js: add generated child remove api

doric-web/dist/index.js

@@ -1961,6 +1961,14 @@ class Group extends Superview {
     addChild(view) {
         this.children.push(view);
     }
+    removeChild(view) {
+        const ret = this.children.filter(e => e !== view);
+        this.children.length = 0;
+        ret.forEach(e => this.addChild(e));
+    }
+    removeAllChildren() {
+        this.children.length = 0;
+    }
 }
 
 const SPECIFIED = 1;