在小程序中，如何使用svg图标

其实在小程序中使用svg图标，可以先将 svg 图标转成 base64 格式，然后使用css的 background-image 或者 mask-image 显示svg图标，使用mask方式支持改变图标颜色。

使用工具 image-to-base64 将svg图标转成base64，直接上传文件或粘贴文件内容都可以。

转成base64

<?xml version="1.0" encoding="UTF-8"?><svg width="20" height="20" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M24 4L18 10H10V18L4 24L10 30V38H18L24 44L30 38H38V30L44 24L38 18V10H30L24 4Z" fill="none" stroke="#333" stroke-width="3" stroke-linejoin="round"/><path d="M24 30C27.3137 30 30 27.3137 30 24C30 20.6863 27.3137 18 24 18C20.6863 18 18 20.6863 18 24C18 27.3137 20.6863 30 24 30Z" fill="none" stroke="#333" stroke-width="3" stroke-linejoin="round"/></svg>
// => data:image/svg+xml,%3C%3Fxml version="1.0" encoding="UTF-8"%3F%3E%3Csvg width="20" height="20" viewBox="0 0 48 48" fill="none" xmlns="http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg"%3E%3Cpath d="M15 12L18 6H30L33 12H15Z" fill="none" stroke="%23333" stroke-width="3" stroke-linejoin="round"%2F%3E%3Crect x="4" y="12" width="40" height="30" rx="3" fill="none" stroke="%23333" stroke-width="3" stroke-linejoin="round"%2F%3E%3Cpath d="M24 35C28.4183 35 32 31.4183 32 27C32 22.5817 28.4183 19 24 19C19.5817 19 16 22.5817 16 27C16 31.4183 19.5817 35 24 35Z" fill="none" stroke="%23333" stroke-width="3" stroke-linejoin="round"%2F%3E%3C%2Fsvg%3E

在小程序中使用

.icon {
    mask-repeat: no-repeat;
    mask-size: contain;
    mask-image: url("data:image/svg+xml,%3C%3Fxml version='1.0' encoding='UTF-8'%3F%3E%3Csvg width='80px' height='80px' viewBox='0 0 80 80' version='1.1' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink'%3E%3Ctitle%3Eloading%3C/title%3E%3Cdefs%3E%3ClinearGradient x1='94.0869141%25' y1='0%25' x2='94.0869141%25' y2='90.559082%25' id='linearGradient-1'%3E%3Cstop stop-color='%23606060' stop-opacity='0' offset='0%25'%3E%3C/stop%3E%3Cstop stop-color='%23606060' stop-opacity='0.3' offset='100%25'%3E%3C/stop%3E%3C/linearGradient%3E%3ClinearGradient x1='100%25' y1='8.67370605%25' x2='100%25' y2='90.6286621%25' id='linearGradient-2'%3E%3Cstop stop-color='%23606060' offset='0%25'%3E%3C/stop%3E%3Cstop stop-color='%23606060' stop-opacity='0.3' offset='100%25'%3E%3C/stop%3E%3C/linearGradient%3E%3C/defs%3E%3Cg stroke='none' stroke-width='1' fill='none' fill-rule='evenodd' opacity='0.9'%3E%3Cg%3E%3Cpath d='M40,0 C62.09139,0 80,17.90861 80,40 C80,62.09139 62.09139,80 40,80 L40,73 C58.2253967,73 73,58.2253967 73,40 C73,21.7746033 58.2253967,7 40,7 L40,0 Z' fill='url(%23linearGradient-1)'%3E%3C/path%3E%3Cpath d='M40,0 L40,7 C21.7746033,7 7,21.7746033 7,40 C7,58.2253967 21.7746033,73 40,73 L40,80 C17.90861,80 0,62.09139 0,40 C0,17.90861 17.90861,0 40,0 Z' fill='url(%23linearGradient-2)'%3E%3C/path%3E%3Ccircle id='Oval' fill='%23606060' cx='40.5' cy='3.5' r='3.5'%3E%3C/circle%3E%3C/g%3E%3CanimateTransform attributeName='transform' begin='0s' dur='1s' type='rotate' values='0 40 40;360 40 40' repeatCount='indefinite'/%3E%3C/g%3E%3C/svg%3E%0A");
    // 设置颜色
    background-color: #000
}

// 或者
.icon {
    background-image: url("data:image/svg+xml,%3C%3Fxml version='1.0' encoding='UTF-8'%3F%3E%3Csvg width='80px' height='80px' viewBox='0 0 80 80' version='1.1' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink'%3E%3Ctitle%3Eloading%3C/title%3E%3Cdefs%3E%3ClinearGradient x1='94.0869141%25' y1='0%25' x2='94.0869141%25' y2='90.559082%25' id='linearGradient-1'%3E%3Cstop stop-color='%23606060' stop-opacity='0' offset='0%25'%3E%3C/stop%3E%3Cstop stop-color='%23606060' stop-opacity='0.3' offset='100%25'%3E%3C/stop%3E%3C/linearGradient%3E%3ClinearGradient x1='100%25' y1='8.67370605%25' x2='100%25' y2='90.6286621%25' id='linearGradient-2'%3E%3Cstop stop-color='%23606060' offset='0%25'%3E%3C/stop%3E%3Cstop stop-color='%23606060' stop-opacity='0.3' offset='100%25'%3E%3C/stop%3E%3C/linearGradient%3E%3C/defs%3E%3Cg stroke='none' stroke-width='1' fill='none' fill-rule='evenodd' opacity='0.9'%3E%3Cg%3E%3Cpath d='M40,0 C62.09139,0 80,17.90861 80,40 C80,62.09139 62.09139,80 40,80 L40,73 C58.2253967,73 73,58.2253967 73,40 C73,21.7746033 58.2253967,7 40,7 L40,0 Z' fill='url(%23linearGradient-1)'%3E%3C/path%3E%3Cpath d='M40,0 L40,7 C21.7746033,7 7,21.7746033 7,40 C7,58.2253967 21.7746033,73 40,73 L40,80 C17.90861,80 0,62.09139 0,40 C0,17.90861 17.90861,0 40,0 Z' fill='url(%23linearGradient-2)'%3E%3C/path%3E%3Ccircle id='Oval' fill='%23606060' cx='40.5' cy='3.5' r='3.5'%3E%3C/circle%3E%3C/g%3E%3CanimateTransform attributeName='transform' begin='0s' dur='1s' type='rotate' values='0 40 40;360 40 40' repeatCount='indefinite'/%3E%3C/g%3E%3C/svg%3E%0A")
}