手动将 es6 箭头函数转换为 es5？

Question

How do we convert the arrow function below to es5 manually?

e => varName = e.target.value

My attempt:

function(e) {
 varName = e.target.value
 return varName
}

Am I right?

What about this below?

varName = function(e) {
 return e.target.value
}

Answer 1

Both of them are extremely similar and perform nearly the same task, however the ES6 function implicitly creates a global variable named varName and assigns it a value, and neither of the ES5 functions do that. This one is pretty much exactly the same:

function(e) {
  return varName = e.target.value;
}

Or:

function(e) {
  varName = e.target.value;
  return varName;
}