js四舍五入数学函数round使用实例

Math.round(number)

document.write(Math.round(2.65));// print 3
document.write(Math.round(7.05));// print 7
document.write(Math.round(-2.65));// print -3
document.write(Math.round(-8.15));// print -8
document.write(Math.round(11.65));// print 12

var my_val=11.257;
var my_val=11.254;
document.write(Math.round(my_val*100)/100);
//print 11.25