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How to use join method

不言Original: 2019-02-20 16:34:383767browse

The Array.join() function is used to join the elements of the array into a string. Let's take a closer look at the specific usage of the Array.join() function.

Let’s first take a look at the basic syntax of the Array.join() function

Array.join([separator])

separator represents each element used to separate the array. A string of elements. If keeping the default array elements, separate them with commas (,).

This function returns a string created by concatenating all elements of the array using delimiters. If no delimiter is provided, the array elements are concatenated using comma (,) as it is the default delimiter for this function. If an empty string is provided as the delimiter, the elements will be concatenated directly without any characters between them. If array is empty, this function returns an empty string.

Let’s look at specific examples

Example 1:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
function func() { 
  var a = [ 1, 2, 3, 4, 5, 6 ]; 
  document.write(a.join(&#39;|&#39;)); 
} 
func(); 
</script>
</body>
</html>

The output results are as follows: 1|2|3| 4|5|6

Example 2:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
function func() { 
var a = [ 1, 2, 3, 4, 5, 6 ]; 
document.write(a.join()); 
} 

func(); 
</script> 

</body>
</html>

The output result is as follows: 1,2,3,4,5,6

Example 3:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
function func() { 
var a = [ 1, 2, 3, 4, 5, 6 ]; 
document.write(a.join(&#39;&#39;)); 
} 
func(); 
</script> 
</body>
</html>

The output result is as follows: 123456

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