1、以上是在版本v1.02.1904090中实现的结果，svg可以正常展示
2、以上是最新版开发工具的展示结果，
svgData=data:image/svg+xml,<svg width='300' height='100' xmlns='http://www.w3.org/2000/svg'><defs><linearGradient id="orange_red" x1="0%" y1="0%" x2="0%" y2="100%"><stop offset="0%" stop-color="#fff"/><stop offset="100%" stop-color="#000"/></linearGradient></defs><path d='M0 8.25L6.25 8.25 C10.9375 8.25 12.5 8.25 18.75 8.25 C25 8.25 25 8.25 31.25 8.25 C37.5 8.25 37.5 8.25 43.75 8.25 C50 8.25 50 8.25 56.25 8.25 C62.5 8.25 62.5 5.1975 68.75 8.25 C75 11.3025 75 20.46 81.25 20.46 C87.5 20.46 87.5 9.405000000000001 93.75 8.25 C100 7.095 100 10.807500000000001 106.25 15.84 C112.5 20.8725 112.5 25.08 118.75 28.38 C125 31.68 125 30.607499999999998 131.25 29.04 C137.5 27.4725 137.5 25.8225 143.75 22.110000000000003 C150 18.397500000000004 150 14.850000000000001 156.25 14.19 C162.5 13.529999999999998 162.5 18.5625 168.75 19.47 C175 20.377499999999998 175 15.4275 181.25 17.82 C187.5 20.2125 187.5 30.36 193.75 29.04 C200 27.72 200 13.365 206.25 12.540000000000001 C212.5 11.715000000000002 212.5 21.78 218.75 25.740000000000002 C225 29.700000000000003 225 30.689999999999998 231.25 28.38 C237.5 26.07 237.5 20.5425 243.75 16.5 C250 12.4575 250 14.272499999999999 256.25 12.209999999999999 C262.5 10.147499999999999 262.5 7.672499999999999 268.75 8.25 C275 8.8275 275 9.157499999999999 281.25 14.52 C287.5 19.8825 287.5 25.905 293.75 29.7 L300 29.7' stroke-width='1' fill='none' stroke='#333'/><path d='M0 0L0 0 C0 0 0 0 300 0 L306.25 0' stroke-width='1' fill='none' stroke='rgba(51,51,51,0.2)'/><path d='M0 30L0 30 C0 30 0 30 300 30 L306.25 30' stroke-width='1' fill='none' stroke='rgba(51,51,51,0.2)'/><path d='M0 60L0 60 C0 60 0 60 300 60 L306.25 60' stroke-width='1' fill='none' stroke='rgba(51,51,51,0.2)'/><path d='M0 0 L0 8.25 L6.25 8.25 C10.9375 8.25 12.5 8.25 18.75 8.25 C25 8.25 25 8.25 31.25 8.25 C37.5 8.25 37.5 8.25 43.75 8.25 C50 8.25 50 8.25 56.25 8.25 C62.5 8.25 62.5 5.1975 68.75 8.25 C75 11.3025 75 20.46 81.25 20.46 C87.5 20.46 87.5 9.405000000000001 93.75 8.25 C100 7.095 100 10.807500000000001 106.25 15.84 C112.5 20.8725 112.5 25.08 118.75 28.38 C125 31.68 125 30.607499999999998 131.25 29.04 C137.5 27.4725 137.5 25.8225 143.75 22.110000000000003 C150 18.397500000000004 150 14.850000000000001 156.25 14.19 C162.5 13.529999999999998 162.5 18.5625 168.75 19.47 C175 20.377499999999998 175 15.4275 181.25 17.82 C187.5 20.2125 187.5 30.36 193.75 29.04 C200 27.72 200 13.365 206.25 12.540000000000001 C212.5 11.715000000000002 212.5 21.78 218.75 25.740000000000002 C225 29.700000000000003 225 30.689999999999998 231.25 28.38 C237.5 26.07 237.5 20.5425 243.75 16.5 C250 12.4575 250 14.272499999999999 256.25 12.209999999999999 C262.5 10.147499999999999 262.5 7.672499999999999 268.75 8.25 C275 8.8275 275 9.157499999999999 281.25 14.52 C287.5 19.8825 287.5 25.905 293.75 29.7 L300 29.7 L300 0Z' stroke-width='0' fill='url(#orange_red)' opacity='0.2'/></svg>
3、svg的处理方式是：svg = encodeURI(svgData).replace(/'/g, "%27");
那应该是新版工具的BUG，转成base64试试
var t = this, fs = wx.getFileSystemManager(), file = `${wx.env.USER_DATA_PATH}/`+(new Date().valueOf())+'.svg', fileData = svgData.replace(/'/g, '"').replace(/^data:image\/svg\+xml;?([^,]+)?,?/g, '').trim() res = fs.writeFile({ filePath:file, data: fileData, success(res) { console.log(res) t.setData({ svgSrc: 'data:image/svg+xml;base64,'+fs.readFileSync(file, 'base64') }) }, fail(res) { console.log(res) } })若认为该回答有用，给回答者点个[ 有用 ]，让答案帮助更多的人
svgSrc可以直接使用在image src="{{svgSrc}}"上和background:url({{svgSrc}})里
你好，麻烦提供能复现问题的代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）