Array splice()
JavaScript数组splice()方法用于在现有数组中添加元素或从中删除元素。它返回从数组中删除的元素。 splice()方法还可以修改原始数组。
语法
splice()方法由以下语法表示：
array.splice(start,delete,element1,element2,?,elementn)
参数
start-表示方法开始提取元素的索引。
delete-是可选的。它表示要删除的元素数。
element1，element2，...，elementn -是可选的。它表示要插入的元素。
返回
包含删除的元素的新数组。
JavaScript数组splice()方法示例
在这里，我们将通过各种示例来理解splice()方法。
示例1
让我们看一个示例在不删除其他元素的情况下将元素添加到现有数组中。
<script>
var arr=["Monday","Tuesday","Thursday","Friday"];
var result=arr.splice(2,0,"Wednesday")
document.writeln(arr);
</script>
输出：
Monday,Tuesday,Wednesday,Thursday,Friday
示例2
让我们看一个示例，在删除其他元素的同时向现有数组添加一个元素。
<script>
var arr=["Monday","Tuesday","Saturday","Sunday","Thursday","Friday"];
var result=arr.splice(2,2,"Wednesday")
document.writeln("Updated array: "+arr+"<br>");
document.writeln("Removed element: "+result);
</script>
输出：
Updated array: Monday,Tuesday,Wednesday,Thursday,Friday
Removed element: Saturday,Sunday
示例3
让我们看一个示例，在删除一个元素的同时向现有数组添加两个元素。
<script>
var arr=["Monday","Tuesday","Sunday","Friday"];
var result=arr.splice(2,1,"Wednesday","Thursday");
document.writeln("Updated array: "+arr+"<br>");
document.writeln("Removed element: "+result);
</script>
输出：
Updated array: Monday,Tuesday,Wednesday,Thursday,Friday
Removed element: Sunday
示例4
让我们看一个示例，从现有数组中删除元素。
<script>
var arr=["Monday","Tuesday","Saturday","Sunday","Thursday","Friday"];
var result=arr.splice(2);
document.writeln("Updated array: "+arr+"<br>");
document.writeln("Removed element: "+result);
</script>
输出：
Updated array: Monday,Tuesday
Removed element: Saturday,Sunday,Thursday,Friday
