模板

收发消息模板（使用ejs），可以认为发消息在右边显示，收消息在左边显示。 每条消息有三部分组成：头像、名字、聊天内容。 头像和名字垂直布局，尖角和消息水平布局，消息整体水平布局，左边消息左对齐，右边消息右对齐，最后是调整各元素之间的间距。

<script id="left-message-template" type="text/template">
    <div class="left-message-row">
        <div class="avatar">
            <div class="avatar-img">
                <img src="<%= avatar %>" alt="">
            </div>
            <div class="avatar-name" data-toggle="tooltip" title="<%= name %>">
                <%= name %>
            </div>
        </div>
        <div class="message">
            <div class="left-direction"></div>
            <div class="left-message-content">
                <%= content %>
            </div>
        </div>
    </div>
</script>
<script id="right-message-template" type="text/template">
    <div class="right-message-row">
        <div class="message">
            <div class="right-message-content">
                <%= content %>
            </div>
            <div class="right-direction"></div>
        </div>
        <div class="avatar">
            <div class="avatar-img">
                <img src="<%= avatar %>" alt="">
            </div>
            <div class="avatar-name">
                <span data-toggle="tooltip" title="<%= name %>"><%= name %></span>
            </div>
        </div>
    </div>
</script>

样式

我们使用flex布局，left-direction、right-direction就是气泡的两个尖角

.left-message-row {
    display: flex;
    flex-direction: row;
}
.right-message-row {
    display: flex;
    flex-direction: row;
    justify-content: flex-end;
}
.message {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
}
.left-message-content {
    background: #BCC6D6;
    border-radius: 5px;
    padding: 10px;
    margin-top:4px;
}
.right-message-content {
    background: #A6D4F2;
    border-radius: 5px;
    padding: 10px;
    margin-top: 4px;
}
.left-direction {
    border: solid transparent;
    content: " ";
    height: 0;
    width: 0;
    pointer-events: none;
    border-color: rgba(213, 242, 239, 0);
    border-right-color: #BCC6D6;
    border-width: 8px;
    margin-left: -5px;
    margin-top: -5px;
}
.right-direction {
    border: solid transparent;
    content: " ";
    height: 0;
    width: 0;
    pointer-events: none;
    border-color: rgba(213, 242, 239, 0);
    border-left-color: #A6D4F2;
    border-width: 8px;
    margin-right: -5px;
    margin-top: -5px;
}
.avatar {
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin-top: 6px;
    min-width: 50px;
}

.clear-margin-padding {
    margin: 0px;
    padding: 0px;
}

.avatar-img img {
    width: 40px;
    height: 40px;
}
.avatar-name {
    margin-top: 4px;
    font-size: 6px;
    text-align: center;
    max-width: 100px;
    overflow:hidden;
    white-space:nowrap;
    text-overflow:ellipsis;
    -o-text-overflow:ellipsis;
}

效果图

源码

github地址，有兴趣就Star一下吧