javasript实现第三位小数四舍五入

var expensevalue = (document.getElementById("edt_0_Expense").value).toString()

point = expensevalue.indexOf(".");

//edt_0_Expense.value;

last = point + 2;

round = point + 3;

lastvalue = parseInt(expensevalue.substr(last,1));

if (parseInt(expensevalue.substr(round,1)) >= 5)

lastvalue = parseInt(expensevalue.substr(last,1)) + 1;

expensevalue = expensevalue.substr(0, last) + lastvalue.toString();

第三位小数四舍五入

或者用库函数

newexpensevalue= parseFloat(Math .round (expensevalue*100))/100;