初始化（包含登录模块）

wxcomponents/vant/mixins/observer/behavior.d.ts

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+export declare const behavior: string;

wxcomponents/vant/mixins/observer/behavior.js

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+export const behavior = Behavior({
+    methods: {
+        set(data, callback) {
+            return new Promise(resolve => {
+                this.setData(data, () => {
+                    if (callback && typeof callback === 'function') {
+                        callback.call(this);
+                    }
+                    resolve();
+                });
+            });
+        }
+    }
+});

wxcomponents/vant/mixins/observer/index.d.ts

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+export declare function observe(vantOptions: any, options: any): void;

wxcomponents/vant/mixins/observer/index.js

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+import { behavior } from './behavior';
+export function observe(vantOptions, options) {
+    const { watch } = vantOptions;
+    options.behaviors.push(behavior);
+    if (watch) {
+        const props = options.properties || {};
+        Object.keys(watch).forEach(key => {
+            if (key in props) {
+                let prop = props[key];
+                if (prop === null || !('type' in prop)) {
+                    prop = { type: prop };
+                }
+                prop.observer = watch[key];
+                props[key] = prop;
+            }
+        });
+        options.properties = props;
+    }
+}