JavaScript(JS) Number.MAX_VALUE
JavaScript(JS) Number.MIN_VALUE
JavaScript(JS) Number.NaN
JavaScript(JS) Number.NEGATIVE_INFINITY
JavaScript(JS) Number.POSITIVE_INFINITY
JavaScript(JS) number.constructor
JavaScript(JS) object.prototype
JavaScript(JS) number.toExponential()
JavaScript(JS) number.toFixed()
JavaScript(JS) number.toLocaleString()
JavaScript(JS) number.toPrecision()
JavaScript(JS) number.toString()
JavaScript(JS) number.valueOf()
JavaScript(JS) boolean.constructor()
JavaScript(JS) boolean.toSource()
JavaScript(JS) boolean.toString()
JavaScript(JS) boolean.valueOf()
JavaScript(JS) string.constructor
JavaScript(JS) string.length
JavaScript(JS) string.charAt(index)
JavaScript(JS) string.charCodeAt(index)
JavaScript(JS) string.concat(string2, string3[, ..., stringN])
JavaScript(JS) string.indexOf(searchValue[, fromIndex])
JavaScript(JS) string.lastIndexOf(searchValue[, fromIndex])
JavaScript(JS) string.localeCompare( param )
JavaScript(JS) string.match( param )
JavaScript(JS) string.replace(regexp/substr, newSubStr/function[, flags])
JavaScript(JS) string.search(regexp)
JavaScript(JS) string.slice( beginslice [, endSlice] )
JavaScript(JS) string.split([separator][, limit])
JavaScript(JS) string.substr(start[, length])
JavaScript(JS) string.substring(indexA, [indexB])
JavaScript(JS) string.toLocaleLowerCase( )
JavaScript(JS) string.toLocaleUpperCase( )
JavaScript(JS) string.toLowerCase( )
JavaScript(JS) string.toString( )
JavaScript(JS) string.toUpperCase( )
JavaScript(JS) string.valueOf( )
JavaScript(JS) string.anchor(anchorname )
JavaScript(JS) string.big( )
JavaScript(JS) string.blink( )
JavaScript(JS) string.bold( )
JavaScript(JS) string.fixed( )
JavaScript(JS) string.fontcolor( color )
JavaScript(JS) string.fontsize( size )
JavaScript(JS) string.italics( )
JavaScript(JS) string.link( hrefname )
JavaScript(JS) string.strike( )
JavaScript(JS) string.sub( )
JavaScript(JS) string.sup( )
JavaScript(JS) string.small( )
JavaScript(JS) array.constructor
JavaScript(JS) array.length
JavaScript(JS) array.concat(value1, value2, ..., valueN)
JavaScript(JS) array.every(callback[, thisObject])
JavaScript(JS) array.filter(callback[, thisObject])
JavaScript(JS) array.forEach(callback[, thisObject])
JavaScript(JS) array.indexOf(searchElement[, fromIndex])
JavaScript(JS) array.join(separator)
JavaScript(JS) array.lastIndexOf(searchElement[, fromIndex])
JavaScript(JS) array.map(callback[, thisObject])
JavaScript(JS) array.pop()
JavaScript(JS) array.push(element1, ..., elementN)
JavaScript(JS) array.reduce(callback[, initialValue])
JavaScript(JS) array.reduceRight(callback[, initialValue])
JavaScript(JS) array.reverse()
JavaScript(JS) array.shift()
JavaScript(JS) array.slice( begin [,end] )
JavaScript(JS) array.some(callback[, thisObject])
JavaScript(JS) array.toSource()
JavaScript(JS) array.sort( compareFunction )
JavaScript(JS) array.splice(index, howMany, [element1][, ..., elementN])
JavaScript(JS) array.toString()
JavaScript(JS) array.unshift( element1, ..., elementN )
JavaScript(JS) Math.E
JavaScript(JS) Math.LN2
JavaScript(JS) Math.LN10
JavaScript(JS) Math.LOG2E
JavaScript(JS) Math.LOG10E
JavaScript(JS) Math.PI
JavaScript(JS) Math.SQRT1_2
JavaScript(JS) Math.SQRT2
JavaScript(JS) Math.abs( x )
JavaScript(JS) Math.acos( x )
JavaScript(JS) Math.asin( x )
JavaScript(JS) Math.atan( x )
JavaScript(JS) Math.atan2( x, y )
JavaScript(JS) Math.ceil( x )
JavaScript(JS) Math.cos( x )
JavaScript(JS) Math.exp( x )
JavaScript(JS) Math.floor( x )
JavaScript(JS) Math.log( x )
JavaScript(JS) Math.max(value1, value2, ... valueN )
JavaScript(JS) Math.min(value1, value2, ... valueN )
JavaScript(JS) Math.pow(base, exponent )
JavaScript(JS) Math.random()
JavaScript(JS) Math.round( x )
JavaScript(JS) Math.sin( x )
JavaScript(JS) Math.sqrt( x )
JavaScript(JS) Math.tan( x )

JavaScript(JS) Math.PI

手机查看 2021-08-29

Math对象为数学常量和函数提供属性和方法。与其他全局对象不同，Math不是构造函数。Math的所有属性和方法都是静态的，可以通过将Math作为对象来调用，而无需创建它。本文主要介绍JavaScript(JS) Math.PI 属性。

1、描述

它返回圆的周长与直径的比值，约为3.14159。

2、语法

它的语法如下：

Math.PI

3、使用示例

<html>  
   <head>
      <title>JavaScript Math PI Property</title>
   </head>
   
   <body>      
      <script type = "text/javascript">
         var property_value = Math.PI;
         document.write("Property Value = " + property_value); 
      </script>   
   </body>
</html>