Hopper分析文件得到如下函数，发现链接：
http://codown.youdao.com/cidian/OfflineDict/macDict/offline_dict.xml
文件内容如下：
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This XML file does not appear to have any style information associated with it. The document tree is shown below.<resource><type>Dictionary</type><list><item><id>oxford_advance.dat</id><describe>牛津词典</describe><size>13431451</size><number>43156</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/oxford_advance.dat</url><md5>5f01359c9f9bc2d96eadb21403da6fbf</md5><vip type="bool">false</vip></item><item><id>newoxford.dat</id><describe>新牛津词典</describe><size>22139793</size><number>92526</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/newoxford.dat</url><md5>4b10d9ee2984217939751aebbbe15068</md5><vip type="bool">true</vip></item><item><id>huge_ec.dat</id><describe>超大英汉词库</describe><size>48982442</size><number>883366</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/huge_ec.dat</url><md5>5dd404424063cf65f06670338eb753f9</md5><vip type="bool">true</vip></item><item><id>huge_ce.dat</id><describe>超大汉英词库</describe><size>54122069</size><number>27356</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/huge_ce.dat</url><md5>5ea89a9ccfb6c2f761eea5237d7ae3ab</md5><vip type="bool">true</vip></item><item><id>webster.dat</id><describe>韦氏词典</describe><size>13535368</size><number>89686</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/webster.dat</url><md5>fc16a955567ae56049babe65fbb8a857</md5><vip type="bool">true</vip></item><item><id>21dict.dat</id><describe>21世纪大英汉词典</describe><size>27138312</size><number>184700</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/21dict.dat</url><md5>73eea8108b01eb7a1b32520728485437</md5><vip type="bool">false</vip></item><item><id>ee_3.dat</id><describe>英英释义</describe><size>20826950</size><number>230172</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/ee_3.dat</url><md5>43E8050963A68D42CB26B91BC983E1BD</md5><vip type="bool">false</vip></item><item><id>hanying.dat</id><describe>新汉英大辞典</describe><size>18075818</size><number>145006</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/hanying.dat</url><md5>3a3c21f8425299b827b5f4dfa9c6a42b</md5><vip type="bool">false</vip></item><item><id>hh_3.dat</id><describe>现代汉语大词典</describe><size>14520500</size><number>110084</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/hh_3.dat</url><md5>928A3FD01584CD5B16D72E1704BEE6FD</md5><vip type="bool">false</vip></item><item><id>phrase_3.dat</id><describe>词组短语</describe><size>2249478</size><number>27356</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/phrase_3.dat</url><md5>FF316DB23317C922B9DD8AD3797A57AD</md5><vip type="bool">false</vip></item><item><id>syno_3.dat</id><describe>同近义词</describe><size>5028138</size><number>118215</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/syno_3.dat</url><md5>2DEA17952FC36A036E29434294CDEC16</md5><vip type="bool">false</vip></item><item><id>voiceUS.dat</id><describe>美式离线语音</describe><size>42280338</size><number>19463</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/voiceUS.dat</url><md5>ba3416283ab3ae5694703f3a6e3adfc2</md5><vip type="bool">false</vip></item><item><id>voiceUK.dat</id><describe>英式离线语音</describe><size>37638716</size><number>19241</number><subtype>usual</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/voiceUK.dat</url><md5>ac12d1a96a8a03e4e2dd5cd906717db2</md5><vip type="bool">false</vip></item><item><id>special_economy.dat</id><describe>经济学</describe><size>11166708</size><number>222482</number><subtype>specialty</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/special_economy.dat</url><md5>12f5a9314d70a1e079d8995caff03fcc</md5><vip