详细问题描述
css样式中设置了背景色的话在H5发行编译时会报错，不过在浏览器运行编译时未发生错误。
错误日志：
[HBuilder] 15:14:32.364 Module build failed (from ./node_modules/postcss-loader/src/index.js):
[HBuilder] 15:14:32.365 TypeError: Cannot read property 'length' of undefined
[HBuilder] 15:14:32.371 at D:\dstproject\meiyu\pages\login\login.vue:183:2
[HBuilder] 15:14:32.371 at module.exports (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-value-parser\lib\unit.js:9:22)
[HBuilder] 15:14:32.378 at args.forEach (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-minify-gradients\dist\index.js:57:61)
[HBuilder] 15:14:32.379 at Array.forEach ()
[HBuilder] 15:14:32.385 at decl.value.walk.node (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-minify-gradients\dist\index.js:52:18)
[HBuilder] 15:14:32.386 at walk (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-value-parser\lib\walk.js:7:16)
[HBuilder] 15:14:32.393 at ValueParser.walk (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-value-parser\lib\index.js:18:3)
[HBuilder] 15:14:32.394 at optimise (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-minify-gradients\dist\index.js:40:64)
[HBuilder] 15:14:32.402 at D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:190:18
[HBuilder] 15:14:32.403 at D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:135:18
[HBuilder] 15:14:32.412 at Rule.each (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:101:16)
[HBuilder] 15:14:32.413 at Rule.walk (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:131:17)
[HBuilder] 15:14:32.421 at D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:148:24
[HBuilder] 15:14:32.422 at Root.each (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:101:16)
[HBuilder] 15:14:32.430 at Root.walk (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:131:17)
[HBuilder] 15:14:32.431 at Root.walkDecls (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:188:19)
[HBuilder] 15:14:32.441 at css (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-minify-gradients\dist\index.js:139:23)
[HBuilder] 15:14:32.442 ERROR Build failed with errors.
css代码：
background: -webkit-gradient(linear, left top, right top, from(#88a1f9), to(#9ac6ff));
background: -o-linear-gradient(left, #88a1f9, #9ac6ff);
background: linear-gradient(to rigth,#88a1f9,#9ac6ff);
[HBuilderx版本号]
2.3.3.20190923
...)
