1. JavaScrip中所有事物都是对象：字符串、数字、日期、等等
2. 在javaScripe中，对象是拥有属性和方法的数据
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8" />
</head>
<body>
<script>
var message = "Hello World!";
document.write(message.toUpperCase()+"</br>");//调用对象的方法
//申明对象
var person1 = new Object();
person1.firstname = "yoyo";
person1.lastname = "Xiao";
person1.age = 33;
person1.eyecolor = "black";
var person2 = { firstname: "dodo", lastname: "He", age: 45, eyecolor: "blue" };
document.write(person1.firstname + " " + person1.lastname + " is " + person1.age + " eyes are " + person1.eyecolor);
document.write(person2.firstname + " " + person2.lastname + " is " + person2.age + " eyes are " + person2.eyecolor);
</script>
</body>
</html>