属性
| 属性 |
描述 |
| Number.MAX_VALUE |
The largest representable number (±1.7976931348623157e+308) |
| Number.MIN_VALUE |
The smallest representable number (±5e-324) |
| Number.NaN |
Special “not a number” value |
| Number.NEGATIVE_INFINITY |
Special negative infinite value; returned on overflow |
| Number.POSITIVE_INFINITY |
Special positive infinite value; returned on overflow |
| Number.EPSILON |
Difference between 1 and the smallest value greater than 1 that can be represented as a Number (2.220446049250313e-16) |
| Number.MIN_SAFE_INTEGER |
Minimum safe integer in JavaScript (−253 + 1, or −9007199254740991) |
| Number.MAX_SAFE_INTEGER |
Maximum safe integer in JavaScript (+253 − 1, or +9007199254740991) |
方法
| Method |
Description |
| Number.parseFloat() |
Parses a string argument and returns a floating point number.Same as the global parseFloat() function. |
| Number.parseInt() |
Parses a string argument and returns an integer of the specified radix or base.Same as the global parseInt() function. |
| Number.isFinite() |
Determines whether the passed value is a finite number. |
| Number.isInteger() |
Determines whether the passed value is an integer. |
| Number.isNaN() |
Determines whether the passed value is NaN. More robust version of the original global isNaN(). |
| Number.isSafeInteger() |
Determines whether the provided value is a number that is a safe integer. |
Methods of Number.prototype
| Method |
Description |
| toExponential() |
Returns a string representing the number in exponential notation. |
| toFixed() |
Returns a string representing the number in fixed-point notation. |
| toPrecision() |
Returns a string representing the number to a specified precision in fixed-point notation. |
参考:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Numbers_and_dates
