【JavaScript】HTML5/CSS3实现五彩进度条应用

今天要介绍的是一款基于HTML5和CSS3的进度条应用，这款进度条是静态的，仅提供进度条的五彩外观。当然你可以在CSS中动态设置进度值来让其变得动态，一个很好的实现方式是利用jQuery动态改变CSS中的进度值，让进度条实时动起来。具体效果大家可以看演示。

你也可以在这里查看在线演示

接下来我们来分析一下这款进度条的源代码以及实现思路，代码主要由HTML和CSS组成，如果你需要动态改变进度值，也可以自己添加Javascript代码，也是比较简单的。

HTML代码：

<section class="container">
    <div class="progress">
      <span style="width: 20%;"><span>20%</span></span>
    </div>

    <div class="progress">
      <span class="green" style="width: 40%;"><span>40%</span></span>
    </div>

    <div class="progress">
      <span class="orange" style="width: 60%;"><span>60%</span></span>
    </div>

    <div class="progress">
      <span class="red" style="width: 80%;"><span>80%</span></span>
    </div>

    <div class="progress">
      <span class="blue" style="width: 100%;"><span>100%</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%);
}

这里我们对前面HTML中定义的不同颜色的进度条进行了CSS定义，设置背景颜色、边框颜色以及利用linear-gradient属性设置线性渐变的背景。看起来CSS代码非常简单，也没有太多CSS3的东西。以上只是核心代码，你也可以自己下载完整的代码研究。源码下载>>

http://www.cnblogs.com/html5tricks/p/3913829.html