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