这是我的代码到目前为止.我想知道如何以小数点后两位返回答案. EX.而不是515.3我想要515.30或者不是500我希望它返回500.00.
<HTML>
<HEAD>
<TITLE>Simple Adder</TITLE>
<SCRIPT LANGUAGE="JavaScript">
function CalculateSum(Atext,form)
{
var A = parseFloat(Atext);
form.Answer.value = A * .03+.30+A;
}
function ClearForm(form)
{
form.input_A.value = "";
form.Answer.value = "";
}
// end of JavaScript functions -->
</SCRIPT>
</HEAD>
<BODY>
<P><FONT SIZE="+2">Credit Card Payment Calculator</FONT></P>
<FORM NAME="Calculator" METHOD="post">
<P>Enter Base Rent: <INPUT TYPE=TEXT NAME="input_A" SIZE=10></P>
<P><INPUT TYPE="button" VALUE="Calculate Rent & Fees Payment" name="AddButton" onClick="CalculateSum(this.form.input_A.value,this.form)"></P>
<P><INPUT TYPE="button" VALUE="Clear Fields" name="ClearButton" onClick="ClearForm(this.form)"></P>
<P>Final Amount = <INPUT TYPE=TEXT NAME="Answer" SIZE=12></P>
</FORM>
</BODY>
</HTML>
解决方法
使用
Number.prototype.toFixed.例如：
var a = 515.3; alert(a.toFixed(2));
请注意,这会将数字转换为字符串,因此仅使用它来显示给用户.