diff --git a/package.json b/package.json
index 109cf67..ee5db27 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "enquire.js": "^2.1.6",
     "mockjs": "^1.0.1-beta3",
     "moment": "^2.22.2",
+    "pouchdb": "^7.0.0",
     "viser-vue": "^2.2.5",
     "vue": "^2.5.17",
     "vue-router": "^3.0.1",
diff --git a/yarn.lock b/yarn.lock
index 3977bfe..e421faa 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -228,6 +228,18 @@ abs-svg-path@~0.1.1:
   version "0.1.1"
   resolved "http://registry.npm.taobao.org/abs-svg-path/download/abs-svg-path-0.1.1.tgz#df601c8e8d2ba10d4a76d625e236a9a39c2723bf"
 
+abstract-leveldown@^4.0.0, abstract-leveldown@~4.0.0:
+  version "4.0.3"
+  resolved "http://registry.npm.taobao.org/abstract-leveldown/download/abstract-leveldown-4.0.3.tgz#cb636f4965fbe117f5c8b76a7d51dd42aaed0580"
+  dependencies:
+    xtend "~4.0.0"
+
+abstract-leveldown@~5.0.0:
+  version "5.0.0"
+  resolved "http://registry.npm.taobao.org/abstract-leveldown/download/abstract-leveldown-5.0.0.tgz#f7128e1f86ccabf7d2893077ce5d06d798e386c6"
+  dependencies:
+    xtend "~4.0.0"
+
 accepts@~1.3.4, accepts@~1.3.5:
   version "1.3.5"
   resolved "http://registry.npm.taobao.org/accepts/download/accepts-1.3.5.tgz#eb777df6011723a3b14e8a72c0805c8e86746bd2"
@@ -401,6 +413,10 @@ argparse@^1.0.7:
   dependencies:
     sprintf-js "~1.0.2"
 
+argsarray@0.0.1:
+  version "0.0.1"
+  resolved "http://registry.npm.taobao.org/argsarray/download/argsarray-0.0.1.tgz#6e7207b4ecdb39b0af88303fa5ae22bda8df61cb"
+
 arr-diff@^2.0.0:
   version "2.0.0"
   resolved "http://registry.npm.taobao.org/arr-diff/download/arr-diff-2.0.0.tgz#8f3b827f955a8bd669697e4a4256ac3ceae356cf"
@@ -1309,6 +1325,17 @@ binary-extensions@^1.0.0:
   version "1.11.0"
   resolved "http://registry.npm.taobao.org/binary-extensions/download/binary-extensions-1.11.0.tgz#46aa1751fb6a2f93ee5e689bb1087d4b14c6c205"
 
+bindings@~1.3.0:
+  version "1.3.0"
+  resolved "http://registry.npm.taobao.org/bindings/download/bindings-1.3.0.tgz#b346f6ecf6a95f5a815c5839fc7cdb22502f1ed7"
+
+bl@^1.0.0:
+  version "1.2.2"
+  resolved "http://registry.npm.taobao.org/bl/download/bl-1.2.2.tgz#a160911717103c07410cef63ef51b397c025af9c"
+  dependencies:
+    readable-stream "^2.3.5"
+    safe-buffer "^5.1.1"
+
 bluebird@^3.0.5, bluebird@^3.1.1, bluebird@^3.4.7, bluebird@^3.5.1:
   version "3.5.1"
   resolved "http://registry.npm.taobao.org/bluebird/download/bluebird-3.5.1.tgz#d9551f9de98f1fcda1e683d17ee91a0602ee2eb9"
@@ -1475,7 +1502,22 @@ bser@^2.0.0:
   dependencies:
     node-int64 "^0.4.0"
 
-buffer-from@^1.0.0:
+buffer-alloc-unsafe@^1.1.0:
+  version "1.1.0"
+  resolved "http://registry.npm.taobao.org/buffer-alloc-unsafe/download/buffer-alloc-unsafe-1.1.0.tgz#bd7dc26ae2972d0eda253be061dba992349c19f0"
+
+buffer-alloc@^1.1.0:
+  version "1.2.0"
+  resolved "http://registry.npm.taobao.org/buffer-alloc/download/buffer-alloc-1.2.0.tgz#890dd90d923a873e08e10e5fd51a57e5b7cce0ec"
+  dependencies:
+    buffer-alloc-unsafe "^1.1.0"
+    buffer-fill "^1.0.0"
+
+buffer-fill@^1.0.0:
+  version "1.0.0"
+  resolved "http://registry.npm.taobao.org/buffer-fill/download/buffer-fill-1.0.0.tgz#f8f78b76789888ef39f205cd637f68e702122b2c"
+
+buffer-from@1.1.0, buffer-from@^1.0.0:
   version "1.1.0"
   resolved "http://registry.npm.taobao.org/buffer-from/download/buffer-from-1.1.0.tgz#87fcaa3a298358e0ade6e442cfce840740d1ad04"
 
@@ -1761,6 +1803,10 @@ cliui@^4.0.0:
     strip-ansi "^4.0.0"
     wrap-ansi "^2.0.0"
 
