使用老師gitlab程式碼

dlook

var e2c = { dog: '狗', cat: '貓', a: '一隻', chase: '追', eat: '吃' };

function look (e) {
  return e2c[e]
}

console.log('args=', Deno.args)
let e = Deno.args[0] // 從 process.argv 這個陣列取出第二個元素
let c = look(e)
console.log(e + '=' + c)
-->
(PS C:\code\wp\03-js\06-json> deno run dlook.js dog)
args= [ "dog" ]
dog=狗

json

var george = {
  'name': 'George',
  'age': 25,
  'friends': [
     { 'name': 'John', 'age': 22 },
     { 'name': 'Mary', 'age': 28 }
  ]
}

console.log('george = ', george)
console.log('george.age=' + george.age)
console.log('george.friends:')
var friends = george.friends
for (let i in friends) {
  console.log('    ' + friends[i].name + ' is ' + friends[i].age + ' years old!')
}
-->
george =  {
  name: "George",
  age: 25,
  friends: [ { name: "John", age: 22 }, { name: "Mary", age: 28 } ]
}
george.age=25
george.friends:
    John is 22 years old!
    Mary is 28 years old!

circle

var circle = {
  r:3, 
  area:function() {
    return 3.14*this.r*this.r;
  }
}

console.log("circle.r=", circle.r);

console.log("circle.area()=", circle.area());
-->
circle.r= 3
circle.area()= 28.259999999999998

circleClass

class Circle {
  constructor(r) {
    this.r = r
  }
  area() {
    return 3.14*this.r*this.r;
  }
}

var c1 = new Circle(1)
console.log("c1.r=", c1.r);
console.log("c1.area()=", c1.area());
var c2 = new Circle(2)
console.log("c2.area()=", c2.area());
-->
c1.r= 1
c1.area()= 3.14
c2.area()= 12.56