JQuery实现聊天对话框

效果图如下:

HTML代码如下:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style type="text/css">
        .talk_con{
            width:600px;
            height:500px;
            border:1px solid #666;
            margin:50px auto 0;
            background:#f9f9f9;
        }
        .talk_show{
            width:580px;
            height:420px;
            border:1px solid #666;
            background:#fff;
            margin:10px auto 0;
            overflow:auto;
        }
        .talk_input{
            width:580px;
            margin:10px auto 0;
        }
        .whotalk{
            width:80px;
            height:30px;
            float:left;
            outline:none;
        }
        .talk_word{
            width:420px;
            height:26px;
            padding:0px;
            float:left;
            margin-left:10px;
            outline:none;
            text-indent:10px;
        }        
        .talk_sub{
            width:56px;
            height:30px;
            float:left;
            margin-left:10px;
        }
        .atalk{
           margin:10px; 
        }
        .atalk span{
            display:inline-block;
            background:#0181cc;
            border-radius:10px;
            color:#fff;
            padding:5px 10px;
        }
        .btalk{
            margin:10px;
            text-align:right;
        }
        .btalk span{
            display:inline-block;
            background:#ef8201;
            border-radius:10px;
            color:#fff;
            padding:5px 10px;
        }
    </style>
    <script src="js/jquery-1.12.4.min.js"></script>
    <script type="text/javascript">      
    // 写出对应功能代码  
    $(function(){
        // 发送按钮单击,获取用户输入的数据,显示到上面的区域
        var $talksub = $('#talksub')
        var $words = $('#words')
        $talksub.click(function(){
            var vals = $('#talkwords').val()
            alert(vals)
            // 如果是a说 value==0,就显示a的样式的文字
            var whoVal = $('#who').val()
            var str = ''
            if(vals == '')
            {
                alert('请输入内容')
                return
            }



            if(whoVal ==0)
            {
                str = '<div class="atalk"><span>A说:'+vals+'</span></div>'
            }
            else
            {
                str = '<div class="btalk"><span>B说:'+vals+'</span></div>'
            }
            // 原有内容的基础上加上 str
            $words.html( $words.html() + str )
        })
    })
    </script>
</head>
<body>
    <div class="talk_con">
        <div class="talk_show" id="words">
            <div class="atalk"><span>A说:吃饭了吗?</span></div>
            <div class="btalk"><span>B说:还没呢,你呢?</span></div>
        </div>
        <div class="talk_input">
            <select class="whotalk" id="who">
                <option value="0">A说:</option>
                <option value="1">B说:</option>
            </select>
            <input type="text" class="talk_word" id="talkwords">
            <input type="button" value="发送" class="talk_sub" id="talksub">
        </div>
    </div>
</body>
</html>

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