diff --git a/index.js b/index.js
index e842d44..b65e63f 100644
--- a/index.js
+++ b/index.js
@@ -48,15 +48,24 @@ module.exports = {
     console.log('👇 < BackendRequest > ', { apiWho, apiHow, apiWhat }, ' < /BackendRequest > 👇')
     let result = {}
     if (backend === 'CLOUD') {
-      let { success, header, requestedId, result: resultCloud = {} } = await uniCloud.callFunction({
-        name: apiWho,
-        data: {
-          apiHow,
-          apiWhat,
-          _passtoken: uni.getStorageSync('_passtoken'),
-          // uniIdToken // uniCloud自动getStorageSync('uni_id_token')并传递为 uniIdToken；也可自行传入 uniIdToken
-        },
-      })
+      let { /* success, header, requestedId, */ result: resultCloud = {} } = await uniCloud
+        .callFunction({
+          name: apiWho,
+          data: {
+            apiHow,
+            apiWhat,
+            _passtoken: uni.getStorageSync('_passtoken'),
+            // uniIdToken // uniCloud自动getStorageSync('uni_id_token')并传递为 uniIdToken；也可自行传入 uniIdToken
+          },
+        })
+        .catch((exp) => {
+          // 断网或云端返回异常 {errMsg, stack} = error
+          if (/request:fail/.test(exp.errMsg)) {
+            return { result: { _state: 'CLIENT_BACKEND_BROKEN' } }
+          }else {
+            return { result: { _state: 'CLIENT_BACKEND_EXCEPTION' }}
+          }
+        })
       result = resultCloud
     } else {
       if (method === 'GET') {
@@ -71,7 +80,19 @@ module.exports = {
         header: { _passtoken: uni.getStorageSync('_passtoken') },
         data: apiWhat,
       })
-      result = resultServer
+      if (error) {
+        if (error.errMsg === 'request:fail') {
+          // 后台断线
+          result = { _state: 'CLIENT_BACKEND_BROKEN' }
+        } else (error.errMsg==='request:fail timeout') {
+          // 后台异常而超时返回
+          result = { _state: 'CLIENT_BACKEND_TIMEOUT' }
+        }else{
+          result = { _state: 'CLIENT_BACKEND_EXCEPTION' }
+        }
+      } else {
+        result = resultServer
+      }
     }
     console.log('👆 < BackendResult > ️', result, '< /BackendResult > 👆')
     return result
@@ -290,11 +311,11 @@ module.exports = {
   },
 
   formatMoney(value, decimal) {
-    return Number(value).toFixed(decimal || 2)
+    return Number(value || 0).toFixed(decimal || 2) // Number(undefined)===NaN
   },
 
   formatPercent(value, decimal) {
-    return `${Number(value * 100).toFixed(decimal || 2)}`
+    return Number(value * 100 || 0).toFixed(decimal || 2)
   },
 
   formatDate(date, format) {