Infinity

The global Infinity property is a numeric value representing infinity.

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

瀏覽器相容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

參見

• Number.NEGATIVE_INFINITY
• Number.POSITIVE_INFINITY
• Number.isFinite