type="bool">true</vip></item><item><id>special_medicine.dat</id><describe>医药科学</describe><size>11310554</size><number>151429</number><subtype>specialty</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/special_medicine.dat</url><md5>e73646f22b72ed6d0c9441631fef73cc</md5><vip type="bool">true</vip></item><item><id>special_elec_commu_auto_control.dat</id><describe>电子、通信与自动控制技术</describe><size>8346804</size><number>134903</number><subtype>specialty</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/special_elec_commu_auto_control.dat</url><md5>256e29cb64af87065e759b1081c07062</md5><vip type="bool">true</vip></item><item><id>special_mechanical.dat</id><describe>机械工程</describe><size>6880510</size><number>129227</number><subtype>specialty</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/special_mechanical.dat</url><md5>1c19e7357d70b8c8d2d983c560d8b1db</md5><vip type="bool">true</vip></item><item><id>special_energy.dat</id><describe>能源科学技术</describe><size>6414598</size><number>131627</number><subtype>specialty</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/special_energy.dat</url><md5>5857bbfa15c2e7beb297e995164c7d9a</md5><vip type="bool">true</vip></item><item><id>special_biology.dat</id><describe>生物学</describe><size>5684408</size><number>161248</number><subtype>specialty</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/special_biology.dat</url><md5>511daa3541343a6b7a00ea97cfd03a89</md5><vip type="bool">true</vip></item><item><id>special_traffic.dat</id><describe>交通运输工程</describe><size>5292894</size><number>132753</number><subtype>specialty</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/special_traffic.dat</url><md5>4619304365eddf442e50f8be9eb2e0f7</md5><vip type="bool">true</vip></item><item><id>special_computer.dat</id><describe>计算机科学技术</describe><size>11842874</size><number>197130</number><subtype>specialty</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/special_computer.dat</url><md5>7a386414d31b5ec2c2fa170028645890</md5><vip type="bool">true</vip></item><item><id>special_other.dat</id><describe>其他学科</describe><size>46241574</size><number>711880</number><subtype>specialty</subtype><url>http://codown.youdao.com/cidian/OfflineDict/macDict/special_other.dat</url><md5>2186328a5925cb1e95c6ccd601bf5ee4</md5><vip type="bool">true</vip></item></list></resource> |
下载地址：
http://codown.youdao.com/cidian/OfflineDict/macDict/oxford_advance.dat http://codown.youdao.com/cidian/OfflineDict/macDict/newoxford.dat http://codown.youdao.com/cidian/OfflineDict/macDict/huge_ec.dat http://codown.youdao.com/cidian/OfflineDict/macDict/huge_ce.dat http://codown.youdao.com/cidian/OfflineDict/macDict/webster.dat http://codown.youdao.com/cidian/OfflineDict/macDict/21dict.dat http://codown.youdao.com/cidian/OfflineDict/macDict/ee_3.dat http://codown.youdao.com/cidian/OfflineDict/macDict/hanying.dat http://codown.youdao.com/cidian/OfflineDict/macDict/hh_3.dat http://codown.youdao.com/cidian/OfflineDict/macDict/phrase_3.dat http://codown.youdao.com/cidian/OfflineDict/macDict/syno_3.dat http://codown.youdao.com/cidian/OfflineDict/macDict/voiceUS.dat http://codown.youdao.com/cidian/OfflineDict/macDict/voiceUK.dat http://codown.youdao.com/cidian/OfflineDict/macDict/special_economy.dat http://codown.youdao.com/cidian/OfflineDict/macDict/special_medicine.dat http://codown.youdao.com/cidian/OfflineDict/macDict/special_elec_commu_auto_control.dat http://codown.youdao.com/cidian/OfflineDict/macDict/special_mechanical.dat http://codown.youdao.com/cidian/OfflineDict/macDict/special_energy.dat http://codown.youdao.com/cidian/OfflineDict/macDict/special_biology.dat http://codown.youdao.com/cidian/OfflineDict/macDict/special_traffic.dat http://codown.youdao.com/cidian/OfflineDict/macDict/special_computer.dat http://codown.youdao.com/cidian/OfflineDict/macDict/special_other.dat