+clone-buffer@1.0.0:
+  version "1.0.0"
+  resolved "http://registry.npm.taobao.org/clone-buffer/download/clone-buffer-1.0.0.tgz#e3e25b207ac4e701af721e2cb5a16792cac3dc58"
+
 clone@2.x, clone@^2.1.1:
   version "2.1.1"
   resolved "http://registry.npm.taobao.org/clone/download/clone-2.1.1.tgz#d217d1e961118e3ac9a4b8bba3285553bf647cdb"
@@ -2396,6 +2442,12 @@ decode-uri-component@^0.2.0:
   version "0.2.0"
   resolved "http://registry.npm.taobao.org/decode-uri-component/download/decode-uri-component-0.2.0.tgz#eb3913333458775cb84cd1a1fae062106bb87545"
 
+decompress-response@^3.3.0:
+  version "3.3.0"
+  resolved "http://registry.npm.taobao.org/decompress-response/download/decompress-response-3.3.0.tgz#80a4dd323748384bfa248083622aedec982adff3"
+  dependencies:
+    mimic-response "^1.0.0"
+
 deep-eql@0.1.3:
   version "0.1.3"
   resolved "http://registry.npm.taobao.org/deep-eql/download/deep-eql-0.1.3.tgz#ef558acab8de25206cd713906d74e56930eb69f2"
@@ -2420,6 +2472,19 @@ default-require-extensions@^2.0.0:
   dependencies:
     strip-bom "^3.0.0"
 
+deferred-leveldown@~3.0.0:
+  version "3.0.0"
+  resolved "http://registry.npm.taobao.org/deferred-leveldown/download/deferred-leveldown-3.0.0.tgz#bff7241bf156aa3635f520bedf34330c408d3307"
+  dependencies:
+    abstract-leveldown "~4.0.0"
+
+deferred-leveldown@~4.0.0:
+  version "4.0.2"
+  resolved "http://registry.npm.taobao.org/deferred-leveldown/download/deferred-leveldown-4.0.2.tgz#0b0570087827bf480a23494b398f04c128c19a20"
+  dependencies:
+    abstract-leveldown "~5.0.0"
+    inherits "^2.0.3"
+
 define-properties@^1.1.2:
   version "1.1.2"
   resolved "http://registry.npm.taobao.org/define-properties/download/define-properties-1.1.2.tgz#83a73f2fea569898fb737193c8f873caf6d45c94"
@@ -2514,7 +2579,7 @@ detect-indent@^4.0.0:
   dependencies:
     repeating "^2.0.0"
 
-detect-libc@^1.0.2:
+detect-libc@^1.0.2, detect-libc@^1.0.3:
   version "1.0.3"
   resolved "http://registry.npm.taobao.org/detect-libc/download/detect-libc-1.0.3.tgz#fa137c4bd698edf55cd5cd02ac559f91a4c4ba9b"
 
@@ -2647,6 +2712,10 @@ domutils@1.5.1:
     dom-serializer "0"
     domelementtype "1"
 
+double-ended-queue@2.1.0-0:
+  version "2.1.0-0"
+  resolved "http://registry.npm.taobao.org/double-ended-queue/download/double-ended-queue-2.1.0-0.tgz#103d3527fd31528f40188130c841efdd78264e5c"
+
 duplexer@^0.1.1:
   version "0.1.1"
   resolved "http://registry.npm.taobao.org/duplexer/download/duplexer-0.1.1.tgz#ace6ff808c1ce66b57d1ebf97977acb02334cfc1"
@@ -2712,12 +2781,27 @@ encodeurl@~1.0.2:
   version "1.0.2"
   resolved "http://registry.npm.taobao.org/encodeurl/download/encodeurl-1.0.2.tgz#ad3ff4c86ec2d029322f5a02c3a9a606c95b3f59"
 
+encoding-down@~4.0.0:
+  version "4.0.1"
+  resolved "http://registry.npm.taobao.org/encoding-down/download/encoding-down-4.0.1.tgz#15a544eb13d7feeabc9e6f433633d6c966f077c9"
+  dependencies:
+    abstract-leveldown "^4.0.0"
+    level-codec "^8.0.0"
+    level-errors "^1.0.4"
+    xtend "^4.0.1"
+
 end-of-stream@^1.0.0, end-of-stream@^1.1.0:
   version "1.4.1"
   resolved "http://registry.npm.taobao.org/end-of-stream/download/end-of-stream-1.4.1.tgz#ed29634d19baba463b6ce6b80a37213eab71ec43"
   dependencies:
     once "^1.4.0"
 
+end-stream@~0.1.0:
+  version "0.1.0"
+  resolved "http://registry.npm.taobao.org/end-stream/download/end-stream-0.1.0.tgz#32003f3f438a2b0143168137f8fa6e9866c81ed5"
+  dependencies:
+    write-stream "~0.4.3"
+
 enhanced-resolve@^3.4.0:
   version "3.4.1"
   resolved "http://registry.npm.taobao.org/enhanced-resolve/download/enhanced-resolve-3.4.1.tgz#0421e339fd71419b3da13d129b3979040230476e"
@@ -2735,7 +2819,7 @@ entities@~1.1.1:
   version "1.1.1"
   resolved "http://registry.npm.taobao.org/entities/download/entities-1.1.1.tgz#6e5c2d0a5621b5dadaecef80b90edfb5cd7772f0"
 
