創建Array對象
複製代碼 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
複製代碼 代碼如下:
var aColors=["red","green","blue"];
alert((","));//outputs "red,green,blue"
alert(("-spring-"));//outputs "red-spring-green-spring-blue"
alert(("]["));//outputs "red][green][blue"
split:分拆字符串
複製代碼 代碼如下:
var sColors="red,green,blue";
var aColors=t(",");//outputs ["red", "green", "blue"]
var redColors=aColors[0]t("");//outputs ["r", "e", "d"]
concat && slice
concat:追加數組
複製代碼 代碼如下:
var aColors=["red","green","blue"];
var aColors2=at("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
複製代碼 代碼如下:
var aColors=["red","green","blue","yellow","purple"];
var aColors2=e(1);//outputs ["green","blue","yellow","purple"]
var aColors3=e(1,4);//outputs ["green","blue","yellow"]
push && pop
跟棧一樣，Array提供了push和pop方法，push方法用於在Array結尾添加一個或多個項，pop用於刪除最後一個數組項，返回它作爲函數值
複製代碼 代碼如下:
var stack=new Array;
("red");
("green");
("blue");
alert(stack);//outputs ["red","green","blue"]
var vItem=();
alert(vItem);//outputs ["blue"]
alert(stack);//otputs ["red","green"]
shift && unshift
shift:刪除數組中第一項，將其作爲函數返回值，unshift:把一個項放在數組的第一個位置，然後把餘下的項向下移動一個位置
複製代碼 代碼如下:
var aColors=["red","green","blue"];
var vItem=t();
alert(aColors);//outputs ["green","blue"]
alert(vItem);//outputs ["red"]
ift("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)
複製代碼 代碼如下:
var aColors=["blue","green","red"];
rse();
alert(aColors);//outputs ["red","green","blue"]
();
alert(aColors);//outputs ["blue","green","red"]
注意：
複製代碼 代碼如下:
var aColors=[3,32,2,5];
();
alert(aColors);//outputs [2,3,32,5]
這是因爲數字被轉換成字符串，然後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，第一個參數爲要刪除的第一個項的`位置，第二個參數爲刪除項的個數
複製代碼 代碼如下:
var aColors=["red","green","blue","yellow"];
ce(0,2);
alert(aColors);//outputs ["blue", "yellow"]
2、用作插入：聲明三個或以上參數(第二個參數爲0)就可以把數據插入指定位置，第一個參數爲地始位置，第二個參數爲0，第三個及以上參數爲插入項
複製代碼 代碼如下:
var aColors=["red","green","blue","yellow"];
ce(2,0,"black","white");
alert(aColors);//outputs ["red","green","black","white","blue", "yellow"]
3、用作刪除並插入：聲明三個或以上參數(第二個參數爲不0)就可以把數據插入指定位置，第一個參數爲地始位置，第二個參數爲要刪除的項的個數，第三個及以上參數爲插入項
複製代碼 代碼如下:
var aColors=["red","green","blue","yellow"];
ce(2,1,"black","white");
alert(aColors);//outputs ["red","green","black","white", "yellow"]
