为什么js中运行出现运算不正确

Question

页面显示
单价        139.3
询价数量     3.0
总价         417.90000000000003
js代码
var varUnitPrice=document.getElementById("mpsProjectQuoted.unitPrice").value;
var varQuantity=document.getElementById("inquiryNumber").value;
document.getElementById("mpsProjectQuoted.totalPrice").value=varUnitPrice*varQuantity;
为什么总价会这样  请问大家遇到过吗  有什么解决方案没

Answer 1

document.getElementById("mpsProjectQuoted.totalPrice").value=Math.round(varUnitPrice*varQuantity*100)/100;

Answer 2

= Math.round(varUnitPrice*varQuantity*100)/100;

Answer 3

document.getElementById("mpsProjectQuoted.totalPrice").value = parseInt(varUnitPrice)*parseInt(varQuantity);

Answer 4

楼主保留两位小数点吧var varUnitPrice=document.getElementById("mpsProjectQuoted.unitPrice").value;
var varQuantity=document.getElementById("inquiryNumber").value;
var totalPrice = varUnitPrice * varQuantity + "";
totalPrice = totalPrice.match(/\d+\.\d{2}/);
document.getElementById("mpsProjectQuoted.totalPrice").value=totalPrice;

Answer 5

toFixed即可
document.getElementById("mpsProjectQuoted.totalPrice").value= (varUnitPrice*varQuantity).toFixed(2);//2位小数