fix: upx 负数转换和正数不一致的问题

src/core/service/api/upx2px.js

@@ -16,7 +16,7 @@ export function checkDeviceWidth () {
   isIOS = platform === 'ios'
 }
 
-export function upx2px (number, newDeviceWidth) {
+export function upx2px (number, newDeviceWidth) {
   if (deviceWidth === 0) {
     checkDeviceWidth()
   }
@@ -25,14 +25,17 @@ export function upx2px (number, newDeviceWidth) {
   if (number === 0) {
     return 0
   }
-  number = (number / BASE_DEVICE_WIDTH) * (newDeviceWidth || deviceWidth)
-  number = Math.floor(number + EPS)
-  if (number === 0) {
+  let result = (number / BASE_DEVICE_WIDTH) * (newDeviceWidth || deviceWidth)
+  if (result < 0) {
+    result = -result
+  }
+  result = Math.floor(result + EPS)
+  if (result === 0) {
     if (deviceDPR === 1 || !isIOS) {
       return 1
     } else {
       return 0.5
     }
   }
-  return number
+  return number < 0 ? -result : result
 }