Javascript 尝试将数字格式化为 2 个小数位 jQuery
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Trying to format number to 2 decimal places jQuery
提问by benhowdle89
Possible Duplicate:
JavaScript: formatting number with exactly two decimals
可能的重复：
JavaScript：用两位小数格式化数字
Getting a bit muddled up using variables and now cant seem to get calculation to work at all!?
使用变量有点混乱，现在似乎根本无法进行计算！？
$("#discount").change(function(){
var list = $("#list").val();
var discount = $("#discount").val();
var price = $("#price");
var temp = discount * list;
var temp1 = list - temp;
var total = parseFloat($(this).temp1()).toFixed(2);
price.val(total);
});
回答by Andy E
$(this).temp1()looks particularly out of place, I think you just meant to use the temp1variable. Since it's already a number, you don't need to use parseFloaton it either:
$(this).temp1()看起来特别不合适，我想你只是想使用这个temp1变量。由于它已经是一个数字，因此您也不需要使用parseFloat它：
$("#discount").change(function() {
var list = $("#list").val();
var discount = $("#discount").val();
var price = $("#price");
var temp = discount * list;
var temp1 = list - temp;
var total = temp1.toFixed(2);
price.val(total);
});
回答by VinayC
I would suggest you to convert strings to number first before calculation. For example,
我建议您在计算之前先将字符串转换为数字。例如，
var list = parseFloat($("#list").val());
var discount = parseFloat($("#discount").val());
var price = $("#price");
var total = list - (discount * list);
price.val(total.toFixed(2));
Also, if discount is in percentage (for example, say 25) then you have to divide by 100 i.e. list - (discount/100 * list)
此外，如果折扣是百分比（例如，说 25），那么你必须除以 100，即 list - (discount/100 * list)
BTW, refer this SO thread where people had warned against ToFixed usage: How to format a float in javascript?
顺便说一句，请参阅人们警告不要使用 ToFixed 的 SO 线程：How to format a float in javascript?
