qiilee

A: Person {firstName: "Lydia", lastName: "Hallie"} and undefined B: Person {firstName:...

A: TypeError B: SyntaxError C: Lydia Hallie D: undefined undefined 参考答案：...

```javascript let greeting greetign = {} // Typo! console.log(greetign) ``` - A: `{}` ...

```javascript class Chameleon { static colorChange(newColor) { this.newColor = newColo...

A: Hello B: undefined C: ReferenceError D: TypeError 参考答案：...

A: mouse.bird.size B: mouse[bird.size] C: mouse[bird["size"]] D: All of them are valid...

A: 1 and false B: false and NaN C: false and false 参考答案：...

A: 20 and 62.83185307179586 B: 20 and NaN C: 20 and 63 D: NaN and 63 参考答案：...

```javascript for (var i = 0; i < 3; i++) { setTimeout(() => console.log(i), 1) } for ...

```javascript function sayHi() { console.log(name) console.log(age) var name = 'Lydia'...

```js String.prototype.giveLydiaPizza = () => { return "Just give Lydia pizza already!...

```js function bark() { console.log('Woof!'); } bark.animal = 'dog'; ``` ``` A：Nothing...

```js let a = 3; let b = new Number(3) let c = 3; console.log(a == b); console.log(a =...

```js [1, 2, 3, 4].reduce((x, y) => console.log(x, y)) ``` ``` A: 1 2 and 3 3 and 6 4 ...

```js function getAge(...args) { console.log(typeof args); } getAge(21); ``` ``` A: "n...

```js let name = "Lydia"; function getName() { console.log(name); let name = "Sarah"; ...

```js let newList = [1, 2, 3].push(4); console.log(newList.push(5)); ``` ``` A: [1,2,3...

```js console.log("🐭" + "🐍"); ``` ``` A: 🐭🐍 B:257548 C:A string containing their c...