四舍五入的问题

Question

<script>
alert(234234243.345354.toFixed(2));
</script>

Answer 1

参看
http://www.csdn.net/expert/topic/853/853339.xml?temp=.165661

Answer 2

1\
ParseFloat(str).toFixed(2);// 2表示位数2\
<script language=JavaScript>
function tofloat(f,dec) { 
if(dec<0) return "Error:dec<0!"; 
result=parseInt(f)+(dec==0?"":"."); 
f-=parseInt(f); 
if(f==0) 
for(i=0;i<dec;i++) result+='0'; 
else { 
for(i=0;i<dec;i++) f*=10; 
result+=parseInt(Math.round(f)); 
} 
return result; 
} 
alert(tofloat(12.7879888,2))
</script>
3\
<script>
alert(parseInt(12.7879888*100+0.5)/100);
</script>