-errno@^0.1.1, errno@^0.1.3, errno@~0.1.7:
+errno@^0.1.1, errno@^0.1.3, errno@~0.1.1, errno@~0.1.7:
   version "0.1.7"
   resolved "http://registry.npm.taobao.org/errno/download/errno-0.1.7.tgz#4684d71779ad39af177e3f007996f7c67c852618"
   dependencies:
@@ -2779,6 +2863,10 @@ es5-ext@^0.10.14, es5-ext@^0.10.35, es5-ext@^0.10.9, es5-ext@~0.10.14:
     es6-symbol "~3.1.1"
     next-tick "1"
 
+es6-denodeify@^0.1.1:
+  version "0.1.5"
+  resolved "http://registry.npm.taobao.org/es6-denodeify/download/es6-denodeify-0.1.5.tgz#31d4d5fe9c5503e125460439310e16a2a3f39c1f"
+
 es6-iterator@^2.0.1, es6-iterator@~2.0.1, es6-iterator@~2.0.3:
   version "2.0.3"
   resolved "http://registry.npm.taobao.org/es6-iterator/download/es6-iterator-2.0.3.tgz#a7de889141a05a94b0854403b2d0a0fbfa98f3b7"
@@ -3106,6 +3194,10 @@ expand-range@^1.8.1:
   dependencies:
     fill-range "^2.1.0"
 
+expand-template@^1.0.2:
+  version "1.1.1"
+  resolved "http://registry.npm.taobao.org/expand-template/download/expand-template-1.1.1.tgz#981f188c0c3a87d2e28f559bc541426ff94f21dd"
+
 expect@^22.4.0:
   version "22.4.3"
   resolved "http://registry.npm.taobao.org/expect/download/expect-22.4.3.tgz#d5a29d0a0e1fb2153557caef2674d4547e914674"
@@ -3230,6 +3322,10 @@ fast-deep-equal@^2.0.1:
   version "2.0.1"
   resolved "http://registry.npm.taobao.org/fast-deep-equal/download/fast-deep-equal-2.0.1.tgz#7b05218ddf9667bf7f370bf7fdb2cb15fdd0aa49"
 
+fast-future@~1.0.2:
+  version "1.0.2"
+  resolved "http://registry.npm.taobao.org/fast-future/download/fast-future-1.0.2.tgz#8435a9aaa02d79248d17d704e76259301d99280a"
+
 fast-json-stable-stringify@^2.0.0:
   version "2.0.0"
   resolved "http://registry.npm.taobao.org/fast-json-stable-stringify/download/fast-json-stable-stringify-2.0.0.tgz#d5142c0caee6b1189f87d3a76111064f86c8bbf2"
@@ -3270,6 +3366,13 @@ fecha@~2.3.3:
   version "2.3.3"
   resolved "http://registry.npm.taobao.org/fecha/download/fecha-2.3.3.tgz#948e74157df1a32fd1b12c3a3c3cdcb6ec9d96cd"
 
+fetch-cookie@0.7.0:
+  version "0.7.0"
+  resolved "http://registry.npm.taobao.org/fetch-cookie/download/fetch-cookie-0.7.0.tgz#a6fc137ad8363aa89125864c6451b86ecb7de802"
+  dependencies:
+    es6-denodeify "^0.1.1"
+    tough-cookie "^2.3.1"
+
 figures@^2.0.0:
   version "2.0.0"
   resolved "http://registry.npm.taobao.org/figures/download/figures-2.0.0.tgz#3ab1a2d2a62c8bfb431a0c94cb797a2fce27c962"
@@ -3473,6 +3576,10 @@ from2@^2.1.0:
     inherits "^2.0.1"
     readable-stream "^2.0.0"
 
+fs-constants@^1.0.0:
+  version "1.0.0"
+  resolved "http://registry.npm.taobao.org/fs-constants/download/fs-constants-1.0.0.tgz#6be0de9be998ce16af8afc24497b9ee9b7ccd9ad"
+
 fs-minipass@^1.2.5:
   version "1.2.5"
   resolved "http://registry.npm.taobao.org/fs-minipass/download/fs-minipass-1.2.5.tgz#06c277218454ec288df77ada54a03b8702aacb9d"
@@ -3560,6 +3667,10 @@ getpass@^0.1.1:
   dependencies:
     assert-plus "^1.0.0"
 
+github-from-package@0.0.0:
+  version "0.0.0"
+  resolved "http://registry.npm.taobao.org/github-from-package/download/github-from-package-0.0.0.tgz#97fb5d96bfde8973313f20e8288ef9a167fa64ce"
+
 gl-matrix@~2.6.1:
   version "2.6.1"
   resolved "http://registry.npm.taobao.org/gl-matrix/download/gl-matrix-2.6.1.tgz#1bc7f7b396f4ae80abdb4db9a98cd07d170b9004"
@@ -3968,6 +4079,10 @@ image-size@~0.5.0:
   version "0.5.5"
   resolved "http://registry.npm.taobao.org/image-size/download/image-size-0.5.5.tgz#09dfd4ab9d20e29eb1c3e80b8990378df9e3cb9c"
 
