问JavaScript：*可以*用call / apply / bind设置未定义的属性吗？

EN

let test;

function setProp() {
  this.prop = 42;
}
setProp.call(test);

// No error yet?
// So 42 should be saved inside test.prop?

// Though test=undefined?

console.log(test);
try {
  console.log(test.prop);
} catch (e) {
  console.log(e.message);
}

// -> undefined
// -> Cannot read property 'prop' of undefined
// Ok, indeed

function getProp() {
  console.log(this.prop);
}
getProp.call(test);

// -> 42
// Wait, what?