< H2 > question: as shown below: < H2 > this is a flowchart configuration page. The nodes in the whole flowchart can be connected in a lifetime. I can traverse all the lines in the whole graph, and each line has two anchor points: sourceId and target...
problem description The requirement is like this: when I click the right mouse button to come out a menu, and then click New, there will be a right editing mania. When I click Save , I will create a new menu where I click the right mouse button. This...
var str = aaaaaaaaaabbbbbbbbbbcccccccccc( ; if (! ^ s*[a-zA-Z0-9]+( s*[a-zA-Z0-9]+)* s*$ .test(str)) { alert( ); } : cccccccccc additional requirements: only content is allowed to be a combination of [letters, numbers, spaces], b...
want to display data in listview on fragment, but can only display a listview background color the location of the navigation bar should show the news data below, but it is empty. mainactivity Code public class MainActivity extends FragmentActi...
iOS uses pod to search and install DifferenceKit prompts that the installation failed and could not be found. Is there any way to solve it? Or the problem of uploading by the author himself. All other pod libraries are normal: Unable to find a pod wit...
tinyint that has been used before for fields that represent data types or states has not paid attention to the bit type. After consulting the data, we know that bit is stored in binary format: bounded 0 or bounded 1 its storage unit is direc...
^ C2018-04-27 10:47:58 [scrapy.crawler] INFO: Received SIG_SETMASK, shutting down gracefully. Send again to force ^ C2018-04-27 10:47:58 [scrapy.crawler] INFO: Received SIG_SETMASK twice, forcing unclean shutdown often get stuck and occasionally prom...