//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>"); }