AS3数组学习

indexOf  lastIndexOf

返回索引，查找不到返回-1

1. var arr:Array = ["a","b","c","d","e","f","g"];
3. arr.indexOf("e");
5. arr.indexOf("b",2); //从第3个元素开始查找
7. arr.lastIndexOf("b",2); //从第3个元素反向查找

push  unshift

在首尾插入元素，返回增加元素后数组的长度

1. var arr:Array = ["a","b","c","d","e","f","g"];
3. arr.push("h"); //在数组尾部插入元素h
5. arr.push("i","j","k"); //在数组尾部插入多个元素
7. arr.unshift("h"); //在数组头部插入元素h
9. arr.unshift("i","j","k"); //在数组头部插入多个元素

pop  shift

删除首尾元素，返回被删除的元素

1. var arr:Array = ["a","b","c","d","e","f","g"];
3. arr.pop(); //删除尾元素
5. arr.shift(); //删除首元素 

splice

删除数组一段连续的元素，返回被删除的元素数组

1. var arr:Array = ["a","b","c","d","e","f","g"];
3. arr.splice(删除点的索引,要删除的个数,新元素1,新元素2);
5. arr.splice(2,3,"o","p","q"); //从索引为2开始，删除3个元素，并插入3个新元素"o","p","q"
7. arr.splice(-2,3,"o","p","q"); //从倒数为2的索引开始，删除3个元素，并插入3个新元素"o","p","q"
9. arr.splice(2,3); //单纯的删除从索引2开始的3个元素(不插入)
11. arr.splice(2); //单纯的删除从索引2开始的所有元素(不插入)
13. arr.splice(2,0,"x","y","z"); //在索引2的后面插入3个新元素(不删除)

slice

获取数组中的部分元素

1. var arr:Array = ["a","b","c","d","e","f","g"];
3. var newArr:Array = arr.slice(); //浅复制数组
5. var newArr:Array = arr.slice(2);
7. var newArr:Array = arr.slice(-2);
9. var newArr:Array = arr.slice(2,5); 

concat

将多个元素或数组拼接成一个新数组

1. var arr:Array = ["a","b","c","d","e","f","g"];
3. var newArr = arr.concat("x","y","z"); //原数组不变，新数组是原数组拼接后的结果
5. var newArr = arr.concat(); //浅复制数组 

reverse

将数组倒序排列

1. var arr:Array = ["a","b","c"];
3. arr.reverse(); //得到"c","b","a" 

sort

◆sort() 按默认排序,注意：区分大小写,数字也是按字符串来处理

1. var arr:Array = ["b","c","a"];
3. arr.sort(); //得到"a","b","c" arr = ["210","1111","30"];
5. arr.soft(); //得到"1111","210","30" arr = ["b","X","A","c"];
7. arr.sort(); //得到"A","X","b","c"
9. var arr:Array = ["b","C",235,"a",38,"X",8641];
11. trace(arr.sort()); //得到235,38,8641,C,X,a,b 

◆sort(args) 按参数排序,一共有5种(注意：除了Array.RETURNINDEXEDARRAY,其它方式只要排序成功，都会实际改变数组)

 

        sort(Array.CASEINSENSITIVE) 同sort(),不过不区分大小写,数字也是按字符串来处理

1. var arr = ["b","X","A","c"];
3. arr.sort(Array.CASEINSENSITIVE); //得到"A","b","c","X" 

        sort(Array.DESCENDING) 按字符串的倒序排列,区分大小写,数字也是按字符串来处理

1. var arr:Array = ["b","C","a","X",235,8641,38];
3. trace(arr.sort(Array.DESCENDING)); //得到b,a,X,C,8641,38,235

        sort(Array.UNIQUESORT) 同sort(),如果数组有相同元素，则放弃排序，返回0

1. var arr:Array = ["b","C","a","X",235,8641,38,2365];
3. if(arr.sort(Array.UNIQUESORT)=="0")
4. { 
5.     trace("有相同元素");
6. }
7. else
8. { 
9.     trace("没有相同元素");
10. }

        sort(Array.RETURNINDEXEDARRAY) 同sort(),返回排序后的索引列表，原数组不变

1. var arr:Array = ["b","C","a","X",235,8641,38,2365];
3. trace(arr.sort(Array.RETURNINDEXEDARRAY)); //得到4,7,6,5,1,3,2,0
5. trace(arr); //得到b,C,a,X,235,8641,38,2365(原数组)

        sort(Array.NUMERIC) 按数字从小到大排序,如果数组里含有非数字，会抛出异常

1. var arr:Array = [235,8641,38,2365];
3. trace(arr.sort(Array.NUMERIC)); //得到38,235,2365,8641

