不知道我的简单代码怎么了
[英]Not sure what's wrong with my simple code
问题描述
I am unsure of what I have done wrong in my simple sales tax calculator. 
我不确定我在简单的营业税计算器中做错了什么。 When I press submit I want a dollar amount of the item cost plus sales tax to be shown but instead I see total tip $functionround(){[native code]} . 当我按Submit时，我想要显示项目成本加营业税的美元金额，但我看到的total tip $functionround(){[native code]}
//calculation
var total = (itemCost * salesTax + itemCost);
total = Math.round
3 个解决方案
解决方案1
1 2019-07-02 01:41:15
total = Math.round
In the line above you are assigning the value of the function Math.round to the variable total. 在上面的行中，您正在将函数Math.round的值分配给变量total。 Instead you probably want to assign the value returned by the function Math.round to your total variable like this: 相反，您可能想将Math.round函数返回的值分配给您的总变量，如下所示：
total = Math.round(total)
解决方案2
0 2019-07-02 02:05:36
As noted you need to return the total of hte Math.round - but you also need to parse the values into numbers) and then you also have to remember that the sales tax is a percentage - so it has to be divided by 100. 如前所述，您需要返回Math.round的总数-但还需要将这些值解析为数字），然后还必须记住营业税是一个百分比-因此必须除以100。
I have amended your logic to 我已将您的逻辑修改为
a) parse the values of the inputs into numbers using parseInt() a）使用parseInt（）将输入的值解析为数字
b) resolve the math.round() issue b）解决math.round（）问题
c) get the sales tax value by multiplying the item cost by the sales tax percentage ... itemCost * (salesTax/100) c）通过将项目成本乘以销售税百分比... itemCost *（salesTax / 100）来获得销售税值
d) add the sales tax value to the item cost ... item cost + (itemCost * (salesTax/100))... d）将营业税值添加到物料成本...物料成本+（itemCost *（salesTax / 100））...
//Function function calculateTip() { var itemCost = parseInt(document.getElementById("itemCost").value); var salesTax = parseInt(document.getElementById("salesTax").value); //enter values window if (itemCost === "" || salesTax == "") { window.alert("Please enter the values!"); return; } //calculation var total = Math.round(itemCost + (itemCost * salesTax/100)); //display amount document.getElementById("totalTip").style.display = "block"; document.getElementById("amount").innerHTML = total; } //Hide Tip Amount and call our function with a button document.getElementById("totalTip").style.display = "none"; document.getElementById("submit").onclick = function() { calculateTip(); };
</head> <body id="color"> <div class="container" id="contain"> <div class="text-center"> <h1>Sales Tax Calculator</h1> <p> Amount Before Tax?</p> $ <input id="itemCost" type="text" placeholder="item cost"> <p>Sales Tax Percentage?</p> <input id="salesTax" type="text" placeholder="sales tax percent"><br><br> <button type="submit" id="submit">submit</button> </div> <div class="container" ID="totalTip"> <div class="text-center"> <p>Total Tip</p> <sup>$</sup><span id="amount">0.00</span> </div> </div> </div> <script type="text/javascript" src="javascript.js"></script> </body>
解决方案3
0 2019-07-02 02:09:07
You should consider those codes on the calculation . 您应该在calculation考虑这些代码。 Here is a simple tax calculator and it works well: 这是一个简单的税收计算器，效果很好：
function fmtPrice(value) { result="$"+Math.floor(value)+"."; var cents=100*(value-Math.floor(value))+0.5; result += Math.floor(cents/10); result += Math.floor(cents%10); return result; } function compute() { var unformatted_tax = (document.forms[0].cost.value)*(document.forms[0].tax.value); document.forms[0].unformatted_tax.value=unformatted_tax; var formatted_tax = fmtPrice(unformatted_tax); document.forms[0].formatted_tax.value=formatted_tax; var cost3= eval( document.forms[0].cost.value ); cost3 += eval( (document.forms[0].cost.value)*(document.forms[0].tax.value) ); var total_cost = fmtPrice(cost3); document.forms[0].total_cost.value=total_cost; } function resetIt() { document.forms[0].cost.value="19.95"; // cost of product document.forms[0].tax.value=".06"; // tax value document.forms[0].unformatted_tax.value=""; document.forms[0].formatted_tax.value=""; document.forms[0].total_cost.value=""; }
<CENTER> <FORM> <TABLE BORDER=2 WIDTH=300 CELLPADDING=3> <TR> <TD align="center"><FONT SIZE=+1><STRONG>Cost</STRONG></FONT> <TD align="center"><FONT SIZE=+1><STRONG>Tax</STRONG></FONT> </TR> <TR> <TD align="center"><INPUT TYPE="text" NAME="cost" VALUE="19.95" SIZE=10> <TD align="center"><INPUT TYPE="text" NAME="tax" VALUE=".06" SIZE=10> </TR> </TABLE> <BR> <TABLE BORDER=1 WIDTH=600 CELLPADDING=3> <TR> <TD align="center"><FONT SIZE=+1><STRONG>Unformatted Tax</STRONG></FONT> <TD align="center"><FONT SIZE=+1><STRONG>Formatted Tax</STRONG></FONT> <TD align="center"><FONT SIZE=+1><STRONG>TOTAL COST</STRONG></FONT> </TR> <TR> <TD align="center"><INPUT TYPE="text" NAME="unformatted_tax" SIZE=15> <TD align="center"><INPUT TYPE="text" NAME="formatted_tax" SIZE=15> <TD align="center"><INPUT TYPE="text" NAME="total_cost" SIZE=15> </TR> </TABLE> <BR> <TABLE BORDER=0 WIDTH=400 CELLPADDING=5> <TR> <TD align="center"><INPUT TYPE="reset" VALUE="RESET" onClick="resetIt()"> <TD align="center"><INPUT TYPE="button" VALUE="COMPUTE" onclick="compute()"> </TR> </TABLE> </CENTER>
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