AS3数组学习
indexOf lastIndexOf
返回索引，查找不到返回-1
var arr:Array = ["a","b","c","d","e","f","g"];
arr.indexOf("e");
arr.indexOf("b",2);//从第3个元素开始查找
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
var arr:Array = ["a","b","c","d","e","f","g"];
arr.push("h");//在数组尾部插入元素h
arr.push("i","j","k");//在数组尾部插入多个元素
arr.unshift("h");//在数组头部插入元素h
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
var arr:Array = ["a","b","c","d","e","f","g"]; arr.pop();//删除尾元素 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
var arr:Array = ["a","b","c","d","e","f","g"]; arr.splice(删除点的索引,要删除的个数,新元素1,新元素2); 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" 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" arr.splice(2,3);//单纯的删除从索引2开始的3个元素(不插入) arr.splice(2);//单纯的删除从索引2开始的所有元素(不插入) 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
var arr:Array = ["a","b","c","d","e","f","g"]; var newArr:Array = arr.slice();//浅复制数组 var newArr:Array = arr.slice(2); var newArr:Array = arr.slice(-2); var newArr:Array = arr.slice(2,5);
concat
将多个元素或数组拼接成一个新数组
var arr:Array = ["a","b","c","d","e","f","g"];
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
var newArr = arr.concat();//浅复制数组reverse
将数组倒序排列
var arr:Array = ["a","b","c"]; 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
var arr:Array = ["b","c","a"];
trace(arr.sort());//得到a,b,c
arr = ["210","1111","30"];
trace(arr.sort());//得到1111,210,30
arr = ["b","X","A","c"];
trace(arr.sort());//得到A,X,b,c
arr = ["b","C",235,"a",38,"X",8641];
trace(arr.sort());//得到235,38,8641,C,X,a,b
trace(arr.sort());//得到a,b,c
arr = ["210","1111","30"];
trace(arr.sort());//得到1111,210,30
arr = ["b","X","A","c"];
trace(arr.sort());//得到A,X,b,c
arr = ["b","C",235,"a",38,"X",8641];
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)
1. sort(Array.CASEINSENSITIVE) 同sort(),不过不区分大小写,数字也是按字符串来处理
var arr = ["b","X","A","c"]; arr.sort(Array.CASEINSENSITIVE);//得到"A","b","c","X"
2. 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
var arr:Array = ["b","C","a","X",235,8641,38]; trace(arr.sort(Array.DESCENDING));//得到b,a,X,C,8641,38,235
3. sort(Array.UNIQUESORT) 同sort(),如果数组有相同元素，则放弃排序，返回0
var arr:Array = ["b","C","a","X",235,8641,38,2365];
if(arr.sort(Array.UNIQUESORT)=="0")
{
trace("有相同元素");
}
else
{
trace("没有相同元素");
}4. sort(Array.RETURNINDEXEDARRAY) 同sort(),返回排序后的索引列表，原数组不变
var arr:Array = ["b","C","a","X",235,8641,38,2365]; trace(arr.sort(Array.RETURNINDEXEDARRAY));//得到4,7,6,5,1,3,2,0 trace(arr);//得到b,C,a,X,235,8641,38,2365(原数组)
5. 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
var arr:Array = [235,8641,38,2365]; 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
public function Sample1008()
{
var objA:Object = {price:200,quantity:2};
var objB:Object = {price:400,quantity:4};
var objC:Object = {price:100,quantity:1};
var arr:Array = [objA,objB,objC];
trace("原数组是：");
for(var i:int=0;i<arr.length;i++)
{
trace(arr[i].price);
}
arr.sort(Compare);
trace("排序后的数组是：");
for(var j:int=0;j<arr.length;j++)
{
trace(arr[j].price);
}
}
private function Compare(paraA:Object,paraB:Object):int
{
var totalPriceA:int = paraA.price * paraA.quantity;
var totalPriceB:int = paraB.price * paraB.quantity;
if(totalPriceA>totalPriceB)
{
return 1;
}
else if(totalPriceA<totalPriceB)
{
return -1;
}
else
{
return 0;
}
}
/*运行结果是
原数组是：
200
400
100
排序后的数组是：
100
200
400*/sortOn
常用于对象数组的排序
var obj1:MyClass = new MyClass();
var obj2:MyClass = new MyClass();
var obj3:MyClass = new MyClass();
obj1.orderID = 300;
obj2.orderID = 100;
obj3.orderID = 200;
var arr:Array = [obj1,obj2,obj3];
//trace(arr.sortOn("orderID"));
trace(arr.sortOn("orderID",Array.RETURNINDEXEDARRAY));//得到索引1,2,0every
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
