美好的一天，首先我想说的是，我并不自豪地发布整个源代码。我无法将问题隔离在较小的 block 中。
这是文件的快照:
getRoomById : function( areaId, roomId ) {
if ( this.hAreas.get( areaId ) !== null && this.hAreas.get( areaId )[ roomId ] !== undefined )
{
//I can get here...
//alert( uneval( this.hAreas.get( areaId ) ) );
// returns: ({'000001':{areaId:"000001", roomId:"000001", Informations:{Name:"Room 1"}}, '000002':{areaId:"000001", roomId:"000002", Informations:{Name:"Room 2"}}, '000003':{areaId:"000001", roomId:"000003", Informations:{Name:"Room 3"}}})
//alert( roomId );
// returns: 000003
return this.hAreas.get( areaId )[ roomId ];
// returns: undefined
}
},
整个文件就在那里:http://jsfiddle.net/JSWCu/2/
问题:我有一个方法可以根据包含对象的 JS.Hash 测试参数。 if 希望返回 true，但是一旦进入，我就无法获取(警报或返回)该 JS.Hash 内的对象(返回未定义)。
谢谢!非常感谢您的帮助。我也希望得到避免此类错误的提示。
编辑:这是全部代码。对不起，它真的很大。它刚刚开始变得复杂，我(目前)无法将问题隔离到更小的代码片段中:
<html>
<head>
<style type="text/css">
</style>
<script type="text/javascript">
JSCLASS_PATH = 'http://www.poc.ca/cybrix/src';
function appendConsole( input ) {
document.getElementById( "console" ).innerHTML += input + "<br />";
}
</script>
<script type="text/javascript" src="http://www.poc.ca/cybrix/src/loader-browser.js"></script>
<script type="text/javascript">
JS.require('JS.Hash', 'JS.Observable', function() {
var AreaLists = {
"000001" : { "Name" : "Test Area", "Loaded" : false },
};
var World = new JS.Class({
hAreas : new JS.Hash([]),
getAreas : function( areaId ) {
if ( ! this.hAreas.get( areaId ) && AreaLists[ areaId ] !== undefined )
{
//TODO: Load from external sources
this.hAreas.put( areaId, {
"000001" : new Room( areaId, "000001", { "Name" : "Room 1" } ),
"000002" : new Room( areaId, "000002", { "Name" : "Room 2" } ),
"000003" : new Room( areaId, "000003", { "Name" : "Room 3" } ),
});
AreaLists[ areaId ].Loaded = true;
appendConsole( "Areas #" + areaId + " : " + AreaLists[ areaId ].Name + " Created" );
}
return this.hAreas.get( areaId );
},
getRoomById : function( areaId, roomId ) {
if ( this.hAreas.get( areaId ) !== null && this.hAreas.get( areaId )[ roomId ] !== undefined )
{
//I can get here...
//alert( uneval( this.hAreas.get( areaId ) ) );
// returns: ({'000001':{areaId:"000001", roomId:"000001", Informations:{Name:"Room 1"}}, '000002':{areaId:"000001", roomId:"000002", Informations:{Name:"Room 2"}}, '000003':{areaId:"000001", roomId:"000003", Informations:{Name:"Room 3"}}})
//alert( roomId );
// returns: 000003
return this.hAreas.get( areaId )[ roomId ];
// returns: undefined
}
},
reloadAreas : function( areaId ) {
//Triggered by Tick only if there is no players
},
addCharacter : function( areaId, roomId, character ) {
if ( this.hAreas.get( areaId ) && this.hAreas.get( areaId )[ roomId ] )
{
this.hAreas.get( areaId )[ roomId ].addCharacter( character );
}
},
removeCharacter : function( areaId, roomId, character ) {
return this.hAreas.get( areaId )[ roomId ].removeCharacter( character );
}
});
var Room = new JS.Class({
hDoors : new JS.Hash([]),
hExits : new JS.Hash([]),
hBodies : new JS.Hash([]),
hObjects : new JS.Hash([]),
initialize : function( areaId, roomId, Informations ) {
this.areaId = areaId;
this.roomId = roomId;
this.Informations = Informations;
//TODO: Load from external sources
if ( areaId == "000001" && roomId == "000003" )
{
this.hObjects.put("000001", new Objects("000001", { "Name" : "A table", "Type" : 0 }) );
this.hObjects.put("000002", new Objects("000002", { "Name" : "A water fountain", "Type" : 1 }) );
}
appendConsole( "Room: #" + this.areaId + "-" + this.roomId + " : " + this.Informations.Name + " Created" );
},
addCharacter : function( character ) {
this.hBodies.put( character.characterId , character );
character.onArriveRoom( this );
if ( ! character.Informations.Stealth )
{
//TODO: Broadcast Informations to others
appendConsole( character.Informations.Name + " has arrived to " + this.Informations.Name );
}
},
removeCharacter : function( character ) {
