SVG作圓環進度

咱們要實現的效果：

是否是有點感受。。。哈哈

動態效果是用css3來實現的，，至於進度則是用js控制stroke-dasharray屬性實現的。。

代碼以下：

首先看下HTML結構

<div class="zh-rt-main zh-rt-yellow">
    <div class="zh-svg-box zh-svg-box-lg">
        <span class="zh-percent-num">1143/1566</span>
        <strong class="zh-unit">加油開始</strong>
        <strong class="zh-percent">99%</strong>
        <svg width="260" height="260">
            <circle cx="130" cy="130" r="120" stroke-width="2" filter="url(#outGlow)"></circle>
            <circle cx="130" cy="130" r="120" stroke-width="10" stroke-linecap="round" transform="matrix(0,-1,1,0,0,260)"></circle>
        </svg>
    </div>
</div>

濾鏡效果

<svg>
    <filter id="outGlow">
        <feGaussianBlur in="SourceGraphic" stdDeviation="3" />
        <feMerge>
            <feMergeNode />
            <feMergeNode in="SourceGraphic" />
        </feMerge>
    </filter>
</svg>

對於svg不熟悉的，先看下SVG基本教程http://www.runoob.com/svg/svg...

接下來看下CSS樣式

.zh-rt-main{position: relative; width: 436px; height: 436px; margin: -36px auto 0;}
.zh-rt-main .zh-node{display: block; position: absolute; z-index: 2; width: 116px; font-size: 12px; text-align: center; opacity: 0;}
.zh-rt-main .zh-node:after{content: ""; display: block; width: 100%; height: 1px; margin-top: 5px;}
.zh-rt-main .zh-node .zh-name,
.zh-rt-main .zh-node .zh-percent-num{display: block;}
.zh-rt-main .zh-node-1{left: 160px; top: 40px; -webkit-animation: fadeIn .3s ease-out .1s forwards; animation: fadeIn .3s ease-out .1s forwards;}
.zh-rt-main .zh-node-2{right: 70px; top: 82px; -webkit-animation: fadeIn .3s ease-out .2s forwards; animation: fadeIn .3s ease-out .2s forwards;}
.zh-rt-main .zh-node-3{right: 20px; top: 138px; -webkit-animation: fadeIn .3s ease-out .3s forwards; animation: fadeIn .3s ease-out .3s forwards;}
.zh-rt-main .zh-node-4{right: 0; top: 195px; -webkit-animation: fadeIn .3s ease-out .4s forwards; animation: fadeIn .3s ease-out .4s forwards;}
.zh-rt-main .zh-node-5{right: 20px; bottom: 135px; -webkit-animation: fadeIn .3s ease-out .5s forwards; animation: fadeIn .3s ease-out .5s forwards;}
.zh-rt-main .zh-node-6{right: 70px; bottom: 75px; -webkit-animation: fadeIn .3s ease-out .6s forwards; animation: fadeIn .3s ease-out .6s forwards;}
.zh-rt-main .zh-node-7{left: 160px; bottom: 31px; -webkit-animation: fadeIn .3s ease-out .7s forwards; animation: fadeIn .3s ease-out .7s forwards;}
.zh-rt-main .zh-node-8{left: 70px; bottom: 75px; -webkit-animation: fadeIn .3s ease-out .9s forwards; animation: fadeIn .3s ease-out .9s forwards;}
.zh-rt-main .zh-node-9{left: 20px; bottom: 135px; -webkit-animation: fadeIn .3s ease-out .8s forwards; animation: fadeIn .3s ease-out .8s forwards;}
.zh-rt-main .zh-node-10{left: 0; top: 195px; -webkit-animation: fadeIn .3s ease-out 1s forwards; animation: fadeIn .3s ease-out 1s forwards;}
.zh-rt-main .zh-node-11{left: 20px; top: 138px; -webkit-animation: fadeIn .3s ease-out 1.1s forwards; animation: fadeIn .3s ease-out 1.1s forwards;}
.zh-rt-main .zh-node-12{left: 70px; top: 82px; -webkit-animation: fadeIn .3s ease-out 1.2s forwards; animation: fadeIn .3s ease-out 1.2s forwards;}

最後就JS腳本了，代碼很少，也很簡單，就是設置stroke-dasharray屬性

// 圓環進度條
function ringProcessBar() {
    var radius = 120;
    var circumference = 2 * radius * Math.PI;
    $('.zh-rt-main').each(function() {
        var curProcess = parseFloat($(this).find('.zh-svg-box .zh-percent').text()).toFixed(2) / 100;
        var dasharray1 = (circumference*(1-curProcess)).toFixed(2);
        var dasharray2 = (circumference*curProcess).toFixed(2);
        $(this).find('.zh-svg-box svg circle:eq(1)').attr('stroke-dasharray', dasharray2+','+dasharray1);
    });
}
ringProcessBar();

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