+immediate@3.0.6:
+  version "3.0.6"
+  resolved "http://registry.npm.taobao.org/immediate/download/immediate-3.0.6.tgz#9db1dbd0faf8de6fbe0f5dd5e56bb606280de69b"
+
 import-cwd@^2.0.0:
   version "2.1.0"
   resolved "http://registry.npm.taobao.org/import-cwd/download/import-cwd-2.1.0.tgz#aa6cf36e722761285cb371ec6519f53e2435b0a9"
@@ -4909,6 +5024,93 @@ less@^3.7.1:
     request "^2.83.0"
     source-map "~0.6.0"
 
+level-codec@7.0.1:
+  version "7.0.1"
+  resolved "http://registry.npm.taobao.org/level-codec/download/level-codec-7.0.1.tgz#341f22f907ce0f16763f24bddd681e395a0fb8a7"
+
+level-codec@^8.0.0:
+  version "8.0.0"
+  resolved "http://registry.npm.taobao.org/level-codec/download/level-codec-8.0.0.tgz#3a4a0de06dae20c2f5a57b3372c7651e67083e03"
+
+level-errors@^1.0.4, level-errors@~1.1.0:
+  version "1.1.2"
+  resolved "http://registry.npm.taobao.org/level-errors/download/level-errors-1.1.2.tgz#4399c2f3d3ab87d0625f7e3676e2d807deff404d"
+  dependencies:
+    errno "~0.1.1"
+
+level-errors@~2.0.0:
+  version "2.0.0"
+  resolved "http://registry.npm.taobao.org/level-errors/download/level-errors-2.0.0.tgz#2de5b566b62eef92f99e19be74397fbc512563fa"
+  dependencies:
+    errno "~0.1.1"
+
+level-iterator-stream@~2.0.0:
+  version "2.0.3"
+  resolved "http://registry.npm.taobao.org/level-iterator-stream/download/level-iterator-stream-2.0.3.tgz#ccfff7c046dcf47955ae9a86f46dfa06a31688b4"
+  dependencies:
+    inherits "^2.0.1"
+    readable-stream "^2.0.5"
+    xtend "^4.0.0"
+
+level-packager@^2.0.2:
+  version "2.1.1"
+  resolved "http://registry.npm.taobao.org/level-packager/download/level-packager-2.1.1.tgz#10b653decb67b0a09c4e961ae84f196edaad205a"
+  dependencies:
+    encoding-down "~4.0.0"
+    levelup "^2.0.0"
+
+level-write-stream@1.0.0:
+  version "1.0.0"
+  resolved "http://registry.npm.taobao.org/level-write-stream/download/level-write-stream-1.0.0.tgz#3f7fbb679a55137c0feb303dee766e12ee13c1dc"
+  dependencies:
+    end-stream "~0.1.0"
+
+level@3.0.2:
+  version "3.0.2"
+  resolved "http://registry.npm.taobao.org/level/download/level-3.0.2.tgz#83c3d6e48c9e89abc4b6f5ca1c591f177ea2bd59"
+  dependencies:
+    level-packager "^2.0.2"
+    leveldown "^3.0.0"
+    opencollective-postinstall "^2.0.0"
+
+leveldown@3.0.0:
+  version "3.0.0"
+  resolved "http://registry.npm.taobao.org/leveldown/download/leveldown-3.0.0.tgz#a42ef5d4029f88ba538ed8da3e6c34c5b008ddd7"
+  dependencies:
+    abstract-leveldown "~4.0.0"
+    bindings "~1.3.0"
+    fast-future "~1.0.2"
+    nan "~2.8.0"
+    prebuild-install "^2.1.0"
+
+leveldown@^3.0.0:
+  version "3.0.2"
+  resolved "http://registry.npm.taobao.org/leveldown/download/leveldown-3.0.2.tgz#d1fb708991c54c874ca1b0688644a25d926e6302"
+  dependencies:
+    abstract-leveldown "~4.0.0"
+    bindings "~1.3.0"
+    fast-future "~1.0.2"
+    nan "~2.10.0"
+    prebuild-install "^4.0.0"
+
+levelup@3.0.1:
+  version "3.0.1"
+  resolved "http://registry.npm.taobao.org/levelup/download/levelup-3.0.1.tgz#07794639fd0af185089130aaea09d03023637b8d"
+  dependencies:
+    deferred-leveldown "~4.0.0"
+    level-errors "~2.0.0"
+    level-iterator-stream "~2.0.0"
+    xtend "~4.0.0"
+
+levelup@^2.0.0:
+  version "2.0.2"
+  resolved "http://registry.npm.taobao.org/levelup/download/levelup-2.0.2.tgz#83dd22ffd5ee14482143c37cddfb8457854d3727"
+  dependencies:
+    deferred-leveldown "~3.0.0"
+    level-errors "~1.1.0"
+    level-iterator-stream "~2.0.0"
+    xtend "~4.0.0"
+
 leven@^2.1.0:
   version "2.1.0"
   resolved "http://registry.npm.taobao.org/leven/download/leven-2.1.0.tgz#c2e7a9f772094dee9d34202ae8acce4687875580"
@@ -5163,6 +5365,10 @@ lru-cache@~2.6.5:
   version "2.6.5"
   resolved "http://registry.npm.taobao.org/lru-cache/download/lru-cache-2.6.5.tgz#e56d6354148ede8d7707b58d143220fd08df0fd5"
 
