我觉得这将是其中一个“哦，jeez，我怎么问这个问题”的问题，但是......
// So I create an object:
var o = {};
// I assign a string value to a variable:
var prop1 = "prop_key";
// And I use that variable that resolves to that string as the property name:
o[prop1] = "value1";
// => So far so good, the property key is the right value:
console.log(o); // => Object {prop_key: "value1"}
// Moving on, I am malicious and overwrite the `prop1` variable, replacing the original value to say, another string:
prop1 = "evil_string";
// And just to make sure it worked:
console.log(prop1); // => evil_value:
// AND YET, when I query the object...
console.log(o); // => Object {prop_key: "value1"}
现在不应该输出Object{"evil_value": "val1"}，因为o[prop1]不再指向原来的prop_key值吗？