JS保留⼩数点（四舍五⼊、四舍六⼊）实例<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>floatDecimal.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; chart=gb2312">
<script type="text/javascript">
//保留两位⼩数
//功能：将浮点数四舍五⼊，取⼩数点后2位
function toDecimal(x) {
var f = parFloat(x);
if (isNaN(f)) {
return;
}
f = und(x*100)/100;
return f;
}国清寺
//制保留2位⼩数，如：2，会在2后⾯补上00.即2.00
function toDecimal2(x) {
var f = parFloat(x);
if (isNaN(f)) {
return fal;
}
var f = und(x*100)/100;
寻龙之旅var s = f.toString();
var rs = s.indexOf('.');
if (rs < 0) {
rs = s.length;
s += '.';
}
while (s.length <= rs + 2) {
苍黄翻复s += '0';
}
return s;
}
function fomatFloat(src,pos){
und(src*Math.pow(10, pos))/Math.pow(10, pos);
}
//四舍五⼊
document.writeln("保留2位⼩数：" + toDecimal(3.14159267) + '<br/>');
document.writeln("强制保留2位⼩数：" + toDecimal2(3.14159267) + '<br/>');
document.writeln("保留2位⼩数：" + toDecimal(3.14559267) + '<br/>');
document.writeln("强制保留2位⼩数：" + toDecimal2(3.15159267) + '<br/>');
预备党员思想汇报格式
document.writeln("保留2位⼩数：" + fomatFloat(3.14559267, 2) + '<br/>');
document.writeln("保留1位⼩数：" + fomatFloat(3.15159267, 1) + '<br/>');
//五舍六⼊
document.writeln("保留2位⼩数：" + Fixed(2) + '<br/>');
document.writeln("保留1位⼩数：" + Fixed(1) + '<br/>');
document.writeln("保留1位⼩数：" + Fixed(1) + '<br/>');
document.writeln("保留1位⼩数：" + Fixed(1) + '<br/>');
//科学计数
提高服务意识
document.writeln(Exponential(2) + '<br/>');
document.writeln(Exponential(2) + '<br/>');
document.writeln(Exponential(2) + '<br/>');
document.writeln(Exponential(2) + '<br/>');
document.writeln(Exponential(1) + '<br/>');
//精确到n位，不含n位
document.writeln("精确到⼩数点第2位" + Precision(2) + '<br/>');
document.writeln("精确到⼩数点第3位" + Precision(3) + '<br/>');
document.writeln("精确到⼩数点第2位" + Precision(2) + '<br/>');
document.writeln("精确到⼩数点第2位" + Precision(2) + '<br/>');
document.writeln("精确到⼩数点第5位" + Precision(5) + '<br/>');职称论文怎么写
</script>
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