JavaScript Function Reference
The top-level properties and functions can be used on all of the built-in JavaScript objects.
Top-level Functions
FF: Firefox, N: Netscape, IE: Internet Explorer
| Function |
Description |
FF |
N |
IE |
| decodeURI() |
Decodes an encoded URI |
1 |
4 |
5.5 |
| decodeURIComponent() |
Decodes an encoded URI component |
1 |
4 |
5.5 |
| encodeURI() |
Encodes a string as a URI |
1 |
4 |
5.5 |
| encodeURIComponent() |
Encodes a string as a URI component |
1 |
4 |
5.5 |
| escape() |
Encodes a string |
1 |
- |
3 |
| eval() |
Evaluates a string and executes it as if it was script code |
1 |
2 |
3 |
| isFinite() |
Checks if a value is a finite number |
1 |
4 |
4 |
| isNaN() |
Checks if a value is not a number |
1 |
2 |
3 |
| Number() |
Converts an object's value to a number |
1 |
|
|
| parseFloat() |
Parses a string and returns a floating point number |
1 |
2 |
3 |
| parseInt() |
Parses a string and returns an integer |
1 |
2 |
3 |
| String() |
Converts an object's value to a string |
1 |
|
|
| unescape() |
Decodes a string encoded by escape() |
1 |
- |
3 |
Top-level Properties
| Property |
Description |
FF |
N |
IE |
| Infinity |
A numeric value that represents positive or negative
infinity |
1 |
4 |
4 |
| NaN |
Indicates that a value is "Not a Number" |
1 |
4 |
4 |
| undefined |
Indicates that a variable has not been assigned a value |
1 |
4 |
5.5 |
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