Javascript 修剪为 2 位小数
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trim to 2 decimals
提问by user821522
I have:
我有：
onclick="document.getElementById('field1').value =
Math.round((parseFloat(document.getElementById('field2').value,2)*100))/100 +
Math.round((parseFloat(document.getElementById('field3').value,2)*100))/100;"
Most numbers round ok to 2 decimal points which is what I need.
大多数数字可以四舍五入到 2 个小数点，这正是我所需要的。
However, with an example like
但是，举个例子
onclick="document.getElementById('field1').value =
Math.round((parseFloat(document.getElementById('21.29').value,2)*100))/100 +
Math.round((parseFloat(document.getElementById('54.70').value,2)*100))/100;"
Field 1 is returning 75.99000000000001How can I trim to 75.99consistently?
字段 1 正在返回75.99000000000001我如何才能75.99始终保持一致？
回答by Bobby Borszich
var num = 5 / 6;
var display = num.toFixed(2)
num outputs: 0.8333333333333334
display outputs: "0.83"
回答by Michael Berkowski
Use the method toFixed(2)to fix it at 2 decimal places:
使用方法toFixed(2)将其固定在小数点后两位：
(Math.round((parseFloat(document.getElementById('21.29').value,2)*100))/100 +
Math.round((parseFloat(document.getElementById('54.70').value,2)*100))/100).toFixed(2);
回答by Sean McMains
How about this:
这个怎么样：
parseFloat(document.getElementById('21.29').toFixed(2));
The toFixed method should take care of the rounding nicely for you.
toFixed 方法应该很好地为您处理舍入。
回答by Abdeali Chandanwala
I had a similar issue - where I do not wanted to round the value but trim upto 2 decimals
我有一个类似的问题 - 我不想四舍五入该值但修剪到 2 位小数
I got the perfect solution for by writing this function and using where ever needed to trim upto 2 decimals
通过编写此函数并使用需要修剪至 2 位小数的地方，我得到了完美的解决方案
function upto2Decimal(num) {
if (num > 0)
return Math.floor(num * 100) / 100;
else
return Math.ceil(num * 100) / 100;
}
if you call
如果你打电话
upto2Decimal(2.3699) or upto2Decimal(-2.3699)
// returns 2.36 or -2.36
check this solution using your JS console of the browser
使用浏览器的 JS 控制台检查此解决方案
