我可以更改/覆盖 window.getSelection() 的定义吗？

Question

I would like to know how can I change the definition of a native JS function.

I need to do this in order to test an exploit for a Chrome extension that my team is developing. Specifically, I want the window.getSelection() function to return a value of my choice instead of actual selected text in screen.

Answer 1

You probably want to 'patch' the getSelection function, so

var originalGetSelection = window.getSelection;
window.getSelection = function() {
// your own stuff here
const args = Array.prototype.slice.call(arguments); // convert arguments as array of
return originalGetSelection.apply(window, args);
}