JavaScript--Math对象

	//绝对值
	var x = -33.33;
	x = Math.abs(x);
	println(x);//33.33
	
	//向上取整
	x = 22.22;
	x = Math.ceil(x);
	println(x);//23
	
	//向下取整
	x = 22.22;
	x = Math.floor(x);
	println(x);//22
	
	//e的3次幂
	println(Math.exp(3));//20.085536923187668
	
	//x的y次幂
	println(Math.pow(3,3));//27
	
	//四舍五入
	println(Math.round(3.14));//3
	println(Math.round(5.66));//6
	
	//随机数
	//生成十个1~10的随机整数
	println("<br>十个1~10随机数:");
	for(var i = 0; i<10; i++){
		//方式1:
		//print(Math.ceil(Math.random()*10)+" ");
		//方式2:
		//print(Math.floor(Math.random()*10+1)+" ");
		//方式3:
		print(parseInt(Math.random()*10)+1+" ");
	}
function print(e){
	document.write(e);
}

function println(e){
	document.write(e+"<br>");
}


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转载自blog.csdn.net/qq_38238041/article/details/80723387
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