Copy Code code as follows:
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
<title>floatDecimal.html</title>
<meta http-equiv= "keywords" content= "keyword1,keyword2,keyword3" >
<meta http-equiv= "description" content= "This are my page" >
<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 ">
<script type= "Text/javascript" >
Keep two decimal digits
Function: Rounding floating-point numbers, taking 2 digits after the decimal point
function ToDecimal (x) {
var f = parsefloat (x);
if (isNaN (f)) {
Return
}
f = Math.Round (x*100)/100;
return F;
}
The system retains 2 decimal places, such as: 2, will be 00 after 2. That is 2.00
function ToDecimal2 (x) {
var f = parsefloat (x);
if (isNaN (f)) {
return false;
}
var f = math.round (x*100)/100;
var s = f.tostring ();
var rs = s.indexof ('. ');
if (Rs < 0) {
rs = s.length;
s + = '. ';
}
while (s.length <= RS + 2) {
s + + ' 0 ';
}
return s;
}
function Fomatfloat (src,pos) {
Return Math.Round (Src*math.pow, POS))/math.pow (POS);
}
Rounded
Document.writeln ("Retain 2 decimal places:" + todecimal (3.14159267) + ' <br/> ');
Document.writeln ("Mandatory retention of 2 decimal places:" + toDecimal2 (3.14159267) + ' <br/> ');
Document.writeln ("Retain 2 decimal places:" + todecimal (3.14559267) + ' <br/> ');
Document.writeln ("Mandatory retention of 2 decimal places:" + toDecimal2 (3.15159267) + ' <br/> ');
Document.writeln ("Retain 2 decimal places:" + fomatfloat (3.14559267, 2) + ' <br/> ');
Document.writeln ("Retain 1 decimal places:" + fomatfloat (3.15159267, 1) + ' <br/> ');
Five homes six into
Document.writeln ("Retain 2 decimal places:" + 1000.003.toFixed (2) + ' <br/> ');
Document.writeln ("Retain 1 decimal places:" + 1000.08.toFixed (1) + ' <br/> ');
Document.writeln ("Retain 1 decimal places:" + 1000.04.toFixed (1) + ' <br/> ');
Document.writeln ("Retain 1 decimal places:" + 1000.05.toFixed (1) + ' <br/> ');
Scientific count
Document.writeln (3.1415.toExponential (2) + ' <br/> ');
Document.writeln (3.1455.toExponential (2) + ' <br/> ');
Document.writeln (3.1445.toExponential (2) + ' <br/> ');
Document.writeln (3.1465.toExponential (2) + ' <br/> ');
Document.writeln (3.1665.toExponential (1) + ' <br/> ');
Accurate to n-bit, excluding n-bit
Document.writeln ("Accurate to decimal point 2nd" + 3.1415.toPrecision (2) + ' <br/> ');
Document.writeln ("Accurate to decimal point 3rd" + 3.1465.toPrecision (3) + ' <br/> ');
Document.writeln ("Accurate to decimal point 2nd" + 3.1415.toPrecision (2) + ' <br/> ');
Document.writeln ("Accurate to decimal point 2nd" + 3.1455.toPrecision (2) + ' <br/> ');
Document.writeln ("Accurate to decimal point 5th" + 3.141592679287.toPrecision (5) + ' <br/> ');
</script>
<body>
This is my HTML page. <br>
</body>
JavaScript rounding retains two decimal places
Copy Code code as follows:
function count () {
Alert ("Count");
var size=~~ (document.getElementById ("size"). Value);
var value=0;
for (Var i=0;i<size;i++) {
var val=1* (document.getElementById ("Afteradjscor" +i). Value);
if (null!=val) {
Value =math.round ((1* (value+val)) *100)/100;
}
}
if (isNaN (value)) {
Value= "Input must be a numeric type";
}
document.getElementById ("Total"). Value=value;
}
Description: ~~xx: String int
1*xx: String float
Math.Round ((1* (value+val)) *100)/100: Rounding
