jpush.registration_id (Context context) device dev_id= 18071adc03573821234 how to jpush.registration_id (dev_id)? how does the context Context pass variables? ...
resort to a Python loop to read the file, assign a value to the read string, and then further generate json file. was supposed to be written in shell, using things like while read line do. Done < table.list. but json file doesn t know how to write i...
public class Food { } public class Fruit extends Food { } public class Apple extends Fruit { } ArrayList<? super Fruit> arrayList = new ArrayList<>(); arrayList.add(new Apple()); arrayList.add(new Fruit()); arrayList.add(ne...
how many statements are queried in medoo for example: query classification category table: cateid-name-parentid 1-clothes-0 2-shoes-0 3-short sleeves-1 query output classification + subclassification (only secondary, according to parentid outpu...
HTML <div class="box"> <div class="div1" style="background:red;">< div> <div class="div2" style="background:blue;">< div> <div class="div3" style=&...
problem description create a student Schame, with mongoose but report an error at run time, the error is in the Schema; of the third line TypeError: schema is not a constructor looked at the code did not find a mistake, please help to have a look, t...