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JavaScript高級程序設計：本地對象Array
創建Array對象
復制代碼 代碼如下:
//one
var aValues=new Array();
//two
var aValues=new Array(20);
//three
var aColors=new Array();
aColors[0]="red";
aColors[1]="green";
aColors[2]="blue";
//four
var aColors=new Array("red","green","blue");
//five
var aColors=["red","green","blue"];
join && split
join:連接字符串
復制代碼 代碼如下:
var aColors=["red","green","blue"];
alert(aColors.join(","));//outputs "red,green,blue"
alert(aColors.join("-spring-"));//outputs "red-spring-green-spring-blue"
alert(aColors.join("]["));//outputs "red][green][blue"
split:分拆字符串
復制代碼 代碼如下:
var sColors="red,green,blue";
var aColors=sColors.split(",");//outputs ["red", "green", "blue"]
var redColors=aColors[0].split("");//outputs ["r", "e", "d"]
concat && slice
concat:追加數組
復制代碼 代碼如下:
var aColors=["red","green","blue"];
var aColors2=aColors.concat("yellow","purple");
alert(aColors);//outputs ["red", "green", "blue"]
alert(aColors2);//outputs ["red", "green", "blue", "yellow", "purple"]
slice:返回具有特定項的新數組
復制代碼 代碼如下:
var aColors=["red","green","blue","yellow","purple"];
var aColors2=aColors.slice(1);//outputs ["green","blue","yellow","purple"]
var aColors3=aColors.slice(1,4);//outputs ["green","blue","yellow"]
push && pop
跟棧一樣，Array提供了push和pop方法，push方法用于在Array結尾添加一個或多個項，pop用于刪除最后一個數組項，返回它作為函數值
復制代碼 代碼如下:
var stack=new Array;
stack.push("red");
stack.push("green");
stack.push("blue");
alert(stack);//outputs ["red","green","blue"]
var vItem=stack.pop();
alert(vItem);//outputs ["blue"]
alert(stack);//otputs ["red","green"]
shift && unshift
shift:刪除數組中第一項，將其作為函數返回值，unshift:把一個項放在數組的第一個位置，然后把余下的項向下移動一個位置
復制代碼 代碼如下:
var aColors=["red","green","blue"];
var vItem=aColors.shift();
alert(aColors);//outputs ["green","blue"]
alert(vItem);//outputs ["red"]
aColors.unshift("black");
alert(aColors);//outputs ["black","green","blue"]
reverse && sort
reverse:顛倒數組項的順序，sort:按數組項的值升序排列(首先要調用toString()方法，將所有值轉換成字符串)
復制代碼 代碼如下:
var aColors=["blue","green","red"];
aColors.reverse();
alert(aColors);//outputs ["red","green","blue"]
aColors.sort();
alert(aColors);//outputs ["blue","green","red"]
注意：
復制代碼 代碼如下:
var aColors=[3,32,2,5];
aColors.sort();
alert(aColors);//outputs [2,3,32,5]
這是因為數字被轉換成字符串，然后按字符代碼進行比較的。
splice
splice:把數據項插入數組的中部
1、用作刪除：只要聲明兩個參數，第一個參數為要刪除的第一個項的位置，第二個參數為刪除項的個數
復制代碼 代碼如下:
var aColors=["red","green","blue","yellow"];
aColors.splice(0,2);
alert(aColors);//outputs ["blue", "yellow"]
2、用作插入：聲明三個或以上參數(第二個參數為0)就可以把數據插入指定位置，第一個參數為地始位置，第二個參數為0，第三個及以上參數為插入項
復制代碼 代碼如下:
var aColors=["red","green","blue","yellow"];
aColors.splice(2,0,"black","white");
alert(aColors);//outputs ["red","green","black","white","blue", "yellow"]
3、用作刪除并插入：聲明三個或以上參數(第二個參數為不0)就可以把數據插入指定位置，第一個參數為地始位置，第二個參數為要刪除的項的個數，第三個及以上參數為插入項
復制代碼 代碼如下:
var aColors=["red","green","blue","yellow"];
aColors.splice(2,1,"black","white");
alert(aColors);//outputs ["red","green","black","white", "yellow"]
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