JavaScript Number Object
Number Object
Number object is a wrapper object original value.
Number way to create new Number ().
grammar
var num = new Number(value);
Note: If a parameter value can not be converted to a digital returns NaN (not a numeric value).
Number Object Properties
Attributes | description |
---|---|
constructor | Returns Number to create this object reference to a function. |
MAX_VALUE | The maximum number that can be represented. |
MIN_VALUE | The minimum number can be represented. |
NEGATIVE_INFINITY | Negative infinity, return the value overflow. |
NaN | Non-numeric values. |
POSITIVE_INFINITY | Positive infinity, return the value overflow. |
prototype | It allows you to have the ability to add properties and methods to an object. |
Number Object
方法 | 描述 |
---|---|
toExponential(x) | 把对象的值转换为指数计数法。 |
toFixed(x) | 把数字转换为字符串,结果的小数点后有指定位数的数字。 |
toPrecision(x) | 把数字格式化为指定的长度。 |
toString() | 把数字转换为字符串,使用指定的基数。 |
valueOf() | 返回一个 Number 对象的基本数字值。 |