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Math Object Methods
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FF: Firefox, N: Netscape, IE: Internet Explorer
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Method
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Description
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FF N IE
abs(x) Returns the absolute value of a number
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1 2 3
acos(x) Returns the arccosine of a number
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1 2 3
asin(x) Returns the arcsine of a number
·µ»ØÊý×ֵķ´ÕýÏÒÖµ
1 2 3
atan(x) Returns the arctangent of x as a numeric value between -PI/2 and PI/2 radians
·µ»ØÎ»ÓÚ-PI/2 ºÍ PI/2 µÄ·´ÕýÇÐÖµ
1 2 3
atan2(y,x) Returns the angle theta of an (x,y) point as a numeric value between -PI and PI radians
·µ»Ø£¨x£¬y£©Î»ÓÚ -PI µ½ PI Ö®¼äµÄ½Ç¶È
1 2 3
ceil(x) Returns the value of a number rounded upwards to the nearest integer
·µ»Ø x ËÄÉáÎåÈëºóµÄ×î´óÕûÊý
1 2 3
cos(x) Returns the cosine of a number
·µ»ØÒ»¸öÊý×ÖµÄÓàÏÒÖµ
1 2 3
exp(x) Returns the value of Ex
·µ»Ø E^x Öµ
1 2 3
floor(x) Returns the value of a number rounded downwards to the nearest integer
·µ»Ø x ËÄÉáÎåÈëºóµÄ×îСÕûÊý
1 2 3
log(x) Returns the natural logarithm (base E) of a number
·µ»Øµ×ÊýΪEµÄ×ÔÈ»¶ÔÊý
1 2 3
max(x,y) Returns the number with the highest value of x and y
·µ»Ø x ºÍ y Ö®¼ä½Ï´óµÄÊý
1 2 3
min(x,y) Returns the number with the lowest value of x and y
·µ»Ø x ºÍ y Ö®¼ä½ÏСµÄÊý
1 2 3
pow(x,y) Returns the value of x to the power of y
·µ»Ø y^x µÄÖµ
1 2 3
random() Returns a random number between 0 and 1
·µ»ØÎ»ÓÚ 0 µ½ 1 Ö®¼äµÄËæ»úº¯Êý
1 2 3
round(x) Rounds a number to the nearest integer
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1 2 3
sin(x) Returns the sine of a number
·µ»ØÊý×ÖµÄÕýÏÒÖµ
1 2 3
sqrt(x) Returns the square root of a number
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1 2 3
tan(x) Returns the tangent of an angle
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1 2 3
toSource() Represents the source code of an object
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1 4 -
valueOf() Returns the primitive value of a Math object
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1 2 4


Math Object Properties
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Property
ÊôÐÔ
Description
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FF N IE 
constructor A reference to the function that created the object
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1 2 4
E Returns Euler's constant (approx. 2.718)
·µ»ØÅ·À­³£Êý£¨½üËÆÓÚ2.718£©
1 2 3
LN2 Returns the natural logarithm of 2 (approx. 0.693)
·µ»Ø2 µÄ×ÔÈ»¶ÔÊý£¨½üËÆÖµ£º0.693£©
1 2 3
LN10 Returns the natural logarithm of 10 (approx. 2.302)
·µ»Ø10 µÄ×ÔÈ»¶ÔÊý£¨½üËÆÖµ£º2.302£©
1 2 3
LOG2E Returns the base-2 logarithm of E (approx. 1.414)
·µ»ØÒÔ2Ϊµ×µÄ¶ÔÊýµÄÊýѧ³£Êý£¬±íʾΪlog10e£¨½üËÆÖµ£º1.414£©
1 2 3
LOG10E Returns the base-10 logarithm of E (approx. 0.434)
·µ»ØÒÔ10Ϊµ×µÄ¶ÔÊýµÄÊýѧ³£Êý£¬±íʾΪlog10e£¨½üËÆÖµ£º0.434£©
1 2 3
PI Returns PI (approx. 3.14159)
·µ»ØÔ²ÖÜÂÊPI£¨½üËÆÖµ£º3.14159£©
1 2 3
prototype Allows you to add properties and methods to the object
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1 2 4
SQRT1_2 Returns the square root of 1/2 (approx. 0.707)
·µ»Ø1/2µÄƽ·½¸ù£¨½üËÆÖµ£º0.707£©
1 2 3
SQRT2 Returns the square root of 2 (approx. 1.414)
·µ»Ø2µÄƽ·½¸ù£¨½üËÆÖµ£º1.414£©
1 2 3

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