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216 changes: 216 additions & 0 deletions JavaScript电子书/[JavaScript权威指南(第6版)]/js学习.txt
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js

һ���ʷ��ṹ
1�����ִ�Сд
2��ע�� // ���� /* ����ע�� */
3��������(ֱ���� literal)
12 //����
5.8 // ��
"hello"
'hello'
true
/js/gi //����
null //��
{x:1,y:2}
[1,2,3,4]
4����ʾ��(����)�ͱ�����
5���ֺſ���ʡ�Ե��ǿ��ܻ�������⣬js���Զ���;
var y = x+f
(a+b).toString()
�ȼ���
var y = x+f(a+b).toString();
�������͡�ֵ�ͱ���
1��ԭʼ���� ���֡��ַ����Ͳ��� null�� undefinedδ����
2����������
3���� Array Function Date RegExp Error
4��js������ �������������
5������js��ֵ������תΪ����ֵ
undefined
null
0
-0
NaN
"" ����ת��Ϊfalse
6����װ����
var s= "hello"; //ԭʼ���� ��û�з�����
s.len = 4; //������ԭʼ���͵����Ի򷽷���ʱ��ԭʼ������û�����Ժͷ����ģ�
//ֻҪ�������ַ��������Ի򷽷����ͻ����new String(s)��ԭʼ���ͣ���װ�ɶ���
//�Ժ����s.len �ǵ���String��������Ժͷ�����һ�����ý������´�������ʱ���������
var n = s.len; //��ʱΪundefined
alert(n);

//�����ַ��� ���� ���ֵ����Ի򷽷�ʱ����������ʱ�����ǰ�װ����
��ʾ�����װ���� var S = new String("hello")
var s = "hello"; �Dz�ͬ��
7��==��===
8������ת��
var n = 17;
alert(n.toString(2)); //������ 10001
alert(n.toString(8)); // 021
alert(n.toString(16)); // 0x21
alert(n.toString(10)); alert(n.toString());
9��toString() valueOf()
var date = new Date(2011,1,3);
date.valueOf() ���غ�����������ʱ��
10��js�Ƕ�̬���� var n = 10; ���������ڼ� �Ż�ȷ������������
11������������
�����������������ǰ
�����ڶ���ı��� �����Զ���ǰ����������
12����������scope chain
�ڲ����������ĺ������ڣ������������������󣬵�һ���Ƕ��庯��
�����;ֲ������Ķ��󣬵ڶ�����ȫ�ֶ���
��һ��Ƕ�׺������ڣ�������������������������

����һ������ʱ����������һ���������������ú���ʱ��������һ��
�µĶ���洢���ľֲ���������������������ӵ�������Ǹ���������
�ϣ�ͬʱ����һ���µĸ����ı�ʾ��������������ġ�����������Ƕ�׺���
ÿ�ε����ⲿ����ʱ���ڲ����������¶���һ�顣ÿ�ε����ⲿ������ʱ��
���������Dz�ͬ�ġ�
13��delete in eval void

������ ���

������ ����
1������Ļ������� create set query delete test enumerate
2��������������� ��д ��ö�� �����ã��Ƿ��ɾ����
3������Ķ�������
�����ԭ�� prototype
������� ��ʾ�������͵��ַ���
�������չ��� �Ƿ������������
//������������ַ���
4������ֱ����
var empty = {};
var point = {x:0,y:0};
5��new��������
var o = new Object(); //�ն��� ��{}һ��
var a = new Array();
6��Object.create()
var o1 = Object.create({x:1,y:2}); //o1 �̳��Զ���ԭ��{x:1,y:2}
var o2 = Object.create(null); //o2���̳��κ����Ժͷ���
var o3 = Object.create(Object.prototype);
//�ն���� {} new Object()һ��
7�����ԵIJ��� ��Ϊ��������Ķ���
object.property
object["property"] ɢ�� ӳ�� �ֵ� ��������
8���̳�
js�ļ̳�ֻ�ܴӸ����ȡ���Ե�ֵ���������޸�ԭ����
�������bookΪnull��undefined
book.subtitle.length�ᱨ��
�������
var len = book && book.subtitle && book.subtitle.length;

ɾ������
delete book.subtitle

������� in hasOwnPreperty() propertyIsEnumerable()
var o = {x:1};
"x" in o
"toString" in o

hasOwnPreperty();�ж������Ƿ����Լ��ġ��̳����Է���false

propertyIsEnumerable() ֻ�����������ԣ�����ö��


��ȡ��������
Object.keys()
Object.getOwnPropertyNames()
9������getter��setter
var o = {
x: 0,
y: 1,
set r(value) { value = this.r;},
get r() { return this.x + this.y;}
};
x�������ԣ�r��ȡ������
10�����Ե����� ecmascript5 �ϵ�ie��֧�������÷�
�������Ե����ԣ�ֵvalue ��д��writable
��ö��enumerable
������configurable
��ȡ���������ԣ�get set
��ö��enumerable
������configurable
//����{value:1,writable:true,emunerable:true,configurable:true}
Object.getOwnPropertyDescriptor({x:1},x)
//�鲻������ ����undefined

�������Ե����� �����޸ļ̳е���������
Object.defineProperty()
//���ò���ö������
var o = {};
Object.defineProperty(o,"x",{
value:1,
writable:true,
emunerable:false,
configurable:true
})

//����ֻ��
Object.defineProperty(o,"x",{writable:false})

�޸Ķ����������
Object.defineProperties()

��չObject.prototype �� P137
11���������������
prototype class extensible attribute

��ѯ�����ԭ��
ecmascript5�� Object.getPrototypeOf(o1)
ecmascript3�� o1.constructor.prototype

ͨ������ֱ������new Object()��ʽ�����Ķ���
����һ��constructor�����ԣ�ָObject()�Ĺ��캯��
constructor.prototype����������ԭ��

p.isPrototypeOf(o)������p�Ƿ���o��ԭ��


//��ȡ��������� �ַ���
Object.prototype.toString.call(o1).slice(8,-1)
12������Ŀ���չ��
�����Ƿ�����¼�����
Object.preventExtensions() ���ö��󲻿���չ
Object.isExtensible()
Object.seal() ���˽���������Ϊ������չ��������������Ϊ��������
Object.freeze()
���˽���������Ϊ������չ������������Ϊ�������ã�������������Ϊֻ��

��8�� ����
1�����������������
function t(){ }
t(); �������� this��ȫ�ֶ��� �ϸ�ģʽ����undefined

var o = {a:function(){}};
o.a() �������� this�ǵ�ǰ���õĶ���
2�����캯������
var o = new Object(); var o= new Object;
o�̳��Թ��캯����prototype���� �ڲ���this�Ǵ˶���

var r = new o.m();�е�this����o
3��P184 ������ִ���õ�������������������������Ǻ��������ʱ�򴴽��ġ�
Ƕ�׵ĺ���f()���������������������еı���scope�Ǿֲ�����


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Ȼ�󽫺���t�ĵ��ö���������֮�������ȫ�ֶ���Ȼ���������ͷѰ�ұ���name

����ss() ss() ==> t() ==> window
name="lwy";
function t(){
var name="tlwy";
function s(){
var name="slwy";
console.log(name);
}
function ss(){
console.log(name);
}
s();
ss();
}
t();

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