1 用utf8格式， 需要 双引号“”替换为单引号，而且采用url encode编码，例如# 替换为 %23，
background-image: url('data:image/svg+xml;utf8,<svg t="1656040038219" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="3009" width="200" height="200"><path d="M512 234.666667c131.946667 ...67 77.482667 0 1 0 0 154.944 77.482667 77.482667 0 0 0 0-154.944z" p-id="3010" fill="%23bfbfbf"></path></svg>');
2 用base64格式， 把<svg>... </svg> 用btoa() 转换为base64编码
background-image:
url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHiaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiB3aWR0aD0iMTA2MHB4IiBoZWlnaHQ9IjU4MHB4IiB2aWV3Qm94PSIwIDAgIDEw==");
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