<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body style="background: rgba(199,237,204,1)">
<pre id="container">
</pre>
<pre>
</pre>
</body>
<script type="text/javascript">
function print(txt) {
document.getElementById("container").innerHTML += ('\n') + txt;
}
document.body.onclick = function () {
window.location.reload()
}
console.log = print;
console.log("面向对象的程序设计")
eval('for(var i in [0,1,2]){print(i);}');
var person = {};
Object.defineProperty(person, "name", {
writable: false,
configurable: false,
value: "xiaoming"
});
print(person.name)//xiaoming
person.name = "小李";
print(person.name)//xiaoming
delete person.name
print(person.name)//xiaoming
function Person(name, age) {
this.name = name;
this.age = age;
//每一个Person对象独有一个sayName函数
this.sayName = function () {
return this.name;
}
}
//所有Person的对象公用同一个sayAge函数
Person.prototype.sayAge = function () {
return this.age;
};
var p1 = new Person("xm", 10);
var p2 = new Person('小李', 12);
print(p1.sayName())//xm
print(p2.sayName())// 小李
print(p1.sayAge())//10
print(p2.sayAge())// 12
print(p1.constructor == Person)//true
print(p2.constructor == Person)//true
print(p1 instanceof Person)//true
print(p1.sayName == p2.sayName)//false
print(p1.sayAge == p2.sayAge)//true
p1.sayAge = function () {
return 'my age is ' + this.age;
};
print(p1.sayAge());//my age is 10
delete p1.sayAge;
print(p1.sayAge());//10
Person("小红", 13);
print(window.sayName());//小红
print(p1.hasOwnProperty('sayAge'))//false
p1.sayAge = function () {
}
print(p1.hasOwnProperty('sayAge'))//true
print("sayAge" in p1)//true
for (var prop in p1) {
// name
// age
// sayName
// sayAge
print(prop)
}
print('.......')
print(Object.keys(Person.prototype))//sayAge
print(Object.keys(p1))//name,age,sayName,sayAge
</script>
</html>
面向对象的程序设计
0
1
2
xiaoming
xiaoming
xiaoming
xm
小李
10
12
true
true
true
false
true
my age is 10
10
小红
false
true
true
name
age
sayName
sayAge
.......
sayAge
name,age,sayName,sayAge
