本文实例为大家分享了js实现聊天对话框的具体代码，供大家参考，具体内容如下
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
.box{
width:300px;
height:400px;
border:1px solid blue;
margin:0 auto;
}
.inTer{
width:280px;
height:280px;
border:1px solid deeppink;
margin:0 auto;
margin-top:10px;
overflow-y:auto;
}
textarea{
display:block;
width: 276px;
height:65px;
margin:0 auto;
margin-top:5px;
}
#btn{
display:block;
float:right;
margin-right:10px;
margin-top:5px;
}
p{
display:inline-block;
border-radius:5px;
background:#dcdcdc;
font-size:12px;
padding:5px 5px;
margin:5px 0;
margin-left:5px;
max-width:140px;
word-wrap: break-word;
}
</style>
</head>
<body>
<div class="box">
<div class="inTer" id="father">
<p>你好</p ></br>
<p>你好</p ></br>
<p>你好</p ></br>
<p>heiheiheiheiehieheieheieheieheiheiehe</p ></br>
</div>
<textarea style="resize: none;" id="txt">
</textarea>
<input type="button" id="btn" value="发送" />
</div>
</body>
</html>
<script>
var btn = document.getElementById("btn");
var txt = document.getElementById("txt");
var father = document.getElementById("father")
var p = document.getElementsByTagName("p");
btn.onclick=function(){
if(txt.value==""){
alert("请勿发送空内容");
}
else{
var son = document.createElement("p");
son.style.backgroundColor="yellowgreen";
son.style.clear="both";
son.style.float="right";
son.style.marginRight="5px";
son.innerText=txt.value;
father.appendChild(son);
txt.value="";
son.scrollIntoView();
}
}
document.onkeydown=function(evt){
var e = evt || event;
e.keyCode=e.which=e.charCode;
if(e.keyCode==13 || e.keyCode==10){
if(txt.value==""){
alert("请勿发送空内容");
}
else{
var son = document.createElement("p");
son.style.backgroundColor="yellowgreen";
son.style.clear="both";
son.style.float="right";
son.style.marginRight="5px";
son.innerText=txt.value;
father.appendChild(son);
txt.value="";
son.scrollIntoView();
}
}
}
</script>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。