Mint UI 是基于 Vue.js 的移动端组件库，有时候我们需要修改它的默认样式，方法如下：

1. 安装sass的依赖包(前提：已安装node环境)

由于sass-loader依赖于node-sass，所以先安装node-sass:
  cnpm install --save-dev node-sass ​​​​​​​

安装sass-loader:  
  cnpm install --save-dev sass-loader

2. 在src/assets/css目录下新建scss文件，如：my-mint.scss，内容如下：

/* 覆盖mint-ui的primary颜色，改为自己UI的主题色 */
$color-primary: orange;
 
.mint-header {
  background-color: $color-primary;
}
.mint-button:not(.is-disabled):active::after {
    opacity: .2 /* .6 */
}
.mint-button--primary {
    background-color: $color-primary;
}
.mint-button--primary.is-plain {
    border: 1px solid $color-primary;
    color: $color-primary
}
.mint-badge.is-primary {
  background-color: $color-primary
}
.mint-switch-input:checked + .mint-switch-core {
  border-color: $color-primary;
  background-color: $color-primary;
}
.mint-navbar .mint-tab-item.is-selected {
  border-bottom: 3px solid $color-primary;
  color: $color-primary;
}
.mint-tabbar > .mint-tab-item.is-selected {
  color: $color-primary;
}
.mint-searchbar-cancel {
  color: $color-primary;
}
.mint-checkbox-input:checked + .mint-checkbox-core {
  background-color: $color-primary;
  border-color: $color-primary;
}
.mint-radio-input:checked + .mint-radio-core {
  background-color: $color-primary;
  border-color: $color-primary;
}
.mt-range-progress {
  background-color: $color-primary;
}
.mt-progress-progress {
  background-color: $color-primary;
}
.mint-msgbox-confirm {
  color: $color-primary;
}
.mint-msgbox-confirm:active {
  color: $color-primary;
}
.mint-datetime-action {
  color: $color-primary;
}

3. 在main.js中引入自定义的scss文件

import './assets/css/my-mint.scss';//全局修改mint-UI样式