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How to use Number function

不言Original: 2019-02-20 17:51:405195browse

Number() in How to use Number function is a built-in javascript function used to convert data types to numbers. Let's take a look at the specific use of the Number function.

Let’s first take a look at the basic syntax of the Number function

Number(query javascript variable)

Parameters: The number function is the javascript variable input by the user to be converted. The number function converts any type of javascript variable to numeric type.

The number function returns the number format of any type of javascript variable.

Let’s look at a few specific examples

Example 1:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
function func() { 
  
        var value = Number(true); 
        document.write(value); 
    } 
func(); 
</script>  
</body>
</html>

The output result is: 1

Example 2:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
 function func() { 
        var a = "10 20"; 
  
        var value = Number(a); 
        document.write(value); 
    } 
func(); 
</script>  
</body>
</html>

The output result is: NaN

Example 3:

The code is as follows

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
<script> 
function func() { 
        var value = Number(new Date("2017-09-30")); 
        document.write(value); 
    } 
func(); 
</script>  
</body>
</html>

The output result is: 1506729600000

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