提取表单背景颜色

src/components/app-form-item/app-form-item.less

@@ -33,7 +33,7 @@
   }
 
   --border-color: #f3f2f2;
-  --background: #fcfcfc;
+  --background: @from-main-background;
   font-family: -apple-system, "Microsoft Yahei";
 }
 .app-form-item.item-has-value {

src/components/app-mob-actionsheet/app-mob-actionsheet.less

@@ -4,7 +4,7 @@
   .cancel-icon {
     width: 16px;
     height: 16px;
-    background-color: #fcfcfc;
+    background-color: @from-main-background;
     position: absolute;
     right: 12px;
     top: 50%;

src/components/app-mob-check-list/app-mob-check-list.less

@@ -3,7 +3,7 @@
   .cancel-icon {
     width: 16px;
     height: 16px;
-    background-color: #fcfcfc;
+    background-color: @from-main-background;
     position: absolute;
     right: 12px;
     top: 50%;

src/components/app-mob-select/app-mob-select.less

@@ -3,7 +3,7 @@
   .cancel-icon {
     width: 16px;
     height: 16px;
-    background-color: #fcfcfc;
+    background-color: @from-main-background;
     position: absolute;
     right: 12px;
     top: 50%;

src/styles/var.less

@@ -5,6 +5,9 @@
 @color-main-color: #333;
 // 编辑表单默认字体颜色
 @from-main-color: #969696;
+// 编辑表单默认背景颜色
+@from-main-background: #fcfcfc;
+
 
 @color-primary: #3880ff;
 @color-primary-rgb: 56, 128, 255;