What is the Math object in js? how to use? What this article brings to you is to introduce the properties and methods of the Math object, so that everyone can understand how to use the Math object. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you. [Recommended related video tutorials: JavaScript Tutorial]
1. Properties of the Math object
(1) E: Returns the arithmetic constant e, that is The base of the natural logarithm (approximately equal to 2.718).
(2) LN2: Returns the natural logarithm of 2 (approximately equal to 0.693).
(3) LN10: Returns the natural logarithm of 10 (approximately equal to 2.302).
(4) LOG2E: Returns the logarithm of e with base 2 (approximately equal to 1.443).
(5) LOG10E: Returns the logarithm of e with base 10 (approximately equal to 0.434).
(6) PI: Returns pi (approximately equal to 3.14159).
(7) SQRT1_2: Returns the reciprocal of the square root of 2 (approximately equal to 0.707).
(8) SQRT2: Returns the square root of 2 (approximately equal to 1.414).
<script type="text/javascript">
document.write('属性E<br/>');
document.write(Math.E);
document.write('<br/><br/>属性LN2<br/>');
document.write(Math.LN2);
document.write('<br/><br/>属性LN10<br/>');
document.write(Math.LN10);
document.write('<br/><br/>属性LOG2E<br/>');
document.write(Math.LOG2E);
document.write('<br/><br/>属性LOG10E<br/>');
document.write(Math.LOG10E);
document.write('<br/><br/>属性PI<br/>');
document.write(Math.PI);
document.write('<br/><br/>属性SQRT1_2<br/>');
document.write(Math.SQRT1_2);
document.write('<br/><br/>属性SQRT2<br/>');
document.write(Math.SQRT2);
</script>The value of each attribute:
2. Math object method
(1) abs( x): Returns the absolute value of the number.
<script type="text/javascript">
var x=-3;
document.write('abs(x)方法：<br/>');
document.write(Math.abs(x));
</script>
(2) acos(x): Returns the arc cosine of the number.
<script type="text/javascript">
var x=0.5;
document.write('acos(x)方法：<br/>');
document.write(Math.acos(x));
</script>
(3) asin(x): Returns the arcsine of the number.
<script type="text/javascript">
var x=1;
document.write('asin(x)方法：<br/>');
document.write(Math.asin(x));
</script>
(4) atan(x): Returns the arctangent of x as a number between -PI/2 and PI/2 radians.
<script type="text/javascript">
var x=1;
document.write('atan(x)方法：<br/>');
document.write(Math.atan(x));
</script>
(5) atan2(y,x): Returns the angle from the x-axis to the point (x,y) (between -PI/2 and PI/2 between radians).
<script type="text/javascript">
var x=0.5; var y=1;
document.write('atan2(y,x)方法：<br/>');
document.write(Math.atan2(y,x));
</script>
(6) ceil(x): Round the number up.
<script type="text/javascript">
var x=0.5;
document.write('ceil(x)方法：<br/>');
document.write(Math.ceil(x));
</script>
(7) cos(x): Returns the cosine of the number.
<script type="text/javascript">
var x=0;
document.write('cos(x)方法：<br/>');
document.write(Math.cos(x));
</script>
(8) exp(x): Returns the exponent of e.
<script type="text/javascript">
var x=1;
document.write('exp(x)方法：<br/>');
document.write(Math.exp(x));
</script>
(9) floor(x): Round the number down.
<script type="text/javascript">
var x=1;
document.write('floor(x)方法：<br/>');
document.write(Math.floor(x));
</script>
(10) log(x): Returns the natural logarithm of the number (base is e).
<script type="text/javascript">
var x=10;
document.write('log(x)方法：<br/>');
document.write(Math.log(x));
</script>
(11) max(x,y): Returns the highest value between x and y.
<script type="text/javascript">
var x=10; var y=32;
document.write('max(x,y)方法：<br/>');
document.write(Math.max(x,y));
</script>
(12) min(x,y): Returns the lowest value between x and y.
<script type="text/javascript">
var x=10; var y=32;
document.write('min(x,y)方法：<br/>');
document.write(Math.min(x,y));
</script>
(13) pow(x,y): Returns the y power of x.
<script type="text/javascript">
var x=2; var y=3;
document.write('pow(x,y)方法：<br/>');
document.write(Math.pow(x,y));
</script>
(14) random(): Returns a random number between 0 ~ 1.
<script type="text/javascript">
document.write('random()方法：<br/>');
document.write(Math.random());
</script>
(15) round(x): Round the number to the nearest integer.
<script type="text/javascript">
var x=23.4353;
document.write('round(x)方法：<br/>');
document.write(Math.round(x));
</script>
(16) sin(x): Returns the sine of the number.
<script type="text/javascript">
var x=Math.PI/2;
document.write('sin(x)方法：<br/>');
document.write(Math.sin(x));
</script>
(17) sqrt(x): Returns the square root of the number.
<script type="text/javascript">
var x=2;
document.write('sqrt(x)方法：<br/>');
document.write(Math.sqrt(x));
</script>
(18) tan(x): Returns the tangent of the angle.
<script type="text/javascript">
var x=1;
document.write('tan(x)方法：<br/>');
document.write(Math.tan(x));
</script>
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