diff --git a/package.json b/package.json
index ee33896..e22c0a9 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
   },
   "homepage": "https://github.com/wxsms/vue-md-loader#readme",
   "devDependencies": {
-    "@babel/preset-env": "7.12.1",
+    "@babel/preset-env": "7.12.7",
     "babel-core": "6.26.3",
     "babel-eslint": "10.1.0",
     "babel-loader": "8.2.1",
diff --git a/yarn.lock b/yarn.lock
index 4a919f9..d68019c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -16,10 +16,10 @@
   dependencies:
     "@babel/highlight" "^7.10.4"
 
-"@babel/compat-data@^7.12.1":
-  version "7.12.1"
-  resolved "https://registry.npm.taobao.org/@babel/compat-data/download/@babel/compat-data-7.12.1.tgz?cache=0&sync_timestamp=1602799793160&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fcompat-data%2Fdownload%2F%40babel%2Fcompat-data-7.12.1.tgz#d7386a689aa0ddf06255005b4b991988021101a0"
-  integrity sha1-1zhqaJqg3fBiVQBbS5kZiAIRAaA=
+"@babel/compat-data@^7.12.5", "@babel/compat-data@^7.12.7":
+  version "7.12.7"
+  resolved "https://registry.npm.taobao.org/@babel/compat-data/download/@babel/compat-data-7.12.7.tgz?cache=0&sync_timestamp=1605906635911&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fcompat-data%2Fdownload%2F%40babel%2Fcompat-data-7.12.7.tgz#9329b4782a7d6bbd7eef57e11addf91ee3ef1e41"
+  integrity sha1-kym0eCp9a71+71fhGt35HuPvHkE=
 
 "@babel/core@^7.7.5":
   version "7.10.2"
@@ -93,14 +93,14 @@
     "@babel/helper-explode-assignable-expression" "^7.10.4"
     "@babel/types" "^7.10.4"
 
-"@babel/helper-compilation-targets@^7.12.1":
-  version "7.12.1"
-  resolved "https://registry.npm.taobao.org/@babel/helper-compilation-targets/download/@babel/helper-compilation-targets-7.12.1.tgz?cache=0&sync_timestamp=1602801865093&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fhelper-compilation-targets%2Fdownload%2F%40babel%2Fhelper-compilation-targets-7.12.1.tgz#310e352888fbdbdd8577be8dfdd2afb9e7adcf50"
-  integrity sha1-MQ41KIj7292Fd76N/dKvueetz1A=
+"@babel/helper-compilation-targets@^7.12.5":
+  version "7.12.5"
+  resolved "https://registry.npm.taobao.org/@babel/helper-compilation-targets/download/@babel/helper-compilation-targets-7.12.5.tgz?cache=0&sync_timestamp=1604441110799&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fhelper-compilation-targets%2Fdownload%2F%40babel%2Fhelper-compilation-targets-7.12.5.tgz#cb470c76198db6a24e9dbc8987275631e5d29831"
+  integrity sha1-y0cMdhmNtqJOnbyJhydWMeXSmDE=
   dependencies:
-    "@babel/compat-data" "^7.12.1"
+    "@babel/compat-data" "^7.12.5"
     "@babel/helper-validator-option" "^7.12.1"
-    browserslist "^4.12.0"
+    browserslist "^4.14.5"
     semver "^5.5.0"
 
 "@babel/helper-create-class-features-plugin@^7.12.1":
@@ -215,6 +215,13 @@
   dependencies:
     "@babel/types" "^7.12.1"
 
+"@babel/helper-module-imports@^7.12.5":
+  version "7.12.5"
+  resolved "https://registry.npm.taobao.org/@babel/helper-module-imports/download/@babel/helper-module-imports-7.12.5.tgz?cache=0&sync_timestamp=1604441111378&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fhelper-module-imports%2Fdownload%2F%40babel%2Fhelper-module-imports-7.12.5.tgz#1bfc0229f794988f76ed0a4d4e90860850b54dfb"
+  integrity sha1-G/wCKfeUmI927QpNTpCGCFC1Tfs=
+  dependencies:
+    "@babel/types" "^7.12.5"
+
 "@babel/helper-module-transforms@^7.10.1":
   version "7.10.1"
   resolved "https://registry.npm.taobao.org/@babel/helper-module-transforms/download/@babel/helper-module-transforms-7.10.1.tgz?cache=0&sync_timestamp=1590617491701&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fhelper-module-transforms%2Fdownload%2F%40babel%2Fhelper-module-transforms-7.10.1.tgz#24e2f08ee6832c60b157bb0936c86bef7210c622"
@@ -470,10 +477,10 @@
     "@babel/helper-plugin-utils" "^7.10.4"
     "@babel/plugin-syntax-nullish-coalescing-operator" "^7.8.0"
 