字典的保存路径为(MacOS版本)：
/Users/zyjsuper/Library/Containers/com.youdao.YoudaoDict/Data/Documents/PurchasedDictionary
离线字典的本地更新策略
本地离线字典配置文件
/Users/zyjsuper/Library/Containers/com.youdao.YoudaoDict/Data/Documents/PurchasedDictionary/offlineDictConfig.txt
或者/Users/zyjsuper/Documents/PurchasedDictionary/offlineDictConfig.txt
内容如下：
{"resourceList":[{"vip":"false","id":"oxford_advance.dat","downloaded":"true","md5":"5f01359c9f9bc2d96eadb21403da6fbf","subtype":"usual"},{"vip":"true","id":"newoxford.dat","downloaded":"false","md5":"4b10d9ee2984217939751aebbbe15068","subtype":"usual"},{"vip":"true","id":"huge_ec.dat","downloaded":"false","md5":"5dd404424063cf65f06670338eb753f9","subtype":"usual"},{"vip":"true","id":"huge_ce.dat","downloaded":"false","md5":"5ea89a9ccfb6c2f761eea5237d7ae3ab","subtype":"usual"},{"vip":"true","id":"webster.dat","downloaded":"false","md5":"fc16a955567ae56049babe65fbb8a857","subtype":"usual"},{"vip":"false","id":"21dict.dat","downloaded":"false","md5":"73eea8108b01eb7a1b32520728485437","subtype":"usual"},{"vip":"false","id":"ee_3.dat","downloaded":"true","md5":"43E8050963A68D42CB26B91BC983E1BD","subtype":"usual"},{"vip":"false","id":"hanying.dat","downloaded":"true","md5":"3a3c21f8425299b827b5f4dfa9c6a42b","subtype":"usual"},{"vip":"false","id":"hh_3.dat","downloaded":"false","md5":"928A3FD01584CD5B16D72E1704BEE6FD","subtype":"usual"},{"vip":"false","id":"phrase_3.dat","downloaded":"true","md5":"FF316DB23317C922B9DD8AD3797A57AD","subtype":"usual"},{"vip":"false","id":"syno_3.dat","downloaded":"true","md5":"2DEA17952FC36A036E29434294CDEC16","subtype":"usual"},{"vip":"false","id":"voiceUS.dat","downloaded":"false","md5":"ba3416283ab3ae5694703f3a6e3adfc2","subtype":"usual"},{"vip":"false","id":"voiceUK.dat","downloaded":"false","md5":"ac12d1a96a8a03e4e2dd5cd906717db2","subtype":"usual"},{"vip":"true","id":"special_economy.dat","downloaded":"false","md5":"12f5a9314d70a1e079d8995caff03fcc","subtype":"specialty"},{"vip":"true","id":"special_medicine.dat","downloaded":"false","md5":"e73646f22b72ed6d0c9441631fef73cc","subtype":"specialty"},{"vip":"true","id":"special_elec_commu_auto_control.dat","downloaded":"false","md5":"256e29cb64af87065e759b1081c07062","subtype":"specialty"},{"vip":"true","id":"special_mechanical.dat","downloaded":"false","md5":"1c19e7357d70b8c8d2d983c560d8b1db","subtype":"specialty"},{"vip":"true","id":"special_energy.dat","downloaded":"false","md5":"5857bbfa15c2e7beb297e995164c7d9a","subtype":"specialty"},{"vip":"true","id":"special_biology.dat","downloaded":"false","md5":"511daa3541343a6b7a00ea97cfd03a89","subtype":"specialty"},{"vip":"true","id":"special_traffic.dat","downloaded":"false","md5":"4619304365eddf442e50f8be9eb2e0f7","subtype":"specialty"},{"vip":"true","id":"special_computer.dat","downloaded":"false","md5":"7a386414d31b5ec2c2fa170028645890","subtype":"specialty"},{"vip":"true","id":"special_other.dat","downloaded":"false","md5":"2186328a5925cb1e95c6ccd601bf5ee4","subtype":"specialty"}]}
可以判断出此文件内容来源于http://codown.youdao.com/cidian/OfflineDict/macDict/offline_dict.xml这个文件，
其中"vip":"true"表示此字典需要vip权限，将其改成"vip":"false"，打开app验证，结果发现文件被替换成原来的样子，我想到的办法是锁定文件。
使用Finder打开文件所在路径，右击文件名点击“显示简介”，将文件改成“已锁定”，这样这个文件就不会被覆盖了，离线词典就可以使用了。
