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JavaScript join() method to put all elements in an array into a string

黄舟Original: 2017-11-03 10:28:264602browse

Definition and usage

join() method is used to put all elements in array into a string.

Elements are separated by the specified delimiter.

Syntax

arrayObject.join(separator)

Parameters	Description
separator	Optional. Specify the delimiter to use. If this parameter is omitted, a comma is used as the delimiter.

Return value

Returns a string. The string is generated by converting each element of the arrayObject to a string, then concatenating the strings, and inserting a separator string between the two elements. Example

Example 1

In this example, we will create an array and then put all its elements into a string:

<script type="text/javascript">

var arr = new Array(3)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"

document.write(arr.join())

</script>

Output:

George,John,Thomas

Example 2

In this example, we will use the delimiter to separate the elements in the array:

<script type="text/javascript">

var arr = new Array(3)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"

document.write(arr.join("."))

</script>

Output:

George.John.Thomas

The following are the details of the parameters:

    separator : 指定字符串分开数组的每个元素。如果省略，则数组元素用逗号分隔。

Return value:

Returns the string after joining all array elements.

Example:

<html>
<head>
<title>JavaScript Array join Method</title>
</head>
<body>
<script type="text/javascript">
 
var arr = new Array("First","Second","Third");
 
var str = arr.join();
document.write("str : " + str ); 
 
var str = arr.join(", ");
document.write("<br />str : " + str ); 
 
var str = arr.join(" + ");
document.write("<br />str : " + str ); 
</script>
</body>
</html>

This will produce the following results:

str : First,Second,Third
str : First, Second, Third
str : First + Second + Third

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