-"@babel/plugin-proposal-numeric-separator@^7.12.1":
-  version "7.12.1"
-  resolved "https://registry.npm.taobao.org/@babel/plugin-proposal-numeric-separator/download/@babel/plugin-proposal-numeric-separator-7.12.1.tgz?cache=0&sync_timestamp=1602799794912&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fplugin-proposal-numeric-separator%2Fdownload%2F%40babel%2Fplugin-proposal-numeric-separator-7.12.1.tgz#0e2c6774c4ce48be412119b4d693ac777f7685a6"
-  integrity sha1-DixndMTOSL5BIRm01pOsd392haY=
+"@babel/plugin-proposal-numeric-separator@^7.12.7":
+  version "7.12.7"
+  resolved "https://registry.npm.taobao.org/@babel/plugin-proposal-numeric-separator/download/@babel/plugin-proposal-numeric-separator-7.12.7.tgz?cache=0&sync_timestamp=1605904766593&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fplugin-proposal-numeric-separator%2Fdownload%2F%40babel%2Fplugin-proposal-numeric-separator-7.12.7.tgz#8bf253de8139099fea193b297d23a9d406ef056b"
+  integrity sha1-i/JT3oE5CZ/qGTspfSOp1AbvBWs=
   dependencies:
     "@babel/helper-plugin-utils" "^7.10.4"
     "@babel/plugin-syntax-numeric-separator" "^7.10.4"
@@ -495,10 +502,10 @@
     "@babel/helper-plugin-utils" "^7.10.4"
     "@babel/plugin-syntax-optional-catch-binding" "^7.8.0"
 
-"@babel/plugin-proposal-optional-chaining@^7.12.1":
-  version "7.12.1"
-  resolved "https://registry.npm.taobao.org/@babel/plugin-proposal-optional-chaining/download/@babel/plugin-proposal-optional-chaining-7.12.1.tgz?cache=0&sync_timestamp=1602800053237&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fplugin-proposal-optional-chaining%2Fdownload%2F%40babel%2Fplugin-proposal-optional-chaining-7.12.1.tgz#cce122203fc8a32794296fc377c6dedaf4363797"
-  integrity sha1-zOEiID/IoyeUKW/Dd8be2vQ2N5c=
+"@babel/plugin-proposal-optional-chaining@^7.12.7":
+  version "7.12.7"
+  resolved "https://registry.npm.taobao.org/@babel/plugin-proposal-optional-chaining/download/@babel/plugin-proposal-optional-chaining-7.12.7.tgz?cache=0&sync_timestamp=1605904767162&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fplugin-proposal-optional-chaining%2Fdownload%2F%40babel%2Fplugin-proposal-optional-chaining-7.12.7.tgz#e02f0ea1b5dc59d401ec16fb824679f683d3303c"
+  integrity sha1-4C8OobXcWdQB7Bb7gkZ59oPTMDw=
   dependencies:
     "@babel/helper-plugin-utils" "^7.10.4"
     "@babel/helper-skip-transparent-expression-wrappers" "^7.12.1"
@@ -833,13 +840,12 @@
     "@babel/helper-plugin-utils" "^7.10.4"
     "@babel/helper-skip-transparent-expression-wrappers" "^7.12.1"
 
-"@babel/plugin-transform-sticky-regex@^7.12.1":
-  version "7.12.1"
-  resolved "https://registry.npm.taobao.org/@babel/plugin-transform-sticky-regex/download/@babel/plugin-transform-sticky-regex-7.12.1.tgz?cache=0&sync_timestamp=1602800063088&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fplugin-transform-sticky-regex%2Fdownload%2F%40babel%2Fplugin-transform-sticky-regex-7.12.1.tgz#5c24cf50de396d30e99afc8d1c700e8bce0f5caf"
-  integrity sha1-XCTPUN45bTDpmvyNHHAOi84PXK8=
+"@babel/plugin-transform-sticky-regex@^7.12.7":
+  version "7.12.7"
+  resolved "https://registry.npm.taobao.org/@babel/plugin-transform-sticky-regex/download/@babel/plugin-transform-sticky-regex-7.12.7.tgz?cache=0&sync_timestamp=1605904770708&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fplugin-transform-sticky-regex%2Fdownload%2F%40babel%2Fplugin-transform-sticky-regex-7.12.7.tgz#560224613ab23987453948ed21d0b0b193fa7fad"
+  integrity sha1-VgIkYTqyOYdFOUjtIdCwsZP6f60=
   dependencies:
     "@babel/helper-plugin-utils" "^7.10.4"
-    "@babel/helper-regex" "^7.10.4"
 
