小程序二维码功能

2026-07-12 23:59:52 +08:00
parent 1bd152073a
commit f2cdc0222d
10 changed files with 658 additions and 63 deletions
@@ -0,0 +1,52 @@
+/** 微信小程序基础库未内置 TextEncoder，qrcode 库依赖它编码 payload */
+function installTextEncodingPolyfill() {
+  const root = (typeof globalThis !== 'undefined'
+    ? globalThis
+    : typeof global !== 'undefined'
+      ? global
+      : typeof wx !== 'undefined'
+        ? wx
+        : {}) as typeof globalThis & { TextEncoder?: typeof TextEncoder };
+
+  if (typeof root.TextEncoder !== 'undefined') return;
+
+  class MiniTextEncoder implements TextEncoder {
+    readonly encoding = 'utf-8';
+
+    encode(input?: string): Uint8Array {
+      const str = input ?? '';
+      const bytes: number[] = [];
+      for (let i = 0; i < str.length; i++) {
+        let code = str.charCodeAt(i);
+        if (code < 0x80) {
+          bytes.push(code);
+        } else if (code < 0x800) {
+          bytes.push(0xc0 | (code >> 6), 0x80 | (code & 0x3f));
+        } else if (code >= 0xd800 && code <= 0xdbff && i + 1 < str.length) {
+          const next = str.charCodeAt(i + 1);
+          if (next >= 0xdc00 && next <= 0xdfff) {
+            i += 1;
+            code = 0x10000 + ((code - 0xd800) << 10) + (next - 0xdc00);
+            bytes.push(
+              0xf0 | (code >> 18),
+              0x80 | ((code >> 12) & 0x3f),
+              0x80 | ((code >> 6) & 0x3f),
+              0x80 | (code & 0x3f),
+            );
+          } else {
+            bytes.push(0xe0 | (code >> 12), 0x80 | ((code >> 6) & 0x3f), 0x80 | (code & 0x3f));
+          }
+        } else {
+          bytes.push(0xe0 | (code >> 12), 0x80 | ((code >> 6) & 0x3f), 0x80 | (code & 0x3f));
+        }
+      }
+      return new Uint8Array(bytes);
+    }
+  }
+
+  root.TextEncoder = MiniTextEncoder as unknown as typeof TextEncoder;
+}
+
+installTextEncodingPolyfill();
+
+export {};