JavaScript isFinite () function
JavaScript Global Functions Definition and Usage
isFinite () function is used to check whether its argument is infinite.
Tip: If the number is NaN (not a number), or positive and negative infinity, returns false.
grammar
isFinite(value)
| 参数 | 描述 |
|---|---|
| value | 必需。要检测的数字。 |
Browser Support
All major browsers support isFinite () function
Examples
Examples
Use isFinite () in an infinite number of detection:
<script>
document.write(isFinite(123)+ "<br>");
document.write(isFinite(-1.23)+ "<br>");
document.write(isFinite(5-2)+ "<br>");
document.write(isFinite(0)+ "<br>");
document.write(isFinite("Hello")+ "<br>");
document.write(isFinite("2005/12/12")+ "<br>");
</script>
document.write(isFinite(123)+ "<br>");
document.write(isFinite(-1.23)+ "<br>");
document.write(isFinite(5-2)+ "<br>");
document.write(isFinite(0)+ "<br>");
document.write(isFinite("Hello")+ "<br>");
document.write(isFinite("2005/12/12")+ "<br>");
</script>
Examples of the above output:
true
true
true
true
false
false
true
true
true
false
false
try it"
JavaScript Global Functions