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The global Infinity property is a numeric value representing infinity.

Property attributes of Infinity
Writable no
Enumerable no
Configurable no

語法

Infinity 

描述

Infinity is a property of the global object, i.e. it is a variable in global scope.

The initial value of Infinity is Number.POSITIVE_INFINITY. The value Infinity (positive infinity) is greater than any other number. This value behaves mathematically like infinity; for example, any positive number multiplied by Infinity is Infinity, and anything divided by Infinity is 0.

Per the ECMAScript 5 specification, Infinity is read only (implemented in JavaScript 1.8.5 / Firefox 4).

範例

console.log(Infinity         ); /* Infinity */  
console.log(Infinity + 1     ); /* Infinity */  
console.log(Math.pow(10,1000)); /* Infinity */  
console.log(Math.log(0)      ); /* -Infinity */  
console.log(1 / Infinity     ); /* 0 */  

規範

Specification Status Comment
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.3
ECMAScript 5.1 (ECMA-262)
The definition of 'Infinity' in that specification.
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Infinity' in that specification.
Standard  
ECMAScript Latest Draft (ECMA-262)
The definition of 'Infinity' in that specification.
Draft  

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