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jq实现从容器中间扩散的方式显示文字

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.js"></script>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .wrap {
            width: 300px;
            height: 300px;
            margin: 10px auto;
            overflow: hidden;
        }

        .con {
            width: 300px;
            height: 300px;
            position: relative;
            border: 1px solid #ccc;
            padding: 5px;
        }

           .wrap1 {
               width: 300px;
               height: 300px;
               margin: 10px auto;
               overflow: hidden;
               position: relative;

           }
          .bg {
              position: absolute;
              width: 0px;
              height: 0px;
              border-radius: 150px;
              border: 250px solid #00c1de;
              top: -100px;
              left: -100px;
              animation: identifier 5s;
          }
        @-webkit-keyframes identifier {
            from {
                -webkit-transform: rotate(0deg);
            }
            to {
                -webkit-transform: rotate(720deg);
            }
        
        }

        @keyframes identifier {
            from {
                -webkit-transform: rotate(0deg);
            }
            to {
                -webkit-transform: rotate(720deg);
            }
        
        }
    </style>
</head>
<body>
<div class="wrap1">
    <div class="con">
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    </div>
    <div class="bg"></div>
</div>
<script>
    $(".bg").animate({"width": "300px", "height": "300px", "left": "-250px", "top": "-250px"}, 5000);
</script>
</body>
</html>

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原文地址：https://www.cnblogs.com/dongxiaolei/p/6708860.html