根据下标更改时

vm为新建的vue对象

ind为数组

第一个e为在数组ind中e索引位置

第二个e为更改为值e

vm.$set(vm.ind,e,e)

常规更改

arr为数组

//添加

arr.push(1);

//删除

arr.splice(*,*);

//替换

arr.splice(*,*,*);

splice方法

实例

例子 1

在本例中,我们将创建一个新数组,并向其添加一个元素:

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 + "
")

arr.splice(2,0,"William")

document.write(arr + "
")

输出:

George,John,Thomas,James,Adrew,Martin

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

例子 2

在本例中我们将删除位于 index 2 的元素,并添加一个新元素来替代被删除的元素:

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 + "
")

arr.splice(2,1,"William")

document.write(arr)

输出:

George,John,Thomas,James,Adrew,Martin

George,John,William,James,Adrew,Martin

例子 3

在本例中我们将删除从 index 2 ("Thomas") 开始的三个元素,并添加一个新元素 ("William") 来替代被删除的元素:

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 + "
")

arr.splice(2,3,"William")

document.write(arr)

输出:

George,John,Thomas,James,Adrew,Martin

George,John,William,Martin

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