[bugfix] 父级改变子级checked值时，增加parentCheckedToChildren属性，判断子级是否需要重新设置父级checked属性

Author: odanzhou

src/components/tree.vue

@@ -97,6 +97,7 @@ export default {
             if (halfcheck) {
               this.$set(child, "halfcheck", false);
             }
+            this.$set(child, "parentCheckedToChildren", true);
           }
           if (this.allowCheckedChildrenOfDisabledChild) {
             this.childCheckedHandle(child, checked, halfcheck);
@@ -105,9 +106,9 @@ export default {
       }
     },
     parentCheckedHandle(parentNode, checked, halfcheck = false) {
-      if (!parentNode || parentNode.chkDisabled) return false;
+      if (!parentNode || parentNode.chkDisabled || !!parentNode.checked === checked ) return false;
       let [someBortherNodeChecked, allBortherNodeChecked] = [checked, checked];
-      const childNodes = parentNode.children;
+      const childNodes = parentNode.children
       if (checked) {
         allBortherNodeChecked = childNodes.every(
           child => child.checked && !child.halfcheck

src/components/treeLi.vue

@@ -239,10 +239,13 @@ export default {
       this.parentChecked(parentNode, checked, halfcheck);
     },
     checkedChange() {
-      const { checked = false } = this.item;
-      if(!this.scoped) {
+      const { checked = false, parentCheckedToChildren = false } = this.item;
+      if(!this.scoped || !parentCheckedToChildren) {
         this.theParentChecked(checked, this.halfcheck);
       }
+      if(parentCheckedToChildren) {
+        this.$delete(this.item, 'parentCheckedToChildren')
+      }
     }
   }
 };