feat:完成生成打印纸的步骤

miniprogram/utils/index.ts

@@ -0,0 +1,36 @@
+export async function getMiniCodeImage(canvas: Canvas) {
+    return getImage(canvas, '/assets/imgs/mini-code.jpg');
+}
+
+export async function getImage(canvas: Canvas, path: string) {
+    return new Promise((resolve, reject) => {
+        const image = canvas.createImage();
+        image.onload = () => {
+            resolve(image);
+        };
+        image.onerror = () => {
+            reject('图片加载异常');
+        };
+        image.src = path;
+    });
+}
+
+export const formatTime = (date: Date) => {
+    const year = date.getFullYear();
+    const month = date.getMonth() + 1;
+    const day = date.getDate();
+    const hour = date.getHours();
+    const minute = date.getMinutes();
+    const second = date.getSeconds();
+
+    return (
+        [year, month, day].map(formatNumber).join('/') +
+        ' ' +
+        [hour, minute, second].map(formatNumber).join(':')
+    );
+};
+
+const formatNumber = (n: number) => {
+    const s = n.toString();
+    return s[1] ? s : '0' + s;
+};