如何在一个JS函数中重写另一个函数？

function originalFunction() {
  console.log("Original function");
}

originalFunction(); // 输出：Original function

function originalFunction() {
  console.log("Overridden function");
}

originalFunction(); // 输出：Overridden function

var originalFunction = function() {
  console.log("Original function");
}

originalFunction(); // 输出：Original function

originalFunction = function() {
  console.log("Overridden function");
}

originalFunction(); // 输出：Overridden function

function MyObject() {}

MyObject.prototype.originalFunction = function() {
  console.log("Original function");
}

var obj = new MyObject();
obj.originalFunction(); // 输出：Original function

MyObject.prototype.originalFunction = function() {
  console.log("Overridden function");
}

obj.originalFunction(); // 输出：Overridden function