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