◆sort(函数名) 按自定义函数比较,该函数必须接受2个参数，返回值为1、-1、0

1. public function Sample1008()
2. {
3.     var objA:Object = {price:200,quantity:2};
4.     var objB:Object = {price:400,quantity:4};
5.     var objC:Object = {price:100,quantity:1};
7.     var arr:Array = [objA,objB,objC];
8.     trace("原数组是：");
9.     for(var i:int=0;i<arr.length;i++)
10.     {
11.         trace(arr[i].price);
12.     }
13.     arr.sort(Compare);
14.     trace("排序后的数组是：");
15.     for(var j:int=0;j<arr.length;j++)
16.     {
17.         trace(arr[j].price);
18.     }
19. }
21. private function Compare(paraA:Object,paraB:Object):int
22. {
23.     var totalPriceA:int = paraA.price * paraA.quantity;
24.     var totalPriceB:int = paraB.price * paraB.quantity;
26.     if(totalPriceA>totalPriceB)
27.     {
28.         return 1;
29.     }
30.     else if(totalPriceA<totalPriceB)
31.     {
32.         return -1;
33.     }
34.     else
35.     {
36.         return 0;
37.     }
38. }
40. /*运行结果是
41. 原数组是：
42. 200
43. 400
44. 100
45. 排序后的数组是：
46. 100
47. 200
48. 400*/

sortOn

常用于对象数组的排序

1. var obj1:MyClass = new MyClass();
3. var obj2:MyClass = new MyClass();
5. var obj3:MyClass = new MyClass();
7. obj1.orderID = 300;
9. obj2.orderID = 100;
11. obj3.orderID = 200;
13. var arr:Array = [obj1,obj2,obj3];
15. //trace(arr.sortOn("orderID"));
17. trace(arr.sortOn("orderID",Array.RETURNINDEXEDARRAY)); //得到索引1,2,0 

every

判断数组里的每个元素是否满足某些条件，只有全部都满足才为true

1. public function Sample1008()
2. {
3.     //必须5个人都满70级，才可以进卡拉赞副本
4.     var player1:Object = {name:"wayne",level:70};
5.     var player2:Object = {name:"tom",level:69};
6.     var player3:Object = {name:"jacky",level:70};
7.     var player4:Object = {name:"andy",level:68};
8.     var player5:Object = {name:"bill",level:70};
9.     
10.     var playerList:Array = [player1,player2,player3,player4,player5];
11.     if(!playerList.every(CheckLevel))
12.     {
13.         trace("队伍中有人等级未到70，无法进入副本");
14.     }
15. }
17. private function CheckLevel(item:*,index:int,arr:Array):Boolean
18. {
19.     if(item.level<70)
20.     {
21.         //trace(item.name+"等级未到70,无法进入副本");
22.         return false;
23.     }
24.     return true;
25. }

map

映射器，逐个处理数组中的元素，最后生成一个修改后的新数组(不会更改原数组)