+ltgt@2.2.1:
+  version "2.2.1"
+  resolved "http://registry.npm.taobao.org/ltgt/download/ltgt-2.2.1.tgz#f35ca91c493f7b73da0e07495304f17b31f87ee5"
+
 make-dir@^1.0.0:
   version "1.3.0"
   resolved "http://registry.npm.taobao.org/make-dir/download/make-dir-1.3.0.tgz#79c1033b80515bd6d24ec9933e860ca75ee27f0c"
@@ -5327,6 +5533,10 @@ mimic-fn@^1.0.0:
   version "1.2.0"
   resolved "http://registry.npm.taobao.org/mimic-fn/download/mimic-fn-1.2.0.tgz#820c86a39334640e99516928bd03fca88057d022"
 
+mimic-response@^1.0.0:
+  version "1.0.1"
+  resolved "http://registry.npm.taobao.org/mimic-response/download/mimic-response-1.0.1.tgz#4923538878eef42063cb8a3e3b0798781487ab1b"
+
 minimalistic-assert@^1.0.0, minimalistic-assert@^1.0.1:
   version "1.0.1"
   resolved "http://registry.npm.taobao.org/minimalistic-assert/download/minimalistic-assert-1.0.1.tgz#2e194de044626d4a10e7f7fbc00ce73e83e4d5c7"
@@ -5464,10 +5674,14 @@ mute-stream@0.0.7:
   version "0.0.7"
   resolved "http://registry.npm.taobao.org/mute-stream/download/mute-stream-0.0.7.tgz#3075ce93bc21b8fab43e1bc4da7e8115ed1e7bab"
 
-nan@^2.9.2:
+nan@^2.9.2, nan@~2.10.0:
   version "2.10.0"
   resolved "http://registry.npm.taobao.org/nan/download/nan-2.10.0.tgz#96d0cd610ebd58d4b4de9cc0c6828cda99c7548f"
 
+nan@~2.8.0:
+  version "2.8.0"
+  resolved "http://registry.npm.taobao.org/nan/download/nan-2.8.0.tgz#ed715f3fe9de02b57a5e6252d90a96675e1f085a"
+
 nanomatch@^1.2.9:
   version "1.2.13"
   resolved "http://registry.npm.taobao.org/nanomatch/download/nanomatch-1.2.13.tgz#b87a8aa4fc0de8fe6be88895b38983ff265bd119"
@@ -5533,6 +5747,12 @@ no-case@^2.2.0:
   dependencies:
     lower-case "^1.1.1"
 
+node-abi@^2.2.0:
+  version "2.4.3"
+  resolved "http://registry.npm.taobao.org/node-abi/download/node-abi-2.4.3.tgz#43666b7b17e57863e572409edbb82115ac7af28b"
+  dependencies:
+    semver "^5.4.1"
+
 node-cache@^4.1.1:
   version "4.2.0"
   resolved "http://registry.npm.taobao.org/node-cache/download/node-cache-4.2.0.tgz#48ac796a874e762582692004a376d26dfa875811"
@@ -5540,6 +5760,10 @@ node-cache@^4.1.1:
     clone "2.x"
     lodash "4.x"
 
+node-fetch@^2.0.0:
+  version "2.2.0"
+  resolved "http://registry.npm.taobao.org/node-fetch/download/node-fetch-2.2.0.tgz#4ee79bde909262f9775f731e3656d0db55ced5b5"
+
 node-forge@0.7.5:
   version "0.7.5"
   resolved "http://registry.npm.taobao.org/node-forge/download/node-forge-0.7.5.tgz#6c152c345ce11c52f465c2abd957e8639cd674df"
@@ -5600,6 +5824,10 @@ node-pre-gyp@^0.10.0:
     semver "^5.3.0"
     tar "^4"
 
+noop-logger@^0.1.1:
+  version "0.1.1"
+  resolved "http://registry.npm.taobao.org/noop-logger/download/noop-logger-0.1.1.tgz#94a2b1633c4f1317553007d8966fd0e841b6a4c2"
+
 nopt@^4.0.1:
   version "4.0.1"
   resolved "http://registry.npm.taobao.org/nopt/download/nopt-4.0.1.tgz#d0d4685afd5415193c8c7505602d0d17cd64474d"
@@ -5658,7 +5886,7 @@ npm-run-path@^2.0.0:
   dependencies:
     path-key "^2.0.0"
 
-npmlog@^4.0.2:
+npmlog@^4.0.1, npmlog@^4.0.2:
   version "4.1.2"
   resolved "http://registry.npm.taobao.org/npmlog/download/npmlog-4.1.2.tgz#08a7f2a8bf734604779a9efa4ad5cc717abb954b"
   dependencies:
@@ -5771,6 +5999,10 @@ onetime@^2.0.0:
   dependencies:
     mimic-fn "^1.0.0"
 
