數(shù)組處理方法

//定義數(shù)組

var array = [];

undefined

//查看類型

typeof(array);

"object"

//往數(shù)組里添加數(shù)據(jù)

array = ['first','second','third']

["first", "second", "third"]

//數(shù)組長度

array.length

3

//索引

array[0]

"first"

//添加數(shù)組新內(nèi)容

array[3] = 'fourth'

"fourth"

array

["first", "second", "third", "fourth"]

//使用push添加數(shù)組的新數(shù)據(jù)，是往數(shù)組后添加數(shù)據(jù)

array.push('fifth','sixth')

6

array

["first", "second", "third", "fourth", "fifth", "sixth"]

//往前添加是使用unshift-------------------

var newArray = ["second", "three", "four", "one", "two"]

newArray.unshift('haha')

6

newArray

["haha", "second", "three", "four", "one", "two"]

//-----------------------

//刪除數(shù)據(jù)最后一個元素使用pop

array.pop()

"sixth"

array

["first", "second", "third", "fourth", "fifth"]

///刪除數(shù)組第一個元素使用shift

array.shift()

"first"

///刪除數(shù)組中某一個元素的值會使用delete，不會刪除數(shù)組中該元素

delete array[3]

true

array

["second", "third", "fourth", undefined × 1]

//徹底刪除數(shù)組里的元素使用splice方法

array.splice(3)

[undefined × 1]

array

["second", "third", "fourth"]

//合并兩個數(shù)組使用concat

var array2 = ['one','two']

undefined

var newArray = array.concat(array2)

undefined

newArray

["second", "third", "fourth", "one", "two"]

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