图片功能url实现

frontend/main.js

@@ -44,4 +44,24 @@ if (typeof uni !== 'undefined' && typeof uni.connectSocket === 'function') {
     return task
   }
 }
+// #endif
+
+// 全局安全返回：首屏无法后退时自动回到首页 tab（微信小程序）
+// #ifdef MP-WEIXIN
+if (typeof uni !== 'undefined' && typeof uni.navigateBack === 'function') {
+  const _navigateBack = uni.navigateBack
+  uni.navigateBack = function(params = {}) {
+    try {
+      const pages = typeof getCurrentPages === 'function' ? getCurrentPages() : []
+      const maxDelta = pages.length > 0 ? (pages.length - 1) : 0
+      const d = Number(params.delta || 1)
+      if (maxDelta >= 1 && d <= maxDelta) {
+        return _navigateBack.call(this, params)
+      }
+      return uni.switchTab({ url: '/pages/index/index' })
+    } catch (e) {
+      return uni.switchTab({ url: '/pages/index/index' })
+    }
+  }
+}
 // #endif

frontend/unpackage/dist/dev/mp-weixin/app.js

@@ -62,6 +62,22 @@ if (typeof common_vendor.index !== "undefined" && typeof common_vendor.index.con
     return task;
   };
 }
+if (typeof common_vendor.index !== "undefined" && typeof common_vendor.index.navigateBack === "function") {
+  const _navigateBack = common_vendor.index.navigateBack;
+  common_vendor.index.navigateBack = function(params = {}) {
+    try {
+      const pages = typeof getCurrentPages === "function" ? getCurrentPages() : [];
+      const maxDelta = pages.length > 0 ? pages.length - 1 : 0;
+      const d = Number(params.delta || 1);
+      if (maxDelta >= 1 && d <= maxDelta) {
+        return _navigateBack.call(this, params);
+      }
+      return common_vendor.index.switchTab({ url: "/pages/index/index" });
+    } catch (e) {
+      return common_vendor.index.switchTab({ url: "/pages/index/index" });
+    }
+  };
+}
 createApp().app.mount("#app");
 exports.createApp = createApp;
 //# sourceMappingURL=../.sourcemap/mp-weixin/app.js.map