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:
<script type="text/javascript">
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 />")
</script>
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:
<script type="text/javascript">
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)
</script>
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:
<script type="text/javascript">
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)
</script>
输出:
George,John,Thomas,James,Adrew,Martin
George,John,William,Martin