JavaScript Number object is encapsulated in an object allows you handle digital value. Number Object () constructor is created by Number.
Number The main target for:
- If the argument can not be converted to a number, the return
NaN. - In the context of non-structural (eg: no
newoperator),Numberthat can be used to perform the type of conversion.
Common attributes
| Property name | Explanation |
| Number.EPSILON | Two may represent a minimum interval between (representable) Number |
| Number.MAX_SAFE_INTEGER | Maximum security integer in JavaScript (253--1). |
| Number.MAX_VALUE | The maximum number of positive energy represented. The smallest negative number is -MAX_VALUE. |
| Number.MIN_SAFE_INTEGER | JavaScript security smallest integer (- (253 - 1)). |
| Number.MIN_VALUE | The smallest positive number that is a positive number that can be represented (in fact, does not become 0) is closest to zero. The biggest negative is -MIN_VALUE. |
| Number.NaN | Special "not a number" value. |
| Number.NEGATIVE_INFINITY | Special negative infinite value, that value is returned in case of overflow. |
| Number.POSITIVE_INFINITY | Special positive infinite value, change the value returned in case of overflow. |
| Number.prototype | Number of additional objects allowed on property. |
A common method
| method | Explanation |
| Number.isNaN() | Determine whether the value of the transfer is NaN. |
| Number.isFinite() | Determining whether the passed value type is limited and the number itself. |
| Number.isInteger() | Transmission type determination value is "number", and is an integer. |
| Number.isSafeInteger() | Value determines whether the security passed integer (- (253 - 1) to 253 - between 1). |
| Number.toInteger() | Calculated value passed and convert it to an integer (or infinite) |
| Number.parseFloat() | And global objects parseFloat () the same. |
| Number.parseInt() | And global objects parseInt () the same. |
| toFixed() | A fixed-point number notation format. |
Examples
1 <!DOCTYPE html> 2 <html lang="zh"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Number对象</title> 6 </head> 7 <body> 8 <script> 9 var big = Number.MAX_VALUE;//调用number对象的MAX_VALUE最大值 10 document.write(big); 11 12 is document.write ( ' <br> ' ); 13 is 14 var n- = . 11 ; 15 var binary_value = n.toString ( 2 ); // toString () to convert the digital strings, the specified base. 16 document.write (binary_value); . 17 </ Script > 18 is </ body > . 19 </ HTML >
Web site: https: //developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Number
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