var n= 2/(1-2/3);alert(Math.Round(n)*1000000000000000/1000000000000000);//要 几 位 , 补 几 个 0
try: function s(n) { var nn = n.toString().split(".")[1].length-1; with(Math) return round(n*pow(10,nn))/pow(10,nn) } alert(s(8/(3-8/3))) alert(s(2/(1-2/3))) alert(s(5/(2-5/3)))
function s(n)
{
var nn = n.toString().split(".")[1].length-1;
with(Math) return round(n*pow(10,nn))/pow(10,nn)
}
alert(s(8/(3-8/3)))
alert(s(2/(1-2/3)))
alert(s(5/(2-5/3)))