p id="se_lev"安全级别 ：span id="big"span id="min"/span/span高/p
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span#big { vertical-align:middle; display:inline-block; margin-left:6px; margin-right:20px; width:183px; height:14px; border:2px solid #a4a4a4; border-radius:14px; behavior: url(PIE.htc);}
span#min { display:block; height:100%; width:70%; background:#fe0002; border-top-left-radius:14px; border-bottom-left-radius:14px; behavior: url(PIE.htc);
原理：大盒子里套个小盒子，
大盒子给固定宽
小盒子的宽用%表示，（利用宽度的继承性，比如50%，就只有大盒一半宽）
这个css 里的50% 将来是要用来用js动态化的，一但动态起来，就达成了进度条的效果了
如果不考虑IE的话，用css3应该不难：1、边框用背景图或纯色都可以，配合圆角和阴影；2、里面的进度条可以用垂直方向的线性渐变及阴影配合实现；3、最后配合js动态修改里面进度条div的宽度和文字的显示即可。
section class="container"
div class="progress"
span style="width: 20%;"span20%/span/span
/div
div class="progress"
span class="green" style="width: 40%;"span40%/span/span
/div
div class="progress"
span class="orange" style="width: 60%;"span60%/span/span
/div
div class="progress"
span class="red" style="width: 80%;"span80%/span/span
/div
div class="progress"
span class="blue" style="width: 100%;"span100%/span/span
/div
/section
从HTML结构中我们可以看出，类名为progress的div是整个进度条的父容器，里面的span则是当前进度，通过width来定义不同的进度值，同时定义不同的颜色类，比如orange，以便待会在CSS中进行样式渲染。
CSS代码：
.progress {
height: 20px;
background: #ebebeb;
border-left: 1px solid transparent;
border-right: 1px solid transparent;
border-radius: 10px;
}
.progress span {
position: relative;
float: left;
margin: 0 -1px;
min-width: 30px;
height: 18px;
line-height: 16px;
text-align: right;
background: #cccccc;
border: 1px solid;
border-color: #bfbfbf #b3b3b3 #9e9e9e;
border-radius: 10px;
background-image: -webkit-linear-gradient(top, #f0f0f0 0%, #dbdbdb 70%, #cccccc 100%);
background-image: -moz-linear-gradient(top, #f0f0f0 0%, #dbdbdb 70%, #cccccc 100%);
background-image: -o-linear-gradient(top, #f0f0f0 0%, #dbdbdb 70%, #cccccc 100%);
background-image: linear-gradient(to bottom, #f0f0f0 0%, #dbdbdb 70%, #cccccc 100%);
-webkit-box-shadow: inset 0 1px rgba(255, 255, 255, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
box-shadow: inset 0 1px rgba(255, 255, 255, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
}
.progress span span {
padding: 0 8px;
font-size: 11px;
font-weight: bold;
color: #404040;
color: rgba(0, 0, 0, 0.7);
text-shadow: 0 1px rgba(255, 255, 255, 0.4);
}
.progress span:before {
content: '';
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
z-index: 1;
height: 18px;
background: url("../img/progress.png") 0 0 repeat-x;
border-radius: 10px;
}
.progress .green {
background: #85c440;
border-color: #78b337 #6ba031 #568128;
background-image: -webkit-linear-gradient(top, #b7dc8e 0%, #99ce5f 70%, #85c440 100%);
background-image: -moz-linear-gradient(top, #b7dc8e 0%, #99ce5f 70%, #85c440 100%);
background-image: -o-linear-gradient(top, #b7dc8e 0%, #99ce5f 70%, #85c440 100%);
background-image: linear-gradient(to bottom, #b7dc8e 0%, #99ce5f 70%, #85c440 100%);
}
.progress .red {
background: #db3a27;
border-color: #c73321 #b12d1e #8e2418;
background-image: -webkit-linear-gradient(top, #ea8a7e 0%, #e15a4a 70%, #db3a27 100%);
background-image: -moz-linear-gradient(top, #ea8a7e 0%, #e15a4a 70%, #db3a27 100%);
background-image: -o-linear-gradient(top, #ea8a7e 0%, #e15a4a 70%, #db3a27 100%);
background-image: linear-gradient(to bottom, #ea8a7e 0%, #e15a4a 70%, #db3a27 100%);
}
.progress .orange {
background: #f2b63c;
border-color: #f0ad24 #eba310 #c5880d;
background-image: -webkit-linear-gradient(top, #f8da9c 0%, #f5c462 70%, #f2b63c 100%);
background-image: -moz-linear-gradient(top, #f8da9c 0%, #f5c462 70%, #f2b63c 100%);
background-image: -o-linear-gradient(top, #f8da9c 0%, #f5c462 70%, #f2b63c 100%);
background-image: linear-gradient(to bottom, #f8da9c 0%, #f5c462 70%, #f2b63c 100%);
}
.progress .blue {
background: #5aaadb;
border-color: #459fd6 #3094d2 #277db2;
background-image: -webkit-linear-gradient(top, #aed5ed 0%, #7bbbe2 70%, #5aaadb 100%);
background-image: -moz-linear-gradient(top, #aed5ed 0%, #7bbbe2 70%, #5aaadb 100%);
background-image: -o-linear-gradient(top, #aed5ed 0%, #7bbbe2 70%, #5aaadb 100%);
background-image: linear-gradient(to bottom, #aed5ed 0%, #7bbbe2 70%, #5aaadb 100%);
}