我对带动画的svg-image有疑问。
图像存储在我的服务器上，如＆＃34; ajax-loader.svg＆＃34;我用一个正常的标签显示动画svg，如：
<img src="images/ajax-loader.svg" />
问题： 我第一次调用网站时，动画显示正确。但是在2-3次网站通话后，我只看到静态图像而没有动画，我不知道为什么？
SVG代码：
<?xml version="1.0" encoding="utf-8"?>
<svg width="44px" height="44px" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="xMidYMid" class="uil-default"><rect x="0" y="0" width="100" height="100" fill="none" class="bk"></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(0 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(30 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.08333333333333333s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(60 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.16666666666666666s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(90 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.25s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(120 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.3333333333333333s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(150 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.4166666666666667s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(180 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.5s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(210 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.5833333333333334s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(240 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.6666666666666666s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(270 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.75s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(300 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.8333333333333334s" repeatCount="indefinite"></animate></rect><rect x="46.5" y="40" width="7" height="20" rx="5" ry="5" fill="#000000" transform="rotate(330 50 50) translate(0 -30)"> <animate attributeName="opacity" from="1" to="0" dur="1s" begin="0.9166666666666666s" repeatCount="indefinite"></animate></rect></svg>