubble.me:before {right: -3px;background-color: #eceff1;}.container .right .conversation-start {position: relative;width: 100%;margin-bottom: 27px;text-align: center;}.container .right .conversation-start span {font-size: 14px;display: inline-block;color: var(--grey);}.container .right .conversation-start span:before, .container .right .conversation-start span:after {position: absolute;top: 10px;display: inline-block;width: 30%;height: 1px;content: '';background-color: var(--light);}.container .right .conversation-start span:before {left: 0;}.container .right .conversation-start span:after {right: 0;}@keyframes slideFromLeft {0% {margin-left: -200px;opacity: 0;}100% {margin-left: 0;opacity: 1;}}@-webkit-keyframes slideFromLeft {0% {margin-left: -200px;opacity: 0;}100% {margin-left: 0;opacity: 1;}}@keyframes slideFromRight {0% {margin-right: -200px;opacity: 0;}100% {margin-right: 0;opacity: 1;}}@-webkit-keyframes slideFromRight {0% {margin-right: -200px;opacity: 0;}100% {margin-right: 0;opacity: 1;}}