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前端跨域问题的解决方案Access to XMLHttpRequest at ‘http..’ from origin ‘null‘ has been blocked by CORS policy

前言:在前端发出Ajax请求的时候,有时候会产生跨域问题,报错如下:AccesstoXMLHttpRequestat'http://127.0.0.1/api/post'fromorigin'null'hasbeenblockedbyCORSpolicy:No'Access-Control-Allow-Origin'headerispresentontherequestedresource.针对以上问题,本文提供两种解决方案,CORS中间件和JSONP方法。在具体介绍解决方法之前,我们先明确以下前提条件:1、这两个方法都需要通过后端修改接口情况,无法单独通过前端解决跨域问题。2、什么是跨域?什

前端跨域问题的解决方案Access to XMLHttpRequest at ‘http..’ from origin ‘null‘ has been blocked by CORS policy

前言:在前端发出Ajax请求的时候,有时候会产生跨域问题,报错如下:AccesstoXMLHttpRequestat'http://127.0.0.1/api/post'fromorigin'null'hasbeenblockedbyCORSpolicy:No'Access-Control-Allow-Origin'headerispresentontherequestedresource.针对以上问题,本文提供两种解决方案,CORS中间件和JSONP方法。在具体介绍解决方法之前,我们先明确以下前提条件:1、这两个方法都需要通过后端修改接口情况,无法单独通过前端解决跨域问题。2、什么是跨域?什

npm info: node: --openssl-legacy-provider is not allowed in NODE_OPTIONS

[INFO]---frontend-maven-plugin:1.9.1:yarn(yarninstall)@jhonline---[INFO]Running'yarn'inC:\Users\Developer_T\IdeaProjects\OpenSource\jhipster-online[INFO]node:--openssl-legacy-providerisnotallowedinNODE_OPTIONS[INFO]------------------------------------------------------------------------[INFO]BUILDFA

npm info: node: --openssl-legacy-provider is not allowed in NODE_OPTIONS

[INFO]---frontend-maven-plugin:1.9.1:yarn(yarninstall)@jhonline---[INFO]Running'yarn'inC:\Users\Developer_T\IdeaProjects\OpenSource\jhipster-online[INFO]node:--openssl-legacy-providerisnotallowedinNODE_OPTIONS[INFO]------------------------------------------------------------------------[INFO]BUILDFA

mysql报错The MySQL server is running with the LOCK_WRITE_GROWTH option so it cannot executethisstatem

今天mysql报错TheMySQLserverisrunningwiththeLOCK_WRITE_GROWTHoptionsoitcannotexecutethisstatement小编特此记录一下问题。当mysql出现这个报错时,是因为mysql的存储空间爆满了。 此时我们要进行排查,排查的方向:1.数据2.mysql的备份3.日志小编这里数据正常,备份正常,日志也正常,3个加起来还不到100G(小编的存储300G),然后小编查看了MySQL的系统文件,命令:SELECTfile_name,CONCAT(TOTAL_EXTENTS,'MB')AS'FileSize'FROMINFORMAT

mysql报错The MySQL server is running with the LOCK_WRITE_GROWTH option so it cannot executethisstatem

今天mysql报错TheMySQLserverisrunningwiththeLOCK_WRITE_GROWTHoptionsoitcannotexecutethisstatement小编特此记录一下问题。当mysql出现这个报错时,是因为mysql的存储空间爆满了。 此时我们要进行排查,排查的方向:1.数据2.mysql的备份3.日志小编这里数据正常,备份正常,日志也正常,3个加起来还不到100G(小编的存储300G),然后小编查看了MySQL的系统文件,命令:SELECTfile_name,CONCAT(TOTAL_EXTENTS,'MB')AS'FileSize'FROMINFORMAT

解决mysql的赋权操作之GRANT ALL PRIVILEGES ON *.* TO ‘root‘@‘%‘ IDENTIFIED BY ‘123456‘ WITH GRANT OPTION问题

一种情况mysql的赋权操作:GRANTALLPRIVILEGESON*.*TO‘root‘@‘%‘IDENTIFIEDBY‘123456‘WITHGRANTOPTION;mysql赋权操作:GRANTALLPRIVILEGESON*.*TO'root'@'%'IDENTIFIEDBY'123456'WITHGRANTOPTION;flushprivileges;GRANT:赋权命令ALLPRIVILEGES:当前用户的所有权限ON:介词*.*:当前用户对所有数据库和表的相应操作权限TO:介词‘root’@’%’:权限赋给root用户,所有ip都能连接IDENTIFIEDBY‘123456’:

解决mysql的赋权操作之GRANT ALL PRIVILEGES ON *.* TO ‘root‘@‘%‘ IDENTIFIED BY ‘123456‘ WITH GRANT OPTION问题

一种情况mysql的赋权操作:GRANTALLPRIVILEGESON*.*TO‘root‘@‘%‘IDENTIFIEDBY‘123456‘WITHGRANTOPTION;mysql赋权操作:GRANTALLPRIVILEGESON*.*TO'root'@'%'IDENTIFIEDBY'123456'WITHGRANTOPTION;flushprivileges;GRANT:赋权命令ALLPRIVILEGES:当前用户的所有权限ON:介词*.*:当前用户对所有数据库和表的相应操作权限TO:介词‘root’@’%’:权限赋给root用户,所有ip都能连接IDENTIFIEDBY‘123456’:

报错:Only the original thread that created a view hierarchy can touch its views.

报错:Log:onCrashed()–>android.view.ViewRootImpl$CalledFromWrongThreadException:Onlytheoriginalthreadthatcreatedaviewhierarchycantouchitsviews.报错原因:一般在主线程操作UI,而此次有可能在子线程里操作了UI解决方案:在代码中找到涉及UI操作的代码,看它是在哪个线程里进行操作。为里便于查看是在主线程还是子线程,可用以下方法判别:1、查看当前线程idlongid=Thread.currentThread().getId();2、查看当前线程名字Stringnam

报错:Only the original thread that created a view hierarchy can touch its views.

报错:Log:onCrashed()–>android.view.ViewRootImpl$CalledFromWrongThreadException:Onlytheoriginalthreadthatcreatedaviewhierarchycantouchitsviews.报错原因:一般在主线程操作UI,而此次有可能在子线程里操作了UI解决方案:在代码中找到涉及UI操作的代码,看它是在哪个线程里进行操作。为里便于查看是在主线程还是子线程,可用以下方法判别:1、查看当前线程idlongid=Thread.currentThread().getId();2、查看当前线程名字Stringnam