环形进度条（兼容低版本浏览器的方法）

jQuery + 图片

实现原理

这种方法相对来说就比较简单了，但是也是挺麻烦的一种。

首先，我们需要一个非常冗长的一个图片……图片的内容，就是每1°旋转角度，就是一张图片…100张…

html

<div class="progressbar">
    <span>0</span>%     
</div>

　CSS

.progressbar {
    text-align: center;
    line-height: 44px; 
    width: 44px; 
    display: block; 
    background: url(progressbar.png); 
    height: 44px; 
    font-size: 14px; 
    margin-left:60px;
}
.progressbar-1 {background-position: 0px 0px;}
.progressbar-2 {background-position: -54px 0px;}
.progressbar-3 {background-position: -108px 0px;}
.progressbar-4 {background-position: -162px 0px;}
.progressbar-5 {background-position: -216px 0px;}
.progressbar-6 {background-position: -270px 0px;}
.progressbar-7 {background-position: -324px 0px;}
.progressbar-8 {background-position: -378px 0px;}
.progressbar-9 {background-position: -432px 0px;}
.progressbar-10 {background-position: -486px 0px;}
.progressbar-11 {background-position: -540px 0px;}
.progressbar-12 {background-position: -594px 0px;}
.progressbar-13 {background-position: -648px 0px;}
.progressbar-14 {background-position: -702px 0px;}
.progressbar-15 {background-position: -756px 0px;}
.progressbar-16 {background-position: -810px 0px;}
.progressbar-17 {background-position: -864px 0px;}
.progressbar-18 {background-position: -918px 0px;}
.progressbar-19 {background-position: -972px 0px;}
.progressbar-20 {background-position: -1026px 0px;}
.progressbar-21 {background-position: -1080px 0px;}
.progressbar-22 {background-position: -1134px 0px;}
.progressbar-23 {background-position: -1188px 0px;}
.progressbar-24 {background-position: -1242px 0px;}
.progressbar-25 {background-position: -1296px 0px;}
.progressbar-26 {background-position: -1350px 0px;}
.progressbar-27 {background-position: -1404px 0px;}
.progressbar-28 {background-position: -1458px 0px;}
.progressbar-29 {background-position: -1512px 0px;}
.progressbar-30 {background-position: -1566px 0px;}
.progressbar-31 {background-position: -1620px 0px;}
.progressbar-32 {background-position: -1674px 0px;}
.progressbar-33 {background-position: -1728px 0px;}
.progressbar-34 {background-position: -1782px 0px;}
.progressbar-35 {background-position: -1836px 0px;}
.progressbar-36 {background-position: -1890px 0px;}
.progressbar-37 {background-position: -1944px 0px;}
.progressbar-38 {background-position: -1998px 0px;}
.progressbar-39 {background-position: -2052px 0px;}
.progressbar-40 {background-position: -2106px 0px;}
.progressbar-41 {background-position: -2160px 0px;}
.progressbar-42 {background-position: -2214px 0px;}
.progressbar-43 {background-position: -2268px 0px;}
.progressbar-44 {background-position: -2322px 0px;}
.progressbar-45 {background-position: -2376px 0px;}
.progressbar-46 {background-position: -2430px 0px;}
.progressbar-47 {background-position: -2484px 0px;}
.progressbar-48 {background-position: -2538px 0px;}
.progressbar-49 {background-position: -2592px 0px;}
.progressbar-50 {background-position: -2700px 0px;}
.progressbar-51 {background-position: -2754px 0px;}
.progressbar-52 {background-position: -2808px 0px;}
.progressbar-53 {background-position: -2862px 0px;}
.progressbar-54 {background-position: -2916px 0px;}
.progressbar-55 {background-position: -2970px 0px;}
.progressbar-56 {background-position: -3024px 0px;}
.progressbar-57 {background-position: -3078px 0px;}
.progressbar-58 {background-position: -3132px 0px;}
.progressbar-59 {background-position: -3186px 0px;}
.progressbar-60 {background-position: -3240px 0px;}
.progressbar-61 {background-position: -3294px 0px;}
.progressbar-62 {background-position: -3348px 0px;}
.progressbar-63 {background-position: -3402px 0px;}
.progressbar-64 {background-position: -3456px 0px;}
.progressbar-65 {background-position: -3510px 0px;}
.progressbar-66 {background-position: -3564px 0px;}
.progressbar-67 {background-position: -3618px 0px;}
.progressbar-68 {background-position: -3672px 0px;}
.progressbar-69 {background-position: -3726px 0px;}
.progressbar-70 {background-position: -3780px 0px;}
.progressbar-71 {background-position: -3834px 0px;}
.progressbar-72 {background-position: -3888px 0px;}
.progressbar-73 {background-position: -3942px 0px;}
.progressbar-74 {background-position: -3996px 0px;}
.progressbar-75 {background-position: -4050px 0px;}
.progressbar-76 {background-position: -4104px 0px;}
.progressbar-77 {background-position: -4158px 0px;}
.progressbar-78 {background-position: -4212px 0px;}
.progressbar-79 {background-position: -4266px 0px;}
.progressbar-80 {background-position: -4320px 0px;}
.progressbar-81 {background-position: -4376px 0px;}
.progressbar-82 {background-position: -4428px 0px;}
.progressbar-83 {background-position: -4482px 0px;}
.progressbar-84 {background-position: -4536px 0px;}
.progressbar-85 {background-position: -4590px 0px;}
.progressbar-86 {background-position: -4644px 0px;}
.progressbar-87 {background-position: -4698px 0px;}
.progressbar-88 {background-position: -4752px 0px;}
.progressbar-89 {background-position: -4806px 0px;}
.progressbar-90 {background-position: -4860px 0px;}
.progressbar-91 {background-position: -4914px 0px;}
.progressbar-92 {background-position: -4968px 0px;}
.progressbar-93 {background-position: -5022px 0px;}
.progressbar-94 {background-position: -5076px 0px;}
.progressbar-95 {background-position: -5130px 0px;}
.progressbar-96 {background-position: -5184px 0px;}
.progressbar-97 {background-position: -5238px 0px;}
.progressbar-98 {background-position: -5292px 0px;}
.progressbar-99 {background-position: -5346px 0px;}
.progressbar-100 {background-position: -5400px 0px;}

　　JavaScript

$(function() {
    $('.progressbar').each(function(index, el) {
        var num = $(this).find('span').text();
        $(this).addClass('progressbar-' + num);
    });
});

　　虽然这种方法虽然比较繁琐比较麻烦，但是兼容性也更好。