+opencollective-postinstall@^2.0.0:
+  version "2.0.0"
+  resolved "http://registry.npm.taobao.org/opencollective-postinstall/download/opencollective-postinstall-2.0.0.tgz#5fe062f2706bb84150f7fb1af9f1277e46ec1388"
+
 opener@^1.4.3:
   version "1.4.3"
   resolved "http://registry.npm.taobao.org/opener/download/opener-1.4.3.tgz#5c6da2c5d7e5831e8ffa3964950f8d6674ac90b8"
@@ -6405,6 +6637,70 @@ postcss@^6.0.0, postcss@^6.0.1, postcss@^6.0.17, postcss@^6.0.8:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
+pouchdb@^7.0.0:
+  version "7.0.0"
+  resolved "http://registry.npm.taobao.org/pouchdb/download/pouchdb-7.0.0.tgz#e95df9ef87127d0ea90222d073794bcb47c38648"
+  dependencies:
+    argsarray "0.0.1"
+    buffer-from "1.1.0"
+    clone-buffer "1.0.0"
+    double-ended-queue "2.1.0-0"
+    fetch-cookie "0.7.0"
+    immediate "3.0.6"
+    inherits "2.0.3"
+    level "3.0.2"
+    level-codec "7.0.1"
+    level-write-stream "1.0.0"
+    leveldown "3.0.0"
+    levelup "3.0.1"
+    ltgt "2.2.1"
+    node-fetch "^2.0.0"
+    readable-stream "1.0.33"
+    spark-md5 "3.0.0"
+    through2 "2.0.3"
+    uuid "3.2.1"
+    vuvuzela "1.0.3"
+
+prebuild-install@^2.1.0:
+  version "2.5.3"
+  resolved "http://registry.npm.taobao.org/prebuild-install/download/prebuild-install-2.5.3.tgz#9f65f242782d370296353710e9bc843490c19f69"
+  dependencies:
+    detect-libc "^1.0.3"
+    expand-template "^1.0.2"
+    github-from-package "0.0.0"
+    minimist "^1.2.0"
+    mkdirp "^0.5.1"
+    node-abi "^2.2.0"
+    noop-logger "^0.1.1"
+    npmlog "^4.0.1"
+    os-homedir "^1.0.1"
+    pump "^2.0.1"
+    rc "^1.1.6"
+    simple-get "^2.7.0"
+    tar-fs "^1.13.0"
+    tunnel-agent "^0.6.0"
+    which-pm-runs "^1.0.0"
+
+prebuild-install@^4.0.0:
+  version "4.0.0"
+  resolved "http://registry.npm.taobao.org/prebuild-install/download/prebuild-install-4.0.0.tgz#206ce8106ce5efa4b6cf062fc8a0a7d93c17f3a8"
+  dependencies:
+    detect-libc "^1.0.3"
+    expand-template "^1.0.2"
+    github-from-package "0.0.0"
+    minimist "^1.2.0"
+    mkdirp "^0.5.1"
+    node-abi "^2.2.0"
+    noop-logger "^0.1.1"
+    npmlog "^4.0.1"
+    os-homedir "^1.0.1"
+    pump "^2.0.1"
+    rc "^1.1.6"
+    simple-get "^2.7.0"
+    tar-fs "^1.13.0"
+    tunnel-agent "^0.6.0"
+    which-pm-runs "^1.0.0"
+
 prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "http://registry.npm.taobao.org/prelude-ls/download/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
@@ -6515,6 +6811,13 @@ public-encrypt@^4.0.0:
     parse-asn1 "^5.0.0"
     randombytes "^2.0.1"
 
+pump@^1.0.0:
+  version "1.0.3"
+  resolved "http://registry.npm.taobao.org/pump/download/pump-1.0.3.tgz#5dfe8311c33bbf6fc18261f9f34702c47c08a954"
+  dependencies:
+    end-of-stream "^1.1.0"
+    once "^1.3.1"
+
 pump@^2.0.0, pump@^2.0.1:
   version "2.0.1"
   resolved "http://registry.npm.taobao.org/pump/download/pump-2.0.1.tgz#12399add6e4cf7526d973cbc8b5ce2e2908b3909"
@@ -6620,7 +6923,7 @@ raw-body@2.3.2:
     iconv-lite "0.4.19"
     unpipe "1.0.0"
 
-rc@^1.2.7:
+rc@^1.1.6, rc@^1.2.7:
   version "1.2.8"
   resolved "http://registry.npm.taobao.org/rc/download/rc-1.2.8.tgz#cd924bf5200a075b83c188cd6b9e211b7fc0d3ed"
   dependencies:
@@ -6665,7 +6968,7 @@ read-pkg@^2.0.0:
     normalize-package-data "^2.3.2"
     path-type "^2.0.0"
 
-"readable-stream@1 || 2", readable-stream@2, readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.4, readable-stream@^2.0.6, readable-stream@^2.1.5, readable-stream@^2.2.2, readable-stream@^2.2.9, readable-stream@^2.3.3, readable-stream@^2.3.6:
+"readable-stream@1 || 2", readable-stream@2, readable-stream@^2.0.0, readable-stream@^2.0.1, readable-stream@^2.0.2, readable-stream@^2.0.4, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.1.5, readable-stream@^2.2.2, readable-stream@^2.2.9, readable-stream@^2.3.0, readable-stream@^2.3.3, readable-stream@^2.3.5, readable-stream@^2.3.6:
   version "2.3.6"
   resolved "http://registry.npm.taobao.org/readable-stream/download/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
   dependencies:
@@ -6686,6 +6989,15 @@ readable-stream@1.0:
     isarray "0.0.1"
     string_decoder "~0.10.x"
 
