以下代码,输入框D得到的值,如何四舍五入取小数后两位???

Question

IE5.5+
<script>
function roundnumber(str,number){
return Number(str).toFixed(number)
}
alert(roundnumber("1",2))
alert(roundnumber("1.2",2))
alert(roundnumber("1.215",2))
</script>
otherwise
<script>
function roundnumber(str,number){
if(number<1)return Number(str)
var tmp=Math.pow(10,number)
var ret=String(Math.round(Number(str)*tmp)/tmp)
if(ret.indexOf(".")==-1)ret+="."
ret+=new Array(number+2+ret.indexOf(".")-ret.length).join("0")
return ret;
}
alert(roundnumber("1",2))
alert(roundnumber("1.2",2))
alert(roundnumber("1.215",2))
</script>

Answer 1

或者用vbs的formatnumber，下面的帖子重复了，建议在别人回复前删除
http://expert.csdn.net/expert/Topicview1.asp?id=1443348

Answer 2

用javascript1\
ParseFloat(str).toFixed(2);// 2表示位数2、
<script>
alert(parseInt(12.7879888*100+0.5)/100);
</script>

Answer 3

<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>