分析脱坑之处：了解“ReferenceError: deprecated caller or arguments usage”的坑源

今天不小心又掉进坑了，来来吧，看看是什么坑吧。

错误提示：

Warning: referenceerror: dePRecated caller usage (firefox)
Warning: ReferenceError: deprecated arguments usage (Firefox)
typeError: 'callee' and 'caller' cannot be accessed in strict mode. (Safari)

"use strict";

function myFunc() {
  if (myFunc.caller == null) {
    return "The function was called from the top!";
  } else {
    return "this function's caller was " + myFunc.caller;
  }
}

myFunc();
// Warning: ReferenceError: deprecated caller usage
// "The function was called from the top!"

Function.arguments

"use strict";

function f(n) {
  g(n - 1);
}

function g(n) {
  console.log("before: " + g.arguments[0]);
  if (n > 0) {
    f(n);
  }
  console.log("after: " + g.arguments[0]);
}

f(2);

console.log("returned: " + g.arguments);
// Warning: ReferenceError: deprecated arguments usage

了解完，是不是懵逼了，其实是自己技术没更新迭代啊。