npm install monkeyify``javascript
// demo: By monkeyify the atob function let atob support base64 url
window.atob = monkeyify(window.atob, {
// bind a caller, the default is the caller when the monkeyify function is called
caller: window,
// true(To monkeyify a monkeyifyed function is allowed)
// 'return old monkey'(Return the first monkeyifyed function when you want to monkeyify a monkeyifyed function)
allowMonkeyInMonkey: 'return old monkey';
// monkey patch function. caller, args array and the original function
monkey: function (caller, args, original) {
var base64url = args[0];
var d = 4 - base64url.length % 4;
while (d-->0) {
base64url += '=';
}
args[0] = base64url
.replace(/\-/g, "+")
.replace(/_/g, "/");
return original.apply(caller, args);
}
});
// or
window.atob = monkeyify(window.atob, function () {
// your code
});
``