One JavaScript instance every day-canvas timer dynamically updates a line, javascript-canvas

One JavaScript instance every day-canvas timer dynamically updates a line, javascript-canvas

<! DOCTYPE html> 



Javascript defines a class for display in canvas. After an instance is generated, how can we execute corresponding mouse events on it?
This operation can only add events to the canvas, and then determine whether the clicked Position overlaps the rectangle.

Call dynamic statements in a javascript Timer
That is definitely not enough, because you put the data into js and directly process it with you. I think the time should be the same, and your data volume is so large, it must be very slow.

Ajax is the best method.

A small amount of data is called each time and processed multiple times.

The idea is to create another page for generating xml, and generate the xml format of your data by passing parameters (this can be done in a way similar to Paging for data retrieval.