var characterId = ( typeof character == "object" ) ? character.characterId : character,
currentCharacter = this.hBodies.remove( characterId );
character.onLeaveRoom( this );
if ( currentCharacter !== null )
{
//TODO: Broadcast Informations to others
appendConsole( character.Informations.Name + " has left " + this.Informations.Name );
return currentCharacter;
}
return undefined;
},
onArrive : function() {
},
onLeave : function() {
},
getObjects : function( objectId, hash ) {
if ( this.hObjects.get( objectId ) )
{
var currentObjects = this.hObjects.get( objectId );
if ( hash )
{
return new JS.Hash([
currentObjects.objectId, currentObjects
]);
}
return currentObjects;
}
return this.hObjects;
},
toString : function( characterId ) {
}
});
var Objects = new JS.Class({
objectsTypes : {
0 : "lies",
1 : "stands"
},
initialize : function( objectId, Informations ) {
this.objectId = objectId;
this.Informations = Informations;
appendConsole( "Object: #" + this.objectId + " : " + this.Informations.Name + " Created" );
},
toString : function() {
return this.Informations.Name + " " + this.objectsTypes[ this.Informations.Type ] + " here.";
}
});
var Character = new JS.Class({
Pet : undefined,
initialize : function( characterId, Informations ) {
this.characterId = characterId;
this.Informations = Informations;
this.areaId = this.Informations.Zone.split("-")[ 0 ];
this.roomId = this.Informations.Zone.split("-")[ 1 ];
if ( this.Informations.Pet !== undefined )
{
//TODO: Load from external sources
if ( this.Informations.Pet === "000001" )
{
this.Pet = new Pet( "000001", { "Name" : "Molten Panther", "Zone" : this.areaId + "-" + this.roomId, "Stealth" : false } );
World.addCharacter( this.Pet.getArea() , this.Pet.getRoom() , this.Pet );
var petRoom = World.getRoomById( this.Pet.getArea() , this.Pet.getRoom() );
alert( petRoom ); // = undefined ????
}
}
appendConsole( "Character: #" + this.characterId + " : " + this.Informations.Name + " Created" );
},
onArriveRoom : function ( currentRoom ) {
},
onLeaveRoom : function( currentRoom ) {
},
onArrive : function() {
},
onLeave : function() {
},
getRoom : function() {
return this.roomId + "";
},
getArea : function() {
return this.areaId + "";
},
getInformations : function() {
return this.Informations;
},
hasPet : function() {
return ( typeof this.Pet == "object" );
},
getPet : function() {
return this.Pet;
},
equals : function( character ) {
return ( character instanceof this.klass ) && character.Informations.Name === this.Informations.Name;
}
});
var Pet = new JS.Class( Character, {
initialize : function( characterId, Informations ) {
this.callSuper();
appendConsole( "Pet: " + this.Informations.Name + " Created" );
}
});
//Tests
var World = new World();
var AreaOne = World.getAreas( "000001" );
var Cybrix = new Character( "000001", { "Name" : "Cybrix", "Zone" : "000001-000003", "Stealth" : false, "Pet" : "000001" } );
if ( World.getAreas( Cybrix.getArea() ) )
{
World.addCharacter( Cybrix.getArea() , Cybrix.getRoom() , Cybrix );
//Cybrix = World.removeCharacter( Cybrix.getArea() , Cybrix.getRoom() , Cybrix );
}
});
</script>
</head>
<body style="margin: 0; padding: 0;">
<div id="console" style="display: block; background-color: #000; height: 100%; color: #FFF; font-family: Lucida Console;"></div>
</body>
</html>
最佳答案
我一直在 jsfiddle 上玩你的例子，我遇到了一些相当奇怪的行为。在您的 Character 类的 initialization 方法中，您调用相关的 World.getRoomById() 方法并将其分配给名为 的变量>宠物室。
就您的代码而言，当您alert(petRoom)时，您确实会得到undefined。但是，如果您alert(petRoom.roomId)，您会按预期得到000003，所以我猜测它并没有真正返回true未定义的值。如果您将 petRoom 登录到 chrome 的控制台，它会将其归类为构造函数而不是对象。我不太确定那里发生了什么，但我认为这会提供一些额外的方向。我会继续玩......
更新:问题是您重写了 Room 类的 toString() 方法并且不返回任何内容。默认情况下，警报会使用对象的 toString() 方法将其转换为字符串，因为您已经覆盖了该方法并且没有返回未定义的值。
var Room = new JS.class({
...
snip
....
toString: function(characterId) {
}
});
关于javascript - 为什么这个 "if"通过了，但实际上它不应该通过？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6392641/