public function Sample1008()
{
//必须5个人都满70级，才可以进副本
var player1:Object = {name:"wayne",level:70};
var player2:Object = {name:"tom",level:69};
var player3:Object = {name:"jacky",level:70};
var player4:Object = {name:"andy",level:68};
var player5:Object = {name:"bill",level:70};
var playerList:Array = [player1,player2,player3,player4,player5];
if(!playerList.every(CheckLevel))
{
trace("队伍中有人等级未到70，无法进入副本");
}
}
private function CheckLevel(item:*,index:int,arr:Array):Boolean
{
if(item.level<70)
{
//trace(item.name+"等级未到70,无法进入副本");
return false;
}
return true;
}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)
public function Sample1008()
{
var player1:Object = {name:"wayne",level:70};
var player2:Object = {name:"tom",level:69};
var player3:Object = {name:"jacky",level:70};
var player4:Object = {name:"andy",level:68};
var player5:Object = {name:"bill",level:70};
var playerList:Array = [player1,player2,player3,player4,player5];
for(var i:int = 0; i<playerList.length; i++)
{
trace("player"+(i+1)+"的所有属性是:");
for(var attr:String in playerList[i])
{
trace(attr+":"+playerList[i][attr]);
}
}
//为每个玩家添加新属性"声望值"
var newArray:Array = playerList.map(AddNewAttribute);
trace("-----------------Map后的结果-----------------");
for(var j:int = 0; j<newArray.length; j++)
{
trace("player"+(j+1)+"的所有属性是:");
for(var attr2:String in newArray[j])
{
trace(attr2+":"+newArray[j][attr2]);
}
}
}
private function AddNewAttribute(item:*,index:int,arr:Array):Object
{
var tmpPlayer:Object = {};
tmpPlayer.name = item.name;
tmpPlayer.level = item.level;
tmpPlayer.repute = 99;
return tmpPlayer;
}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
public function Sample1008()
{
//只要队伍里有一个人声望达到140以上，则全队可以进副本
var player1:Object = {name:"wayne",level:70,repute:100};
var player2:Object = {name:"tom",level:70,repute:190};
var player3:Object = {name:"jacky",level:70,repute:50};
var player4:Object = {name:"andy",level:70,repute:230};
var player5:Object = {name:"bill",level:70,repute:120};
var playerList:Array = [player1,player2,player3,player4,player5];
if(playerList.some(CheckRepute))
{
trace("可以进入副本");
}
else
{
trace("队伍里没有成员声望达到140，无法进入副本");
}
}
private function CheckRepute(item:*,index:int,arr:Array):Boolean
{
if(item.repute>=140)
{
return true;
}
return false;
}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
public function Sample1008()
{
//得到队伍里所有声望达到要求的成员
var player1:Object = {name:"wayne",level:70,repute:100};
var player2:Object = {name:"tom",level:70,repute:190};
var player3:Object = {name:"jacky",level:70,repute:50};
var player4:Object = {name:"andy",level:70,repute:230};
var player5:Object = {name:"bill",level:70,repute:120};
var playerList:Array = [player1,player2,player3,player4,player5];
var newArray:Array = playerList.filter(CheckRepute);
for(var i:int=0; i<newArray.length; i++)
{
for(var attr:String in newArray[i])
{
trace(attr+":"+newArray[i][attr]);
}
}
}
private function CheckRepute(item:*,index:int,arr:Array):Boolean
{
if(item.repute>=140)
{
return true;
}
return false;
}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)
public function Sample1008()
{
//在每个玩家名字前面加上公会名称
var player1:Object = {name:"wayne",level:70,repute:100};
var player2:Object = {name:"tom",level:70,repute:190};
var player3:Object = {name:"jacky",level:70,repute:50};
var player4:Object = {name:"andy",level:70,repute:230};
var player5:Object = {name:"bill",level:70,repute:120};
var playerList:Array = [player1,player2,player3,player4,player5];
playerList.forEach(BuildName);
for(var i:int=0; i<playerList.length; i++)
{
for(var attr:String in playerList[i])
{
trace(attr+":"+playerList[i][attr]);
}
}
}
private function BuildName(item:*,index:int,arr:Array):void
{
item.name = "暗界--"+item.name;
}
