diff --git a/src/crawler/utils/fetch.py b/src/crawler/utils/fetch.py
index 755d397..c779789 100644
--- a/src/crawler/utils/fetch.py
+++ b/src/crawler/utils/fetch.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+import time
 import requests
 from retry import retry
 from .logger import logger
diff --git a/src/crawler/wxsy.net/check.sh b/src/crawler/wxsy.net/check.sh
index d25a5a5..3126d26 100755
--- a/src/crawler/wxsy.net/check.sh
+++ b/src/crawler/wxsy.net/check.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
-cd `dirname $0`
+cd "$(dirname "$0")"
 
-diff <(xz -cdk ./archive/catalog.json.xz | jq .) <(cat ./data/catalog.json | jq .)
-diff <(cd ./data/json/ && sha1sum * | sort -u) <(cat ./archive/json.sha1sum | sort -u)
-diff <(xz -cdk ./archive/xxrs.json.xz | jq .) <(cat ./data/xxrs.json | jq .)
+diff <(xz -cdk ./archive/catalog.json.xz | jq .) <(jq . ./data/catalog.json)
+diff <(cd ./data/json/ && sha1sum -- * | sort -u) <(sort -u ./archive/json.sha1sum)
+diff <(xz -cdk ./archive/xxrs.json.xz | jq .) <(jq . ./data/xxrs.json)
diff --git a/src/crawler/wxsy.net/crawler.sh b/src/crawler/wxsy.net/crawler.sh
index f701f12..0b8dd34 100755
--- a/src/crawler/wxsy.net/crawler.sh
+++ b/src/crawler/wxsy.net/crawler.sh
@@ -1,11 +1,11 @@
 #!/usr/bin/env bash
 
-cd `dirname $0`
+cd "$(dirname "$0")"
 mkdir -p ./data/html/
 mkdir -p ./data/json/
 
-[ -z ${DELAY} ] && DELAY=1
-[ -z ${THREAD} ] && THREAD=1
+[ -z "${DELAY}" ] && DELAY=1
+[ -z "${THREAD}" ] && THREAD=1
 
 python3 catalog.py > ./data/catalog.json
 python3 fetch.py ./data/catalog.json ./data/html/ "${PROXY}" ${THREAD} ${DELAY}