1，split方法

split() 方法用于把一个字符串分割成字符串数组。
例如：数据中现在有这样一个结果 128b8f730592cc8db33ea52985127d44,44bee6555822d8321d2d1a2c1ac3b2cf,b2f939f26e512934e165f3e784cc74ca,
我需要把这个字符串变成数组

			console.log(res.result.productImgIds)
			//128b8f730592cc8db33ea52985127d44,44bee6555822d8321d2d1a2c1ac3b2cf,b2f939f26e512934e165f3e784cc74ca,

            this.productImgList = res.result.productImgIds.split(',')
            console.log(this.productImgList)
            //(4) ["128b8f730592cc8db33ea52985127d44", "44bee6555822d8321d2d1a2c1ac3b2cf", "b2f939f26e512934e165f3e784cc74ca", "", __ob__: Observer]
            
            
            this.productImgList.splice((this.productImgList.length-1),1)
            console.log(this.productImgList)
            //(3) ["128b8f730592cc8db33ea52985127d44", "44bee6555822d8321d2d1a2c1ac3b2cf", "b2f939f26e512934e165f3e784cc74ca", __ob__: Observer]

在split方法中以 ‘，’结尾的就会分割，返回一个数组，这个数组目前就是我们想要的

例如：

"2:3:4:5".split(":")	//将返回["2", "3", "4", "5"]
"|a|b|c".split("|")	//将返回["", "a", "b", "c"]

2,splice() 方法

splice() 方法向/从数组中添加/删除项目，然后返回被删除的项目。

arrayObject.splice(index,howmany,item1,…,itemX)

index 必需要填写的。整数，规定添加/删除项目的位置，使用负数可从数组结尾处规定位置。
howmany 必需要填写的。要删除的项目数量。如果设置为 0，则不会删除项目。
item1, …, itemX 可选。向数组添加的新项目。

howmany 为0 的时候

var arr = new Array(6)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
arr[3] = "James"
arr[4] = "Adrew"
arr[5] = "Martin"

document.write(arr + "<br />")
arr.splice(2,0,"William")
document.write(arr + "<br />")

George,John,Thomas,James,Adrew,Martin
George,John,William,Thomas,James,Adrew,Martin

howmany 为1 的时候

var arr = new Array(6)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
arr[3] = "James"
arr[4] = "Adrew"
arr[5] = "Martin"

document.write(arr + "<br />")
arr.splice(2,1,"William")
document.write(arr)

George,John,Thomas,James,Adrew,Martin
George,John,William,James,Adrew,Martin

howmany 为3 的时候

var arr = new Array(6)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
arr[3] = "James"
arr[4] = "Adrew"
arr[5] = "Martin"

document.write(arr + "<br />")
arr.splice(2,3,"William")
document.write(arr)

George,John,Thomas,James,Adrew,Martin
George,John,William,Martin