1. public function Sample1008()
2. {
3.     var player1:Object = {name:"wayne",level:70};
4.     var player2:Object = {name:"tom",level:69};
5.     var player3:Object = {name:"jacky",level:70};
6.     var player4:Object = {name:"andy",level:68};
7.     var player5:Object = {name:"bill",level:70};
8.     
9.     var playerList:Array = [player1,player2,player3,player4,player5];
10.     
11.     for(var i:int = 0; i<playerList.length; i++)
12.     {
13.         trace("player"+(i+1)+"的所有属性是:");
14.         for(var attr:String in playerList[i])
15.         {
16.             trace(attr+":"+playerList[i][attr]);
17.         }
18.     }
19.     
20.     //为每个玩家添加新属性"声望值"
21.     var newArray:Array = playerList.map(AddNewAttribute);
22.     
23.     trace("-----------------Map后的结果-----------------");
24.     
25.     for(var j:int = 0; j<newArray.length; j++)
26.     {
27.         trace("player"+(j+1)+"的所有属性是:");
28.         for(var attr2:String in newArray[j])
29.         {
30.             trace(attr2+":"+newArray[j][attr2]);
31.         }
32.     }
33. }
35. private function AddNewAttribute(item:*,index:int,arr:Array):Object
36. {
37.     var tmpPlayer:Object = {};
38.     tmpPlayer.name = item.name;
39.     tmpPlayer.level = item.level;
40.     tmpPlayer.repute = 99;
41.     return tmpPlayer;
42. }

some

判断数组里的每个元素是否满足某些条件，只要有一个满足就返回true

1. public function Sample1008()
2. {
3.     //主要队伍里有一个人声望达到140以上，则全队可以进副本
4.     var player1:Object = {name:"wayne",level:70,repute:100};
5.     var player2:Object = {name:"tom",level:70,repute:190};
6.     var player3:Object = {name:"jacky",level:70,repute:50};
7.     var player4:Object = {name:"andy",level:70,repute:230};
8.     var player5:Object = {name:"bill",level:70,repute:120};
9.     
10.     var playerList:Array = [player1,player2,player3,player4,player5];
11.     
12.     if(playerList.some(CheckRepute))
13.     {
14.         trace("可以进入副本");
15.     }
16.     else
17.     {
18.         trace("队伍里没有成员声望达到140，无法进入副本");
19.     }
20. }
22. private function CheckRepute(item:*,index:int,arr:Array):Boolean
23. {
24.     if(item.repute>=140)
25.     {
26.         return true;
27.     }
28.     return false;
29. }

filter

将数组里满足特定条件的元素提取出来，生成一个新数组

1. public function Sample1008()
2. {
3.     //得到队伍里所有声望达到要求的成员
4.     var player1:Object = {name:"wayne",level:70,repute:100};
5.     var player2:Object = {name:"tom",level:70,repute:190};
6.     var player3:Object = {name:"jacky",level:70,repute:50};
7.     var player4:Object = {name:"andy",level:70,repute:230};
8.     var player5:Object = {name:"bill",level:70,repute:120};
9.     
10.     var playerList:Array = [player1,player2,player3,player4,player5];
11.     
12.     var newArray:Array = playerList.filter(CheckRepute);
13.     
14.     for(var i:int=0; i<newArray.length; i++)
15.     {
16.         for(var attr:String in newArray[i])
17.         {
18.             trace(attr+":"+newArray[i][attr]);
19.         }
20.     }
21. }
23. private function CheckRepute(item:*,index:int,arr:Array):Boolean
24. {
25.     if(item.repute>=140)
26.     {
27.         return true;
28.     }
29.     return false;
30. }

forEach

对数组里的元素逐个进行操作，实际改变了数组(不同于map)

1. public function Sample1008()
2. {
3.     //在每个玩家名字前面加上公会名称
4.     var player1:Object = {name:"wayne",level:70,repute:100};
5.     var player2:Object = {name:"tom",level:70,repute:190};
6.     var player3:Object = {name:"jacky",level:70,repute:50};
7.     var player4:Object = {name:"andy",level:70,repute:230};
8.     var player5:Object = {name:"bill",level:70,repute:120};
9.     
10.     var playerList:Array = [player1,player2,player3,player4,player5];
11.     
12.     playerList.forEach(BuildName);
13.     
14.     for(var i:int=0; i<playerList.length; i++)
15.     {
16.         for(var attr:String in playerList[i])
17.         {
18.             trace(attr+":"+playerList[i][attr]);
19.         }
20.     }
21. }
23. private function BuildName(item:*,index:int,arr:Array):void
24. {
25.     item.name = "暗界--"+item.name;
26. }