# 如果存在 build 目录就删除该目录
if [ -d build ]; then
rm -rf build; # 结尾分号！！
fi

cd dist
git init
git add .
git commit -m 'Deploy'
git remote add upstream [Upstream git URL]
git push origin gh-pages

git subtree split --prefix dist -b gh-pages # create a local gh-pages branch containing the splitted output folder
git push -f origin gh-pages:gh-pages # force the push of the gh-pages branch to the remote gh-pages branch at origin
git branch -D gh-pages

/* 微信开发工具预览正常 Iphone 正常 Android 不正常 可能和基础库版本有关系 */
background: #00000080

/* 解决方案 使用 rgba 的形式表示 */
background: rgba(0, 0, 0, 0.5);

<!-- index.xtml -->
<com id="child" />

// index.js
const child = this.selectComponent('#child')
child.go()

if ( some_variable == null ){
  // some_variable is either null or undefined
}