📅 最后修改于: 2020-12-18 05:01:33 🧑 作者: Mango
Number对象代表数字日期，可以是整数，也可以是浮点数。通常，您无需担心Number对象，因为浏览器会自动将数字字面量转换为数字类的实例。
创建数字对象的语法如下-
var val = new Number(number);
如果您提供数字非数字参数，那么该数字将不能转换为数字，而是返回NaN (非数字)。
这是每个属性及其说明的列表。
| Sr.No. | Property & Description |
|---|---|
| 1 | MAX_VALUE
The largest possible value a number in JavaScript can have 1.7976931348623157E+308 |
| 2 | MIN_VALUE
The smallest possible value a number in JavaScript can have 5E-324 |
| 3 | NaN
Equal to a value that is not a number. |
| 4 | NEGATIVE_INFINITY
A value that is less than MIN_VALUE. |
| 5 | POSITIVE_INFINITY
A value that is greater than MAX_VALUE |
| 6 | prototype
A static property of the Number object. Use the prototype property to assign new properties and methods to the Number object in the current document |
| 7 | constructor
Returns the function that created this object’s instance. By default this is the Number object. |
在以下各节中，我们将通过一些示例来演示Number的属性。
Number对象仅包含默认方法，这些方法是每个对象定义的一部分。
| Sr.No. | Method & Description |
|---|---|
| 1 | toExponential()
Forces a number to display in exponential notation, even if the number is in the range in which JavaScript normally uses standard notation. |
| 2 | toFixed()
Formats a number with a specific number of digits to the right of the decimal. |
| 3 | toLocaleString()
Returns a string value version of the current number in a format that may vary according to a browser’s local settings. |
| 4 | toPrecision()
Defines how many total digits (including digits to the left and right of the decimal) to display of a number. |
| 5 | toString()
Returns the string representation of the number’s value. |
| 6 | valueOf()
Returns the number’s value. |
在以下各节中，我们将通过一些示例来解释Number的方法。