+readable-stream@1.0.33:
+  version "1.0.33"
+  resolved "http://registry.npm.taobao.org/readable-stream/download/readable-stream-1.0.33.tgz#3a360dd66c1b1d7fd4705389860eda1d0f61126c"
+  dependencies:
+    core-util-is "~1.0.0"
+    inherits "~2.0.1"
+    isarray "0.0.1"
+    string_decoder "~0.10.x"
+
 readable-stream@1.1.x:
   version "1.1.14"
   resolved "http://registry.npm.taobao.org/readable-stream/download/readable-stream-1.1.14.tgz#7cf4c54ef648e3813084c636dd2079e166c081d9"
@@ -6695,6 +7007,10 @@ readable-stream@1.1.x:
     isarray "0.0.1"
     string_decoder "~0.10.x"
 
+readable-stream@~0.0.2:
+  version "0.0.4"
+  resolved "http://registry.npm.taobao.org/readable-stream/download/readable-stream-0.0.4.tgz#f32d76e3fb863344a548d79923007173665b3b8d"
+
 readdirp@^2.0.0:
   version "2.1.0"
   resolved "http://registry.npm.taobao.org/readdirp/download/readdirp-2.1.0.tgz#4ed0ad060df3073300c48440373f72d1cc642d78"
@@ -7212,6 +7528,18 @@ signal-exit@^3.0.0, signal-exit@^3.0.2:
   version "3.0.2"
   resolved "http://registry.npm.taobao.org/signal-exit/download/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
 
+simple-concat@^1.0.0:
+  version "1.0.0"
+  resolved "http://registry.npm.taobao.org/simple-concat/download/simple-concat-1.0.0.tgz#7344cbb8b6e26fb27d66b2fc86f9f6d5997521c6"
+
+simple-get@^2.7.0:
+  version "2.8.1"
+  resolved "http://registry.npm.taobao.org/simple-get/download/simple-get-2.8.1.tgz#0e22e91d4575d87620620bc91308d57a77f44b5d"
+  dependencies:
+    decompress-response "^3.3.0"
+    once "^1.3.1"
+    simple-concat "^1.0.0"
+
 simple-statistics@~4.1.0:
   version "4.1.1"
   resolved "http://registry.npm.taobao.org/simple-statistics/download/simple-statistics-4.1.1.tgz#533c48d48336ba3d350d8135f20fa7138acb0c7d"
@@ -7353,6 +7681,10 @@ source-map@^0.6.0, source-map@^0.6.1, source-map@~0.6.0, source-map@~0.6.1:
   version "0.6.1"
   resolved "http://registry.npm.taobao.org/source-map/download/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
 
+spark-md5@3.0.0:
+  version "3.0.0"
+  resolved "http://registry.npm.taobao.org/spark-md5/download/spark-md5-3.0.0.tgz#3722227c54e2faf24b1dc6d933cc144e6f71bfef"
+
 spdx-correct@^3.0.0:
   version "3.0.0"
   resolved "http://registry.npm.taobao.org/spdx-correct/download/spdx-correct-3.0.0.tgz#05a5b4d7153a195bc92c3c425b69f3b2a9524c82"
@@ -7649,6 +7981,27 @@ tape@^4.5.1:
     string.prototype.trim "~1.1.2"
     through "~2.3.8"
 
+tar-fs@^1.13.0:
+  version "1.16.3"
+  resolved "http://registry.npm.taobao.org/tar-fs/download/tar-fs-1.16.3.tgz#966a628841da2c4010406a82167cbd5e0c72d509"
+  dependencies:
+    chownr "^1.0.1"
+    mkdirp "^0.5.1"
+    pump "^1.0.0"
+    tar-stream "^1.1.2"
+
+tar-stream@^1.1.2:
+  version "1.6.1"
+  resolved "http://registry.npm.taobao.org/tar-stream/download/tar-stream-1.6.1.tgz#f84ef1696269d6223ca48f6e1eeede3f7e81f395"
+  dependencies:
+    bl "^1.0.0"
+    buffer-alloc "^1.1.0"
+    end-of-stream "^1.0.0"
+    fs-constants "^1.0.0"
+    readable-stream "^2.3.0"
+    to-buffer "^1.1.0"
+    xtend "^4.0.0"
+
 tar@^4:
   version "4.4.4"
   resolved "http://registry.npm.taobao.org/tar/download/tar-4.4.4.tgz#ec8409fae9f665a4355cc3b4087d0820232bb8cd"
@@ -7679,7 +8032,7 @@ throat@^4.0.0:
   version "4.1.0"
   resolved "http://registry.npm.taobao.org/throat/download/throat-4.1.0.tgz#89037cbc92c56ab18926e6ba4cbb200e15672a6a"
 
