javascript - 通过扩展来覆盖函数并根据条件执行扩展函数

Question

我有一个函数，我想重写这个函数，然后我想基于几个全局值执行重写的函数。

var myName = 'Raju';
function x() {
  console.log(myName);
}

//Now extend the function and based on condition like if myName === 'Raju' alert the name

Answer 1

希望这对您有帮助!

var myName = 'Raju';
function x() {
  console.log(myName);
}

// overwrite the global function, passing the old function as oldFn
x = (function(oldFn) {
  function extendedFn() {
    oldFn();
    if (myName == 'Raju') {
      alert('hi');
    }
  }
  return extendedFn;
})(x);


x();