JavaScript Array
数组基础:创建数组,访问数组,遍历数组
创建数组:
// Create an empty array
var emptyArray = [ ];
// Create an array of fruit
var fruits = [ "apple", "pear", "orange", "banana" ];
访问数组:
arrayName[index]
遍历数组:
var fruits = new Array ( "apple", "pear", "orange", "banana", "peach", "strawberry" );
for ( i=0; i < fruits.length; i++ )
{
alert ( fruits[i] );
}
数组中级:截取数组,连接数组,数组的转换,增加和删除数组中的值,数组排序
slice()方法:
数组高级:数组的嵌套,遍历嵌套数组。
arraySlice = array.slice ( begin [, end] )
concat()方法:
result = array.concat ( value1, value2, ..., valueN );
toString() 和 join()方法:
result = array.toString ( );
result = array.join ( separator );
unshift()
, shift()
, push()
, pop()
and splice()
Adding and removing in the middle of an array: splice()
removedElements = array.splice ( index, numberToRemove, [value1][, value2, ..., valueN] );
Summarizing unshift(), shift(), push() and pop()
- unshift()
- Adds elements to the start of an array
- shift()
- Removes 1 element from the start of an array
- push()
- Adds elements to the end of an array
- pop()
- Removes 1 element from the end of an array
数组高级:嵌套数组,数组遍历
Nested Arrays
var pets = new Array ( );
pets[0] = new Array ( "Sheba", 13, "cat" );
pets[1] = new Array ( "Jasper", 12, "dog" );
alert ( pets[0][0] + " is a " + pets[0][1] + " year old " + pets[0][2] ); // Displays "Sheba is a 13 year old cat"
alert ( pets[1][0] + " is a " + pets[1][1] + " year old " + pets[1][2] ); // Displays "Jasper is a 12 year old dog"
Looping nested Array
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
var pets = new Array ( );
pets[0] = new Array ( "Sheba", 13, "cat" );
pets[1] = new Array ( "Jasper", 12, "dog" );
var dinosaurs = new Array ( );
dinosaurs[0] = new Array ( "Cyril", 45, "Tyrannosaur" );
dinosaurs[1] = new Array ( "Gertrude", 72, "Brontosaur" );
var animals = new Array ( pets, dinosaurs );
alert ( animals[0][1][0] + " is a " + animals[0][1][1] + " year old " + animals[0][1][2] ); // Displays "Jasper is a 12 year old dog"
for ( i=0; i<animals.length; i++ )
{
for ( j=0; j<animals[i].length; j++ )
{
alert ( animals[i][j][0] + " is a " + animals[i][j][1] + " year old " + animals[i][j][2] );
}
}