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How to use isInteger function

不言Original: 2019-02-19 17:02:025101browse

The Number.isInteger() function in How to use isInteger function is used to check whether the value passed to it is an integer. Returns true if the passed value is an integer, false otherwise. Let's take a look at the specific usage of the isInteger function.

Let’s first look at the basic syntax of the isInteger function

Number.isInteger（value）

value represents the number that the user wants to check whether it is an integer.

Let’s look at a specific example

Passing negative numbers as parameters:If a negative integer value is passed to a function as a parameter, the function will return true. If it is passed to Its negative value is not an integer type, then the function will return false.

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script type="text/javascript"> 
    document.write(Number.isInteger(-2));  
    document.write(Number.isInteger(-2.56));           
</script> 
</body>
</html>

The output result is:

true
false

Pass a positive number as a parameter: If you pass a positive integer value as a parameter to function, the function will return true, if the positive value passed to it is not of integer type, the function will return false.

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script type="text/javascript"> 
    document.write(Number.isInteger(2));           
</script> 
</body>
</html>

The output result is: true

Pass zero as parameter: If zero is passed to Number.isInteger() function, it will return true because zero is also an integer.

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script type="text/javascript"> 
    document.write(Number.isInteger(0));           
</script> 
</body>
</html>

The output result is: true

Pass a string as a parameter: If passed to the Number.isInteger() function The parameter is of type string, then it will return false.

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script type="text/javascript"> 
    document.write(Number.isInteger("hi"));           
</script> 
</body>
</html>

The output result is: false

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