【css3】--四种气泡

在聊天的场景中，聊天内容需要用到气泡修饰，如下图。下面一一讲解。

图片式：

第一个样式是京东客服，气泡的圆角和钩子都是用了图片。使用了一个table组合成了一个圆角的框框。lm样式拼出了钩子。

 <div class="jimi_lists clearfix">
                <div class="header_img jimi3 fl"></div>
                <table class="msg" cellspacing="0" cellpadding="0">
                    <tbody><tr><td class="lt"></td><td class="tt"></td><td class="rt"></td></tr>
                    <tr><td class="lm"><span></span></td><td class="mm"><span class="wel"><span class="visitor"><p>很抱歉，现在人工客服忙，让小JIMI为您解答吧。</p></span></span></td><td class="rm"></td></tr>
                    <tr><td class="lb"></td><td class="bm"></td><td class="rb"></td></tr><tr><td></td></tr>
                    </tbody>
                </table>
            </div>
            <div class="customer_lists clearfix">
                <div class="header_img jimi3" style="background: url(img/mine.jpg) no-repeat center;">
                    <div class="header_img_hover"></div>
                </div>
                <table class="msg" cellspacing="0" cellpadding="0"><tbody><tr><td class="lt"></td><td class="tt"></td><td class="rt"></td></tr><tr><td class="lm"></td><td class="mm">你好，我是stoneniqiu</td><td class="rm"><span></span></td></tr><tr><td class="lb"></td><td class="bm"></td><td class="rb"></td></tr><tr><td></td><td class="time"></td><td></td></tr></tbody></table>
            </div>

样式：

 .jimi_lists {
    margin: 0 -10px 20px 10px;
    position: relative;
}
 .jimi_lists .header_img.jimi3 {
    background: url(../img/jimi_50_3.png) no-repeat 0 0;
}
 .jimi_lists .header_img {
    width: 50px;
    height: 50px;
    position: absolute;
    top: 0;
    left: 0;
}
.fl {
    float: left;
}
 .jimi_lists .msg {
    margin-left: 59px;
    margin-right: 40px;
    margin-top: 2px;
    float: left;
    display: inline;
}
 .jimi_lists .lt {
    background: url(../img/msg_bg_lr.png) no-repeat 0 0;
    width: 26px;
    height: 10px;
}
 .jimi_lists .tt {
    background: url(../img/msg_bg_tb.png) repeat-x 0 -23px;
    height: 10px;
}
.jimi_lists .rt {
    background: url(../img/msg_bg_lr.png) no-repeat -35px 0;
    width: 10px;
    height: 10px;
}
.jimi_lists .lm {
    background: url(../img/msg_bg_lr.png) repeat-y -94px 0;
    width: 26px;
    vertical-align: top;
    position: relative;
}
.jimi_lists .mm {
    padding: 0 5px;
    background-color: #FFF;
    word-break: break-all;
    word-wrap: break-word;
    color: #333;
    line-height: 20px;
}
.jimi_lists .lm span {
    background: url(../img/msg_bg_lr.png) no-repeat 0 -14px;
    display: inline-block;
    width: 26px;
    height: 16px;
    position: absolute;
    top: 5px;
}
.jimi_lists .rm {
    background: url(../img/msg_bg_lr.png) repeat-y -113px 0;
    width: 10px;
}
.jimi_lists .lb {
    background: url(../img/msg_bg_lr.png) no-repeat 0 -43px;
    width: 10px;
    height: 10px;
}
.jimi_lists .bm {
    background: url(../img/msg_bg_tb.png) repeat-x 0 -25px;
    height: 10px;
}
.jimi_lists .rb {
    background: url(../img/msg_bg_lr.png) no-repeat -35px -43px;
    width: 10px;
    height: 10px;
}

.customer_lists {
    position: relative;
    margin: 0 12px 20px 20px;
}
.customer_lists .msg {
    float: right;
    margin-right: 73px;
    _margin-right: 38px;
    margin-top: 2px;
}
.customer_lists .lt {
    background: url(../img/msg_bg_lr.png) no-repeat -47px -0;
    width: 10px;
    height: 10px;
}
.customer_lists .tt {
    background: url(../img/msg_bg_tb.png) repeat-x 0 0;
    height: 10px;
}
.customer_lists .rt {
    background: url(../img/msg_bg_lr.png) no-repeat -63px 0;
    width: 26px;
    height: 10px;
}
.customer_lists .lm {
    background: url(../img/msg_bg_lr.png) repeat-y -126px 0;
    width: 10px;
}
.customer_lists .mm {
    padding: 1px 8px;
    background-color: #3897E7;
    word-break: break-all;
    word-wrap: break-word;
    color: #FFF;
}
.customer_lists .rm {
    background: url(../img/msg_bg_lr.png) repeat-y -129px 0;
    width: 26px;
    vertical-align: top;
    position: relative;
}
.customer_lists .lb {
    background: url(../img/msg_bg_lr.png) no-repeat -47px -36px;
    width: 10px;
    height: 10px;
}
.customer_lists .bm {
    background: url(../img/msg_bg_tb.png) repeat-x -106px -4px;
    height: 10px;
}
.customer_lists .rb {
    background: url(../img/msg_bg_lr.png) no-repeat -63px -36px;
    width: 26px;
    height: 10px;
}

