初始化（包含登录模块）

wxcomponents/vant/mixins/basic.js

@@ -0,0 +1,22 @@
+export const basic = Behavior({
+    methods: {
+        $emit(...args) {
+            this.triggerEvent(...args);
+        },
+        getRect(selector, all) {
+            return new Promise(resolve => {
+                wx.createSelectorQuery()
+                    .in(this)[all ? 'selectAll' : 'select'](selector)
+                    .boundingClientRect(rect => {
+                    if (all && Array.isArray(rect) && rect.length) {
+                        resolve(rect);
+                    }
+                    if (!all && rect) {
+                        resolve(rect);
+                    }
+                })
+                    .exec();
+            });
+        }
+    }
+});