 "@babel/plugin-transform-template-literals@^7.12.1":
   version "7.12.1"
@@ -870,14 +876,14 @@
     "@babel/helper-create-regexp-features-plugin" "^7.12.1"
     "@babel/helper-plugin-utils" "^7.10.4"
 
-"@babel/preset-env@7.12.1":
-  version "7.12.1"
-  resolved "https://registry.npm.taobao.org/@babel/preset-env/download/@babel/preset-env-7.12.1.tgz?cache=0&sync_timestamp=1602800041590&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fpreset-env%2Fdownload%2F%40babel%2Fpreset-env-7.12.1.tgz#9c7e5ca82a19efc865384bb4989148d2ee5d7ac2"
-  integrity sha1-nH5cqCoZ78hlOEu0mJFI0u5desI=
+"@babel/preset-env@7.12.7":
+  version "7.12.7"
+  resolved "https://registry.npm.taobao.org/@babel/preset-env/download/@babel/preset-env-7.12.7.tgz?cache=0&sync_timestamp=1605904754740&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Fpreset-env%2Fdownload%2F%40babel%2Fpreset-env-7.12.7.tgz#54ea21dbe92caf6f10cb1a0a576adc4ebf094b55"
+  integrity sha1-VOoh2+ksr28QyxoKV2rcTr8JS1U=
   dependencies:
-    "@babel/compat-data" "^7.12.1"
-    "@babel/helper-compilation-targets" "^7.12.1"
-    "@babel/helper-module-imports" "^7.12.1"
+    "@babel/compat-data" "^7.12.7"
+    "@babel/helper-compilation-targets" "^7.12.5"
+    "@babel/helper-module-imports" "^7.12.5"
     "@babel/helper-plugin-utils" "^7.10.4"
     "@babel/helper-validator-option" "^7.12.1"
     "@babel/plugin-proposal-async-generator-functions" "^7.12.1"
@@ -887,10 +893,10 @@
     "@babel/plugin-proposal-json-strings" "^7.12.1"
     "@babel/plugin-proposal-logical-assignment-operators" "^7.12.1"
     "@babel/plugin-proposal-nullish-coalescing-operator" "^7.12.1"
-    "@babel/plugin-proposal-numeric-separator" "^7.12.1"
+    "@babel/plugin-proposal-numeric-separator" "^7.12.7"
     "@babel/plugin-proposal-object-rest-spread" "^7.12.1"
     "@babel/plugin-proposal-optional-catch-binding" "^7.12.1"
-    "@babel/plugin-proposal-optional-chaining" "^7.12.1"
+    "@babel/plugin-proposal-optional-chaining" "^7.12.7"
     "@babel/plugin-proposal-private-methods" "^7.12.1"
     "@babel/plugin-proposal-unicode-property-regex" "^7.12.1"
     "@babel/plugin-syntax-async-generators" "^7.8.0"
@@ -932,14 +938,14 @@
     "@babel/plugin-transform-reserved-words" "^7.12.1"
     "@babel/plugin-transform-shorthand-properties" "^7.12.1"
     "@babel/plugin-transform-spread" "^7.12.1"
-    "@babel/plugin-transform-sticky-regex" "^7.12.1"
+    "@babel/plugin-transform-sticky-regex" "^7.12.7"
     "@babel/plugin-transform-template-literals" "^7.12.1"
     "@babel/plugin-transform-typeof-symbol" "^7.12.1"
     "@babel/plugin-transform-unicode-escapes" "^7.12.1"
     "@babel/plugin-transform-unicode-regex" "^7.12.1"
     "@babel/preset-modules" "^0.1.3"
-    "@babel/types" "^7.12.1"
-    core-js-compat "^3.6.2"
+    "@babel/types" "^7.12.7"
+    core-js-compat "^3.7.0"
     semver "^5.5.0"
 
 "@babel/preset-modules@^0.1.3":
@@ -1050,6 +1056,15 @@
     lodash "^4.17.19"
     to-fast-properties "^2.0.0"
 
