Math object
plain is a built-in objects related to perform mathematical operations, can not create an object using the new keyword.
Use its properties mainly Math. Attribute name , here are some common attributes
- Math.random (): returns a random number between 0-1
- Math.abs (parameter): returns the absolute value of parameter
- Math.floor (parameter): The parameter is rounded down
- Math.pow (parameter1, parameter2): Returns the power parameter1 parameter2 of
- Math.round (parameter): parameter to rounding
- Math.PI: Returns pi
- …
- …
Following completion of the above-described case of a small floor and random property (page random background: The background color using the RGB representation)
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>网页背景随机颜色</title>
<script type="text/javascript">
// 定义一个随机背景函数：onload属性：网页打开(刷新)时即调用函数
window.onload = function(){
var min = 0;
var max = 256;
// 创建三个0--255的随机整数
var number1 = Math.floor(Math.random()*(max-min)+min);
var number2 = Math.floor(Math.random()*(max-min)+min);
var number3 = Math.floor(Math.random()*(max-min)+min);
// 将rgb颜色表示弹出来
// window.alert('rgb颜色表示为:rgb('+number1+','+number2+','+number3+')');
// 设置背景
document.body.bgColor = 'RGBColor('+number1,number2,number4+')';
}
</script>
</head>
<body>
</body>
</html>
