feat(Checkbox): add bind-group prop (#4600)

src/mixins/checkbox.js

@@ -19,10 +19,18 @@ export const CheckboxMixin = ({ parent, bem, role }) => ({
     shape: {
       type: String,
       default: 'round'
+    },
+    bindGroup: {
+      type: Boolean,
+      default: true
     }
   },
 
   computed: {
+    disableBindRelation() {
+      return !this.bindGroup;
+    },
+
     isDisabled() {
       return (this.parent && this.parent.disabled) || this.disabled;
     },

src/mixins/relation.ts

@@ -21,6 +21,10 @@ function flattenVNodes(vnodes: VNode[]) {
   return result;
 }
 
+type ChildrenMixinThis = {
+  disableBindRelation?: boolean;
+};
+
 export function ChildrenMixin(parent: string, options: ChildrenMixinOptions = {}) {
   const indexKey = options.indexKey || 'index';
 
@@ -33,6 +37,10 @@ export function ChildrenMixin(parent: string, options: ChildrenMixinOptions = {}
 
     computed: {
       parent() {
+        if ((this as ChildrenMixinThis).disableBindRelation) {
+          return null;
+        }
+
         return (this as any)[parent];
       },