+"@babel/types@^7.12.5", "@babel/types@^7.12.7":
+  version "7.12.7"
+  resolved "https://registry.npm.taobao.org/@babel/types/download/@babel/types-7.12.7.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40babel%2Ftypes%2Fdownload%2F%40babel%2Ftypes-7.12.7.tgz#6039ff1e242640a29452c9ae572162ec9a8f5d13"
+  integrity sha1-YDn/HiQmQKKUUsmuVyFi7JqPXRM=
+  dependencies:
+    "@babel/helper-validator-identifier" "^7.10.4"
+    lodash "^4.17.19"
+    to-fast-properties "^2.0.0"
+
 "@eslint/eslintrc@^0.2.1":
   version "0.2.1"
   resolved "https://registry.npm.taobao.org/@eslint/eslintrc/download/@eslint/eslintrc-0.2.1.tgz?cache=0&sync_timestamp=1603768465230&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2F%40eslint%2Feslintrc%2Fdownload%2F%40eslint%2Feslintrc-0.2.1.tgz#f72069c330461a06684d119384435e12a5d76e3c"
@@ -1986,15 +2001,16 @@ browserify-zlib@^0.2.0:
   dependencies:
     pako "~1.0.5"
 
-browserslist@^4.12.0, browserslist@^4.8.5:
-  version "4.12.0"
-  resolved "https://registry.npm.taobao.org/browserslist/download/browserslist-4.12.0.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fbrowserslist%2Fdownload%2Fbrowserslist-4.12.0.tgz#06c6d5715a1ede6c51fc39ff67fd647f740b656d"
-  integrity sha1-BsbVcVoe3mxR/Dn/Z/1kf3QLZW0=
+browserslist@^4.14.5, browserslist@^4.14.6:
+  version "4.14.7"
+  resolved "https://registry.npm.taobao.org/browserslist/download/browserslist-4.14.7.tgz?cache=0&sync_timestamp=1604945400038&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fbrowserslist%2Fdownload%2Fbrowserslist-4.14.7.tgz#c071c1b3622c1c2e790799a37bb09473a4351cb6"
+  integrity sha1-wHHBs2IsHC55B5mje7CUc6Q1HLY=
   dependencies:
-    caniuse-lite "^1.0.30001043"
-    electron-to-chromium "^1.3.413"
-    node-releases "^1.1.53"
-    pkg-up "^2.0.0"
+    caniuse-lite "^1.0.30001157"
+    colorette "^1.2.1"
+    electron-to-chromium "^1.3.591"
+    escalade "^3.1.1"
+    node-releases "^1.1.66"
 
 buffer-from@^1.0.0:
   version "1.1.1"
@@ -2101,10 +2117,10 @@ camelcase@^6.2.0:
   resolved "https://registry.npm.taobao.org/camelcase/download/camelcase-6.2.0.tgz?cache=0&sync_timestamp=1603922099064&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fcamelcase%2Fdownload%2Fcamelcase-6.2.0.tgz#924af881c9d525ac9d87f40d964e5cea982a1809"
   integrity sha1-kkr4gcnVJaydh/QNlk5c6pgqGAk=
 
-caniuse-lite@^1.0.30001043:
-  version "1.0.30001079"
-  resolved "https://registry.npm.taobao.org/caniuse-lite/download/caniuse-lite-1.0.30001079.tgz?cache=0&sync_timestamp=1591596408506&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fcaniuse-lite%2Fdownload%2Fcaniuse-lite-1.0.30001079.tgz#ed3e5225cd9a6850984fdd88bf24ce45d69b9c22"
-  integrity sha1-7T5SJc2aaFCYT92IvyTORdabnCI=
+caniuse-lite@^1.0.30001157:
+  version "1.0.30001159"
+  resolved "https://registry.npm.taobao.org/caniuse-lite/download/caniuse-lite-1.0.30001159.tgz?cache=0&sync_timestamp=1605683364768&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fcaniuse-lite%2Fdownload%2Fcaniuse-lite-1.0.30001159.tgz#bebde28f893fa9594dadcaa7d6b8e2aa0299df20"
+  integrity sha1-vr3ij4k/qVlNrcqn1rjiqgKZ3yA=
 
 caseless@~0.12.0:
   version "0.12.0"
@@ -2452,12 +2468,12 @@ copy-descriptor@^0.1.0:
   resolved "https://registry.npm.taobao.org/copy-descriptor/download/copy-descriptor-0.1.1.tgz#676f6eb3c39997c2ee1ac3a924fd6124748f578d"
   integrity sha1-Z29us8OZl8LuGsOpJP1hJHSPV40=
 
