增加部分样式，公共方法，增加保存员工登录保存商户号

commons/utils/safe-bottom.js

@@ -0,0 +1,26 @@
+import {
+	getCurrentInstance,
+} from 'vue';
+export function getElRect(elClass, dataVal) {
+	const instance = getCurrentInstance();
+	return new Promise((resolve, reject) => {
+		const query = uni.createSelectorQuery().in(instance.proxy);
+		query.select('.' + elClass).fields({
+			size: true
+		}, res => {
+			// 如果节点尚未生成，res值为null，循环调用执行
+			if (!res) {
+				setTimeout(() => {
+					getElRect(elClass);
+				}, 10);
+				return;
+			}
+			resolve(res);
+		}).exec();
+	})
+}
+
+export async function getSafeBottomHeight(className, height = 16) {
+	const bottomEle = await getElRect(className)
+	return bottomEle.height + height
+}