我想格式化我的数字，总是显示2小数点后，四舍五入适用的地方。
例子:
number display
------ -------
1 1.00
1.341 1.34
1.345 1.35
我一直在用这个:
parseFloat(num).toFixed(2);
但是它把1显示为1，而不是1.00。
当前回答
你可以使用numeric .js。
numeral(1.341).format('0.00') // 1.34
numeral(1.345).format('0.00') // 1.35
其他回答
你在找地板吗?
变量数 = 1.42482; var num2 = 1; var fnum = Math.floor（num）.toFixed（2）; var fnum2 = Math.floor（num2）.toFixed（2）; console.log（fnum + “ 和 ” + fnum2）;两个值均为 1.00
RegExp -替代方法
在输入时，你有字符串(因为你使用解析)，所以我们可以通过只使用字符串操作和整数计算得到结果
let toFix2 = (n) = > n.replace (d / \(?) -(+)。\ \ \ \ d (d + 1) / (_), s, i、d (r) = {> 让k= (+r[0]>=5)+ +d - (r==5 && s=='-'); 返回s +(+i+(k>99)) + "。"(k +(> 99%) ? ? 9: 00”(k≥0 " k " + k)); }) / /测试 console.log toFix2(“1”)); console.log (toFix2 1.341”()); console.log (toFix2 1.345”()); console.log (toFix2 1.005”());
解释
s is sign, i is integer part, d are first two digits after dot, r are other digits (we use r[0] value to calc rounding) k contains information about last two digits (represented as integer number) if r[0] is >=5 then we add 1 to d - but in case when we have minus number (s=='-') and r is exact equal to 5 then in this case we substract 1 (for compatibility reasons - in same way Math.round works for minus numbers e.g Math.round(-1.5)==-1) after that if last two digits k are greater than 99 then we add one to integer part i
<script src="https://code.jquery.com/jquery-3.6.0.js" integrity="sha256-H+K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.mask/1.14.16/jquery.mask.min.js" integrity="sha512-pHVGpX7F/27yZ0ISY+VVjyULApbDlD0/X0rgGbTqCE7WFW5MezNTWG/dnhtbBuICzsd0WQPgpE4REBLv+UqChw==" crossorigin="anonymous"></script>
<input type="text" class = 'item_price' name="price" min="1.00" placeholder="Enter Price" value="{{ old('price') }}" step="">
<script>
$(document).ready(function() {
$('.item_price').mask('00000.00', { reverse: true });
});
</script>
function number_format(string,decimals=2,decimal=',',thousands='.',pre='R$ ',pos=' Reais'){ var numbers = string.toString().match(/\d+/g).join([]); numbers = numbers.padStart(decimals+1, "0"); var splitNumbers = numbers.split("").reverse(); var mask = ''; splitNumbers.forEach(function(d,i){ if (i == decimals) { mask = decimal + mask; } if (i>(decimals+1) && ((i-2)%(decimals+1))==0) { mask = thousands + mask; } mask = d + mask; }); return pre + mask + pos; } var element = document.getElementById("format"); var money= number_format("10987654321",2,',','.'); element.innerHTML = money; #format{ display:inline-block; padding:10px; border:1px solid #ddd; background:#f5f5f5; } <div id='format'>Test 123456789</div>
我是这样解决问题的:
parseFloat(parseFloat(floatString).toFixed(2));