-core-js-compat@^3.6.2:
-  version "3.6.5"
-  resolved "https://registry.npm.taobao.org/core-js-compat/download/core-js-compat-3.6.5.tgz#2a51d9a4e25dfd6e690251aa81f99e3c05481f1c"
-  integrity sha1-KlHZpOJd/W5pAlGqgfmePAVIHxw=
+core-js-compat@^3.7.0:
+  version "3.7.0"
+  resolved "https://registry.npm.taobao.org/core-js-compat/download/core-js-compat-3.7.0.tgz#8479c5d3d672d83f1f5ab94cf353e57113e065ed"
+  integrity sha1-hHnF09Zy2D8fWrlM81PlcRPgZe0=
   dependencies:
-    browserslist "^4.8.5"
+    browserslist "^4.14.6"
     semver "7.0.0"
 
 core-js@^2.4.0, core-js@^2.5.0:
@@ -2933,10 +2949,10 @@ ee-first@1.1.1:
   resolved "https://registry.npm.taobao.org/ee-first/download/ee-first-1.1.1.tgz#590c61156b0ae2f4f0255732a158b266bc56b21d"
   integrity sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0=
 
-electron-to-chromium@^1.3.413:
-  version "1.3.465"
-  resolved "https://registry.npm.taobao.org/electron-to-chromium/download/electron-to-chromium-1.3.465.tgz?cache=0&sync_timestamp=1591645196932&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Felectron-to-chromium%2Fdownload%2Felectron-to-chromium-1.3.465.tgz#d692e5c383317570c2bd82092a24a0308c6ccf29"
-  integrity sha1-1pLlw4MxdXDCvYIJKiSgMIxszyk=
+electron-to-chromium@^1.3.591:
+  version "1.3.603"
+  resolved "https://registry.npm.taobao.org/electron-to-chromium/download/electron-to-chromium-1.3.603.tgz?cache=0&sync_timestamp=1605839617509&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Felectron-to-chromium%2Fdownload%2Felectron-to-chromium-1.3.603.tgz#1b71bec27fb940eccd79245f6824c63d5f7e8abf"
+  integrity sha1-G3G+wn+5QOzNeSRfaCTGPV9+ir8=
 
 elliptic@^6.0.0, elliptic@^6.5.2:
   version "6.5.3"
@@ -3054,6 +3070,11 @@ es6-error@^4.0.1:
   resolved "https://registry.npm.taobao.org/es6-error/download/es6-error-4.1.1.tgz#9e3af407459deed47e9a91f9b885a84eb05c561d"
   integrity sha1-njr0B0Wd7tR+mpH5uIWoTrBcVh0=
 
+escalade@^3.1.1:
+  version "3.1.1"
+  resolved "https://registry.npm.taobao.org/escalade/download/escalade-3.1.1.tgz?cache=0&sync_timestamp=1602567306925&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fescalade%2Fdownload%2Fescalade-3.1.1.tgz#d8cfdc7000965c5a0174b4a82eaa5c0552742e40"
+  integrity sha1-2M/ccACWXFoBdLSoLqpcBVJ0LkA=
+
 escape-html@~1.0.3:
   version "1.0.3"
   resolved "https://registry.npm.taobao.org/escape-html/download/escape-html-1.0.3.tgz#0258eae4d3d0c0974de1c169188ef0051d1d1988"
@@ -5220,10 +5241,10 @@ node-preload@^0.2.1:
   dependencies:
     process-on-spawn "^1.0.0"
 
-node-releases@^1.1.53:
-  version "1.1.58"
-  resolved "https://registry.npm.taobao.org/node-releases/download/node-releases-1.1.58.tgz#8ee20eef30fa60e52755fcc0942def5a734fe935"
-  integrity sha1-juIO7zD6YOUnVfzAlC3vWnNP6TU=
+node-releases@^1.1.66:
+  version "1.1.67"
+  resolved "https://registry.npm.taobao.org/node-releases/download/node-releases-1.1.67.tgz?cache=0&sync_timestamp=1605581386961&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fnode-releases%2Fdownload%2Fnode-releases-1.1.67.tgz#28ebfcccd0baa6aad8e8d4d8fe4cbc49ae239c12"
+  integrity sha1-KOv8zNC6pqrY6NTY/ky8Sa4jnBI=
 
 normalize-package-data@^2.3.2:
   version "2.5.0"
@@ -5725,13 +5746,6 @@ pkg-dir@^4.1.0, pkg-dir@^4.2.0:
   dependencies:
     find-up "^4.0.0"
 
-pkg-up@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.npm.taobao.org/pkg-up/download/pkg-up-2.0.0.tgz#c819ac728059a461cab1c3889a2be3c49a004d7f"
-  integrity sha1-yBmscoBZpGHKscOImivjxJoATX8=
-  dependencies:
-    find-up "^2.1.0"
-
 portfinder@^1.0.26:
   version "1.0.26"
   resolved "https://registry.npm.taobao.org/portfinder/download/portfinder-1.0.26.tgz#475658d56ca30bed72ac7f1378ed350bd1b64e70"