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Detailed explanation of the use of splice() method in JavaScript

高洛峰Original: 2017-01-03 16:17:331430browse

The splice() method of JavaScript array changes the contents of the array, adding new elements and eliminating old elements.
Syntax

array.splice(index, howMany, [element1][, ..., elementN]);

The following are the details of the parameters:

Index: The array starting to change at this index.

howMany: Integer, indicating the number of old array elements to remove. If howmany is 0, no elements are removed.

element1, ..., elementN: Elements are added to the array. If no elements are specified, concatenation simply removes elements from the array.

Return value:

Returns an array extracted based on the passed parameters.
Example:

<html>
<head>
<title>JavaScript Array splice Method</title>
</head>
<body>
<script type="text/javascript">
var arr = ["orange", "mango", "banana", "sugar", "tea"];
 
var removed = arr.splice(2, 0, "water");
document.write("After adding 1: " + arr );
document.write("<br />removed is: " + removed);
 
removed = arr.splice(3, 1);
document.write("<br />After adding 1: " + arr );
document.write("<br />removed is: " + removed);
 
</script>
</body>
</html>

This will produce the following results:

After adding 1: orange,mango,water,banana,sugar,tea
removed is:
After adding 1: orange,mango,water,sugar,tea
removed is: banana

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