无法运行javascript公共功能

Question

Hi I am createing Canvas CreateJS based drag and drop quiz, the error is when I drop any object then I need to run a function goback() which is available in that class but I dn't know why it's not accessible.

http://www.fltech.in/canvas/dragndrop/

Answer 1

Because in your dropbox function, this no longer refers to the outside scope. You can change all this.a = to var a , and use goback() directly in dropbox rather than using this.goback() .

You can refer to http://ryanmorr.com/understanding-scope-and-context-in-javascript/ for more information about this in javascript.