初始化（包含登录模块）

wxcomponents/vant/common/utils.js

@@ -0,0 +1,32 @@
+export function isDef(value) {
+    return value !== undefined && value !== null;
+}
+export function isObj(x) {
+    const type = typeof x;
+    return x !== null && (type === 'object' || type === 'function');
+}
+export function isNumber(value) {
+    return /^\d+(\.\d+)?$/.test(value);
+}
+export function range(num, min, max) {
+    return Math.min(Math.max(num, min), max);
+}
+export function nextTick(fn) {
+    setTimeout(() => {
+        fn();
+    }, 1000 / 30);
+}
+let systemInfo = null;
+export function getSystemInfoSync() {
+    if (systemInfo == null) {
+        systemInfo = wx.getSystemInfoSync();
+    }
+    return systemInfo;
+}
+export function addUnit(value) {
+    if (!isDef(value)) {
+        return undefined;
+    }
+    value = String(value);
+    return isNumber(value) ? `${value}px` : value;
+}