-through2@^2.0.0:
+through2@2.0.3, through2@^2.0.0:
   version "2.0.3"
   resolved "http://registry.npm.taobao.org/through2/download/through2-2.0.3.tgz#0004569b37c7c74ba39c43f3ced78d1ad94140be"
   dependencies:
@@ -7722,6 +8075,10 @@ to-arraybuffer@^1.0.0:
   version "1.0.1"
   resolved "http://registry.npm.taobao.org/to-arraybuffer/download/to-arraybuffer-1.0.1.tgz#7d229b1fcc637e466ca081180836a7aabff83f43"
 
+to-buffer@^1.1.0:
+  version "1.1.1"
+  resolved "http://registry.npm.taobao.org/to-buffer/download/to-buffer-1.1.1.tgz#493bd48f62d7c43fcded313a03dcadb2e1213a80"
+
 to-fast-properties@^1.0.3:
   version "1.0.3"
   resolved "http://registry.npm.taobao.org/to-fast-properties/download/to-fast-properties-1.0.3.tgz#b83571fa4d8c25b82e231b06e3a3055de4ca1a47"
@@ -7762,7 +8119,7 @@ toposort@^1.0.0:
   version "1.0.7"
   resolved "http://registry.npm.taobao.org/toposort/download/toposort-1.0.7.tgz#2e68442d9f64ec720b8cc89e6443ac6caa950029"
 
-tough-cookie@>=2.3.3, tough-cookie@^2.3.3:
+tough-cookie@>=2.3.3, tough-cookie@^2.3.1, tough-cookie@^2.3.3:
   version "2.4.3"
   resolved "http://registry.npm.taobao.org/tough-cookie/download/tough-cookie-2.4.3.tgz#53f36da3f47783b0925afa06ff9f3b165280f781"
   dependencies:
@@ -8003,6 +8360,10 @@ utils-merge@1.0.1:
   version "1.0.1"
   resolved "http://registry.npm.taobao.org/utils-merge/download/utils-merge-1.0.1.tgz#9f95710f50a267947b2ccc124741c1028427e713"
 
+uuid@3.2.1:
+  version "3.2.1"
+  resolved "http://registry.npm.taobao.org/uuid/download/uuid-3.2.1.tgz#12c528bb9d58d0b9265d9a2f6f0fe8be17ff1f14"
+
 uuid@^3.0.1, uuid@^3.1.0:
   version "3.3.2"
   resolved "http://registry.npm.taobao.org/uuid/download/uuid-3.3.2.tgz#1b4af4955eb3077c501c23872fc6513811587131"
@@ -8147,6 +8508,10 @@ vuex@^3.0.1:
   version "3.0.1"
   resolved "http://registry.npm.taobao.org/vuex/download/vuex-3.0.1.tgz#e761352ebe0af537d4bb755a9b9dc4be3df7efd2"
 
+vuvuzela@1.0.3:
+  version "1.0.3"
+  resolved "http://registry.npm.taobao.org/vuvuzela/download/vuvuzela-1.0.3.tgz#3be145e58271c73ca55279dd851f12a682114b0b"
+
 w3c-hr-time@^1.0.1:
   version "1.0.1"
   resolved "http://registry.npm.taobao.org/w3c-hr-time/download/w3c-hr-time-1.0.1.tgz#82ac2bff63d950ea9e3189a58a65625fedf19045"
@@ -8330,6 +8695,10 @@ which-module@^2.0.0:
   version "2.0.0"
   resolved "http://registry.npm.taobao.org/which-module/download/which-module-2.0.0.tgz#d9ef07dce77b9902b8a3a8fa4b31c3e3f7e6e87a"
 
+which-pm-runs@^1.0.0:
+  version "1.0.0"
+  resolved "http://registry.npm.taobao.org/which-pm-runs/download/which-pm-runs-1.0.0.tgz#670b3afbc552e0b55df6b7780ca74615f23ad1cb"
+
 which@^1.2.12, which@^1.2.9, which@^1.3.0:
   version "1.3.1"
   resolved "http://registry.npm.taobao.org/which/download/which-1.3.1.tgz#a45043d54f5805316da8d62f9f50918d3da70b0a"
@@ -8387,6 +8756,12 @@ write-file-atomic@^2.1.0:
     imurmurhash "^0.1.4"
     signal-exit "^3.0.2"
 
+write-stream@~0.4.3:
+  version "0.4.3"
+  resolved "http://registry.npm.taobao.org/write-stream/download/write-stream-0.4.3.tgz#83cc8c0347d0af6057a93862b4e3ae01de5c81c1"
+  dependencies:
+    readable-stream "~0.0.2"
+
 write@^0.2.1:
   version "0.2.1"
   resolved "http://registry.npm.taobao.org/write/download/write-0.2.1.tgz#5fc03828e264cea3fe91455476f7a3c566cb0757"
@@ -8408,7 +8783,7 @@ xregexp@2.0.0:
   version "2.0.0"
   resolved "http://registry.npm.taobao.org/xregexp/download/xregexp-2.0.0.tgz#52a63e56ca0b84a7f3a5f3d61872f126ad7a5943"
 
-xtend@^4.0.0, xtend@~4.0.1:
+xtend@^4.0.0, xtend@^4.0.1, xtend@~4.0.0, xtend@~4.0.1:
   version "4.0.1"
   resolved "http://registry.npm.taobao.org/xtend/download/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"