支持BI.useContext

src/core/4.widget.js

@@ -784,33 +784,34 @@
     };
 
     BI.watch = function (vm, watch, handler) {
-        if (vm instanceof BI.Model) {
-            var watchers = [];
-            if (BI.isKey(watch)) {
-                var k = watch;
-                watch = {};
-                watch[k] = handler;
-            }
-            for (var key in watch) {
-                var innerHandler = watch[key];
-                if (BI.isArray(handler)) {
-                    for (var i = 0; i < handler.length; i++) {
+        // 必须要保证组件当前环境存在
+        if (BI.Widget.current) {
+            if (vm instanceof BI.Model) {
+                var watchers = [];
+                if (BI.isKey(watch)) {
+                    var k = watch;
+                    watch = {};
+                    watch[k] = handler;
+                }
+                for (var key in watch) {
+                    var innerHandler = watch[key];
+                    if (BI.isArray(handler)) {
+                        for (var i = 0; i < handler.length; i++) {
+                            watchers.push(Fix.watch(vm.model, key, innerHandler, {
+                                store: vm
+                            }));
+                        }
+                    } else {
                         watchers.push(Fix.watch(vm.model, key, innerHandler, {
                             store: vm
                         }));
                     }
-                } else {
-                    watchers.push(Fix.watch(vm.model, key, innerHandler, {
-                        store: vm
-                    }));
                 }
+                // vm中一定有_widget
+                BI.Widget.current._watchers || (BI.Widget.current._watchers = []);
+                BI.Widget.current._watchers = BI.Widget.current._watchers.concat(watchers);
+                return;
             }
-            // vm中一定有_widget
-            vm._widget._watchers || (vm._widget._watchers = []);
-            vm._widget._watchers = vm._widget._watchers.concat(watchers);
-            return;
-        }
-        if (BI.Widget.current) {
             handler = watch;
             watch = vm;
             BI.Widget.current.$watchDelayCallbacks || (BI.Widget.current.$watchDelayCallbacks = []);