.customer_lists .rm span {
    background: url(../img/msg_bg_lr.png) no-repeat -63px -14px;
    display: inline-block;
    width: 26px;
    height: 16px;
    position: absolute;
    top: 5px;
}

.customer_lists .header_img_hover {
    position: absolute;
    background: url(../img/avatar_mask_01.png);
    top: 0;
    width: 50px;
    height: 50px;
}
.customer_lists .header_img {
    position: absolute;
    top: 0;
    right: 14px;
    width: 50px;
    height: 50px;
}
 .clearfix:after {
    content: " .";
    display: block;
    clear: both;
    visibility: hidden;
    height: 0;
}

背景式：

第二种主要是使用了：before伪类画出了三角形，然后用定位拼在了一起。

  <div class="jimi_lists clearfix">
                <div class="header_img jimi3 fl"></div>
                <div class="bkbubble right">
                     <p>换个气泡如何</p>
                </div>
            </div>
            <div class="customer_lists clearfix">
                <div class="header_img jimi3" style="background: url(img/mine.jpg) no-repeat center;">
                    <div class="header_img_hover"></div>
                </div>
                <div class="bkbubble left">
                    <p>这个不错</p>
                </div>
            </div>

样式：

  .bkbubble.right p:before, .bkbubble.left p:before {
      width: 0;
    position: absolute;
    top: 12px;
    border-style: solid;
    content: "";
  }
  .bkbubble.left {
      text-align: right;
  }
 .bkbubble.right p:before {
     left: -12px;
    border-color: transparent #00bfff;
    border-width: 0 12px 12px 0;
 }
 .bkbubble.left p:before {
     right: -12px;
    border-color: transparent #00bfff;
    border-width: 0 0 12px 12px ;
 }

更多三角形：http://www.cnblogs.com/lhb25/p/css-and-css3-triangle.html

边框式：

如果要求边框颜色和背景颜色不一样呢？上面的方法就不行了，因为用:before画三角形是利用border的原理，也就是说，在上面这种方式下，气泡边上的小三形是无法呈现两种颜色的，因为他只有一个border的颜色。那就要想办法凑出一个有边框的三角形了。

  <div class="jimi_lists lim_operator clearfix">
                <div class="header_img jimi3 fl"></div>
                <div class="lim_bubble lim_shadow"><p class="lim_dot">您好，请问有什么可以帮到您？</p></div>
                <div class="lim_tale"><div class="radiusborder"></div></div>
            </div>

1.先画一个小矩形。

.lim_operator .lim_tale {
    left: -1px;
    background-color: #c8f064;
    border-color: #a5d01b;
    margin-left: 70px;
}
.lim_tale {
    position: absolute;
    width: 12px;
    height: 8px;
    overflow: hidden !important;
    top: 10px;
    z-index: 2;
    border-top-style: solid;
    border-top-width: 1px;
}

2.画出斜线。

css里面是没有斜线的，这里是用了一个园的弧形拼出来的。在一个大圆上，截取一段弧，就是一条斜线了。

.lim_operator .radiusborder {
    position: absolute;
    background-color: #EFF0F2;
    top: -29px;
    left: -94px;
    height: 160px;
    width: 160px;
    border-top-style: solid;
    border-top-width: 1px;
    border-right-style: solid;
    border-right-width: 1px;
    border-top-right-radius: 154px;
    border-color: #a5d01b;
}

叠加式：

原理就是相当于用before先画出一个有色背景，再用after画出一个白色背景，然后叠加错开顶部1-2px，这样就出现了一个有边框有背景的三角形。web 微信就是这种做法

.expression:before {
    content: '';
    position: absolute;
    left: 16px;
    top: 100%;
    margin-left: -7px;
    border: 7px solid transparent;
    border-top-color: #CFCFCF
}

.expression:after {
    content: '';
    position: absolute;
    left: 16px;
    top: 100%;
    margin-left: -7px;
    margin-top: -1px;
    border: 7px solid transparent;
    border-top-color: #FFF
}

全部源码：
http://pan.baidu.com/s/1eR7Y8Bw