[Java新手區(qū)] javascript數(shù)組常用方法

對(duì)數(shù)組中某索引范圍進(jìn)行刪除

//聲明數(shù)組對(duì)象

var myArray = ["a", "b", "c", "d", "e"];

//從數(shù)組索引2的位置開始刪除2項(xiàng)并在索引2位置中插入x,y,z

myArray.splice(2,2,"x","y","z");

//最終數(shù)組:["a","b","x","y","z","e"]

[color=rgb(51, 102, 153) !important]復(fù)制代碼

2.reverse

對(duì)數(shù)組進(jìn)行倒序排序

//聲明數(shù)組對(duì)象并初始化

var myArray = [33,3,333];

//數(shù)組降序排序

myArray.reverse();

//結(jié)果:[333,33,3];

[color=rgb(51, 102, 153) !important]復(fù)制代碼

3.sort([fun])

對(duì)數(shù)組進(jìn)行排序，與reverse不同的點(diǎn)在于在sort方法可進(jìn)行升序和降序排序方式。當(dāng)要進(jìn)行數(shù)組中的數(shù)字進(jìn)行排序時(shí)，必須傳入自定義函數(shù)，否則無效。當(dāng)對(duì)字母進(jìn)行排序時(shí),無需傳入自定義函數(shù)，對(duì)字母進(jìn)行排序是按ASCII碼進(jìn)行排序

注: 以下代碼中的sortFunc方法中的返回值有3種情況

1.返回值大于0,a>b

2.返回值小于0,a

3.返回值等于0,a=b

//聲明數(shù)組對(duì)象并初始化

var myArray = [33,3,333];

//數(shù)組升序排序myArray.sort(sortFunc);

//結(jié)果:[3,33,333]

[color=rgb(51, 102, 153) !important]復(fù)制代碼