how to use JavaScript to calculate the coordinates of x2 and y2 after the elements in the figure are rotated? the center point of rotation is the center point of dashed wireframe ...
var code= 456 var bol1 = ^[0-9]*$ .test(code) var bol2 = ^[a-zA-Z]*$ .test(code) var bol3 = ^[ u4e00- u9fa5]*$ .test(code) if (bol1 || bol2 || bol3) { } the above three regularities are used to judge only pure numbers or letters, or pure Ch...
problem description react uses create-react-app to build the environment node intends to use the Express framework Q: want to know how to structure the project if you use node to develop the backend? Q: do you want to open two services if you run ...
The completion field of pycharm is selected from above and below the keyboard button. I want to use the tab key instead, that is, to move the selection back and forth with the tab key. How can I change it? ...
public static void printObjects(List<List<?>> args) { } public static void main(String[] args) { List<List<String>> list = new ArrayList<>(); printObjects(list); } now you want List < list ...
define a function first function say(){ alert( Hi! ); } define another custom data type class Dog{ constructor(name){ this.name = name; } saysay say ??? } ...