ceil-floor.js

来自「这是《JavaScript学习源代码》一书的源代码」· JavaScript 代码 · 共 9 行

var a = 7.5;
var a1 = "a1 : " + Math.ceil(a);
var a2 = "a2 : " + Math.floor(a);
var b = -7.5;
var b1 = "b1 : " + Math.ceil(b);
var b2 = "b2 : " + Math.floor(b);
var rup = "ROUNDING UP\n" +a1+ "\n" +b1+ "\n\n";
var rdn = "ROUNDING DOWN\n" +a2+ "\n" +b2;
alert( rup + rdn );