fix(checkboxgroup): fix a bug when checkboxgroup set the min props (#705)

set the min props in checkboxgroup. And checkboxgroup will add value in checkList when repeatedly
click the selected checkbox

src/components/checkbox-group/checkbox-group.vue

@@ -81,14 +81,14 @@
     },
     mounted () {
       this.$on(EVENT_CHECKED, (value) => {
-        if (this._value.length < this.max) {
+        if (this._value.length < this.max && this._value.indexOf(value) === -1) {
           this._value.push(value)
         }
         this.$emit(EVENT_INPUT, this._value)
       })
       this.$on(EVENT_CANCLE_CHECKED, (value) => {
-        if (this._value.length > this.min) {
-          const index = this._value.indexOf(value)
+        const index = this._value.indexOf(value)
+        if (this._value.length > this.min && index > -1) {
           this._value.splice(index, 1)
         }
         this.$emit(EVENT_INPUT, this._value)

src/components/checkbox/checkbox.vue

@@ -92,9 +92,11 @@
         set (newValue) {
           const value = this.computedOption.value
           const emitValue = value && newValue ? value : newValue
-          const parentEmitEvent = newValue ? EVENT_CHECKED : EVENT_CANCLE_CHECKED
           this.$emit(EVENT_INPUT, emitValue)
           if (this.isInGroup) {
+            // fix a bug when checkboxgroup set the min props
+            newValue = !this.checkValue
+            const parentEmitEvent = newValue ? EVENT_CHECKED : EVENT_CANCLE_CHECKED
             this.$parent.$emit(parentEmitEvent, value || newValue)
           }
         }