1.项目样式 scss 全部转换为 less，且移除了项目 node-sass 依赖；

2.online开发ButtonExpHandler is not defined #957；
3.关于打包后JS文件过大，导致加载缓慢的建议 #969

ant-design-vue-jeecg/src/components/chart/AreaChartTy.vue

@@ -83,6 +83,6 @@
   }
 </script>
 
-<style lang="scss" scoped>
+<style lang="less" scoped>
   @import "chart";
 </style>

ant-design-vue-jeecg/src/components/chart/MiniArea.vue

@@ -64,6 +64,6 @@
   }
 </script>
 
-<style lang="scss" scoped>
+<style lang="less" scoped>
   @import "chart";
 </style>

ant-design-vue-jeecg/src/components/chart/MiniBar.vue

@@ -71,6 +71,6 @@
   }
 </script>
 
-<style lang="scss" scoped>
+<style lang="less" scoped>
   @import "chart";
 </style>

ant-design-vue-jeecg/src/components/chart/MiniProgress.vue

@@ -34,7 +34,7 @@
   }
 </script>
 
-<style lang="scss" scoped>
+<style lang="less" scoped>
   .chart-mini-progress {
     padding: 5px 0;
     position: relative;

ant-design-vue-jeecg/src/components/chart/RankList.vue

@@ -32,7 +32,7 @@
   }
 </script>
 
-<style lang="scss" scoped>
+<style lang="less" scoped>
 
   .rank {
     padding: 0 32px 32px 72px;

ant-design-vue-jeecg/src/components/chart/Trend.vue

@@ -52,7 +52,7 @@
   }
 </script>
 
-<style lang="scss" scoped>
+<style lang="less" scoped>
   .chart-trend {
     display: inline-block;
     font-size: 14px;