摘自 ----<<基於MVC 的Javascript Web 富應用開發>>
// 首先聲明Object.create()
if(typeof Object.create!="function"){
Object.create=function(o){
var F=function(){};
F.prototype=o;
return new F();
}
}
//定義對象的複製
Object.prototype.Clone=function(){
var objClone;
if (this.constructor == Object){
objClone = new this.constructor();
}else{
objClone = new this.constructor(this.valueOf());
}
for(var key in this){
if ( objClone[key] != this[key] ){
if ( typeof(this[key]) == 'object' ){
objClone[key] = this[key].Clone();
}else{
objClone[key] = this[key];
}
}
}
objClone.toString = this.toString;
objClone.valueOf = this.valueOf;
return objClone;
}
var Model={
inherited:function(){},
created:function(){
},
prototype:{
},
create:function(){//返回整個對象
//首先創建一個實例，繼承this的所有屬性
var object=Object.create(this);
//在實例的parent屬性中，說明用this賦值
object.parent=this;
//在實例的prototype屬性中，說明，繼承自this的prototype屬性
object.prototype=object.fn=Object.create(this.prototype);
//每次創建一個新的類，都要重新創建一個存儲緩存數據的對象空間
object.created();
this.inherited(object);
return object;
},
init:function(){ //返回對象的prototype屬性對象,並調用prototype屬性對象的init方法
//創建一個實例，繼承自this的prototype屬性
var instance=Object.create(this.prototype);
//在實例的parent屬性，賦值this
instance.parent=this;
//調用實例的init方法，傳入當前上下文的環境,以及輸入參數
instance.init.apply(instance,arguments);
return instance;
},
extend:function(o){//在對象的基礎上擴展屬性
var extended=o.extended;
jQuery.extend(this,o);
if(extended) extended(this);
},
include:function(o){//在對象的prototype屬性的基礎上擴展屬性
var included=o.included;
jQuery.extend(this.prototype,o);
if(included) included(this.prototype);
},
}
//緩存對象的空間
Model.include({
newRecord:true,
create:function(){
this.newRecord=false;
this.parent.records[this.id]=this.Clone();
},
update:function(){
this.parent.records[this.id]=this.Clone();
},
destroy:function(){
delete this.parent.records[this.id];
},
save:function(){
this.newRecord ? this.create() : this.update();
}
});
Model.extend({
//通過ID查找，找不到拋出異常
find:function(id){
return this.records[id].Clone()||null;
}
});
Model.extend({
created:function(){
this.records=[];
this.attributes=[];
}
});
//序列化模型屬性,返回所有屬性值，鍵值對
Model.include({
attributes:function(){
var result={};
for(var i in this.parent.attributes){
var attr=this.parent.attributes[i];
result[attr]=this[attr];
}
result.id=this.id;
return result;
}
});
Model.include({
init:function(attributes){
if(attributes){
for(var name in attributes){
this[name]=attributes[name];
}
this.id=Math.uuid();
};
}
});
/*!
Math.uuid.js (v1.4)
http://www.broofa.com
mailto:[email protected]
Copyright (c) 2010 Robert Kieffer
Dual licensed under the MIT and GPL licenses.
*/
/*
* Generate a random uuid.
*
* USAGE: Math.uuid(length, radix)
* length - the desired number of characters,字符長度
* radix - the number of allowable values for each character.二進制，十進制
*
* EXAMPLES:
* // No arguments - returns RFC4122, version 4 ID
* >>> Math.uuid()
* "92329D39-6F5C-4520-ABFC-AAB64544E172"
*
* // One argument - returns ID of the specified length
* >>> Math.uuid(15) // 15 character ID (default base=62)
* "VcydxgltxrVZSTV"
*
* // Two arguments - returns ID of the specified length, and radix. (Radix must be <= 62)
* >>> Math.uuid(8, 2) // 8 character ID (base=2)
* "01001010"
* >>> Math.uuid(8, 10) // 8 character ID (base=10)
* "47473046"
* >>> Math.uuid(8, 16) // 8 character ID (base=16)
* "098F4D35"
*/
(function() {
// Private array of chars to use
var CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
Math.uuid = function (len, radix) {
var chars = CHARS, uuid = [], i;
radix = radix || chars.length;
if (len) {
// Compact form
for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random()*radix];
} else {
// rfc4122, version 4 form
var r;
// rfc4122 requires these characters
uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
uuid[14] = '4';
// Fill in random data. At i==19 set the high bits of clock sequence as
// per rfc4122, sec. 4.1.5
for (i = 0; i < 36; i++) {
if (!uuid[i]) {
r = 0 | Math.random()*16;
uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
}
}
}
return uuid.join('');
};
// A more performant, but slightly bulkier, RFC4122v4 solution. We boost performance
// by minimizing calls to random()
Math.uuidFast = function() {
var chars = CHARS, uuid = new Array(36), rnd=0, r;
for (var i = 0; i < 36; i++) {
if (i==8 || i==13 || i==18 || i==23) {
uuid[i] = '-';
} else if (i==14) {
uuid[i] = '4';
} else {
if (rnd <= 0x02) rnd = 0x2000000 + (Math.random()*0x1000000)|0;
r = rnd & 0xf;
rnd = rnd >> 4;
uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
}
}
return uuid.join('');
};
// A more compact, but less performant, RFC4122v4 solution:
Math.uuidCompact = function() {
return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
return v.toString(16);
});
};
})();