小编给大家分享一下js如何实现简易聊天对话框，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
1、能够嵌入动态文本于HTML页面。2、对浏览器事件做出响应。3、读写HTML元素。4、在数据被提交到服务器之前验证数据。5、检测访客的浏览器信息。6、控制cookies，包括创建和修改等。7、基于Node.js技术进行服务器端编程。
具体内容如下
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>聊天对话框</title> <style type="text/css"> *{font-size: 14px; padding:0; margin:0;} .main{ position: relative; margin: 20px auto; border: 1px solid steelblue; width: 430px; height: 400px; } .msgInput{ display: block; width: 406px; height: 60px; margin: 10px auto; } .sendbtn{ position: absolute; width: 100px; height: 29px; bottom: 5px; right: 10px; } .content{ list-style: none; width: 410px; height: 280px; margin: 5px auto; border: 1px dotted #D1D3D6; overflow-y: scroll; } .msgContent{ width:auto; max-width: 250px; height: auto; word-break: break-all; margin: 5px; padding: 3px; border-radius: 5px; } .content .left{ float: left; text-align: left; background-color: lightgrey; } .content .right{ float: right; text-align: right; background-color: yellowgreen; } </style> <script type="text/javascript"> window.onload=function(){ var input = document.getElementById('msg_input');//查找缓存 document.getElementById('sendbtn').onclick=function () { //var input1 = document.getElementById('msg_input');// //input0 sendMsg(); } //快捷键 发送 document.onkeypress = function (event) { var e = event || window.event; var keycode = e.keyCode || e.which; console.log(e) if( keycode==10){//判断同时按下ctrl 和enter sendMsg() } } function sendMsg() { var input = document.getElementById('msg_input');//查找缓存 var ul = document.getElementById('content'); var newLi = document.createElement('li'); newLi.innerHTML = input.value; newLi.className = 'msgContent right'; ul.appendChild(newLi); var div = document.createElement('div'); div.style = 'clear:both'; ul.appendChild(div); ajax({ url:'http://jisuznwd.market.alicloudapi.com/iqa/query?question='+input.value, success:function (res) { // console.log(res) var obj = JSON.parse(res); console.log(obj) var array = obj.result.content; // var zhengzhou = array[0]; var tmp = array; // var tmp = '温度:'+zhengzhou.day_air_temperature+','+zhengzhou.day_weather; console.log(tmp) var newLi = document.createElement('li'); newLi.innerHTML = tmp; newLi.className = 'msgContent left'; ul.appendChild(newLi); var div = document.createElement('div'); div.style = 'clear:both'; ul.appendChild(div); input.value = ''; newLi.scrollIntoView();//将元素滚动到可见位置 } }) input.value = ''; newLi.scrollIntoView();//将元素滚动到可见位置 } } function ajax(obj) { //?lastCursor=6610&pageSize=10 // var url = 'reg.php'; var xhr = null; if(window.ActiveXObject){ xhr = new ActiveXObject('Microsoft.XMLHTTP') }else{ xhr = new XMLHttpRequest(); } // $username = $_REQUEST['username']; // $password = $_REQUEST['password']; //打开与服务器的连接 if(obj.method){ xhr.open(obj.method,obj.url,true); }else{ xhr.open('get',obj.url,true); } xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); xhr.setRequestHeader("Authorization","APPCODE 3e9dfb924f464e9593a95f9d2bbf4348") // {username:'zhangsa',password:123123} // sendData = encodeURIComponent(sendData); // 发送请求 //console.log(res); //回调函数 xhr.onreadystatechange = function () { // console.log(xhr.readyState) if(xhr.readyState == 4){ //数据接收完毕 if(xhr.status == 200){ // console.log('请求成功',xhr.responseText) if(obj.success){ obj.success(xhr.responseText) } }else{ // console.log(xhr.status,'请求出错') if(obj.failure){ obj.failure('请求失败') } } } } // var sendData = 'username=zhangsan&password=123456'; if( obj.method == undefined ||obj.method.toLowerCase() =='get'){ xhr.send(null);// }else{ xhr.send(obj.params);// } } </script> </head> <body> <div id="main" class="main"> <ul id="content" class="content"> <li class="msgContent left">hello?</li> <div ></div> <li class="msgContent left">hello</li> <div ></div> <li class="msgContent right">hi</li> <div ></div> <li class="msgContent left">hehe</li> <div ></div> <li class="msgContent left">goodbye</li> <div ></div> <li class="msgContent right">。。。。</li> <div ></div> <li class="msgContent right">sdfasdsadfd fasd fasd fasdfasdfasdf</li> <div ></div> <li class="msgContent right"> 哈哈</li> <div ></div> </ul> <textarea id="msg_input" class="msgInput"></textarea> <button id="sendbtn" class="sendbtn">发送</button> </div> </body> </html>看完了这篇文章，相信你对“js如何实现简易聊天对话框”有了一定的了解，如果想了解更多相关知识，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
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