[js] prototype chain
最近在看本书 pro javascript，受益匪浅。
在看closure这章的时候，作者推荐 http://jibbering.com/faq/faq_notes/closures.html 这篇文章。
很不错的一篇文章，很深入，所以看得很慢。看到有段代码有点意思，是关于prototype chain的：
1
/* A "constructor" function for creating objects of a -
2
MyObject1 - type.
3
*/
4function MyObject1(formalParameter){
5
/* Give the constructed object a property called - testNumber - and
6 assign it the value passed to the constructor as its first
7 argument:-
8
*/
9 this.testNumber = formalParameter;
10}
11
12/* A "constructor" function for creating objects of a -
13 MyObject2 - type:-
14*/
15function MyObject2(formalParameter){
16 /* Give the constructed object a property called - testString -
17 and assign it the value passed to the constructor as its first
18 argument:-
19 */
20 this.testString = formalParameter;
21}
22
23/* The next operation replaces the default prototype associated with
24 all MyObject2 instances with an instance of MyObject1, passing the
25 argument - 8 - to the MyObject1 constructor so that its -
26 testNumber - property will be set to that value:-
27*/
28MyObject2.prototype = new MyObject1( 8 );
29
30/* Finally, create an instance of - MyObject2 - and assign a reference
31 to that object to the variable - objectRef - passing a string as the
32 first argument for the constructor:-
33*/
34
35var objectRef = new MyObject2( "String_Value" );
36
/* A "constructor" function for creating objects of a -
2
MyObject1 - type.3
*/4
function MyObject1(formalParameter){
5
/* Give the constructed object a property called - testNumber - and
6
assign it the value passed to the constructor as its first7
argument:-8
*/9
this.testNumber = formalParameter;10
}11
12
/* A "constructor" function for creating objects of a -13
MyObject2 - type:-14
*/15
function MyObject2(formalParameter){16
/* Give the constructed object a property called - testString -17
and assign it the value passed to the constructor as its first18
argument:-19
*/20
this.testString = formalParameter;21
}22
23
/* The next operation replaces the default prototype associated with24
all MyObject2 instances with an instance of MyObject1, passing the25
argument - 8 - to the MyObject1 constructor so that its -26
testNumber - property will be set to that value:-27
*/28
MyObject2.prototype = new MyObject1( 8 );29
30
/* Finally, create an instance of - MyObject2 - and assign a reference31
to that object to the variable - objectRef - passing a string as the32
first argument for the constructor:-33
*/34
35
var objectRef = new MyObject2( "String_Value" );36
