javascript ÀàÐÍÎÊÌâ

function totalPrice(id){
var price=document.getElementById("inprice"+id).value;

var num= document.getElementById("inadd"+id).value;
if(!(isNaN(price)||isNaN(num))){
sum=price*num;
document.getElementById("totalprice"+id).value=sum;
}else{
alert("ÇëÊäÈëÊý¾Ý£¡");
}
}

//
¼ÙÈçprice=7.6,num=7 sum=53.1999999999999999;

ʵ¼ÊÒªµÃµ½µÄÊÇ53.2£¬Õâ¸ÃÔõô½â¾ö°¡£¿

---

document.getElementById("totalprice"+id).value=sum.toFixed(1);

---

JScript code:
function cheng(num,n)
{var dd=1;
var tempnum;
for(i=0;i<n;i++)
{
dd*=10;
}
tempnum=num*dd;
tempnum=Math.round(tempnum);
alert(tempnum/dd);
}
ÀïÃæµÄÁ½¸ö²ÎÊý£ºnum¾ÍÊÇҪת»»µÄÊý¾Ý¡£nΪҪת»»µÄλÊý
---------------------------------------------------------------

/*
* ForDight(Dight,How):ÊýÖµ¸ñʽ»¯º¯Êý£¬DightÒª
* ¸ñʽ»¯µÄ Êý×Ö£¬HowÒª±£ÁôµÄСÊýλÊý¡£
*/
function ForDight(Dight,How)
{
Dight = Math.round (Dight*Math.pow(10,How))/Math.pow(10,How);
return Dight;
}
alert(ForDight(12345.67890,2));


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