Javascript和HTML表单 - 用一种形式创建两个函数

Question

你能帮忙吗？我现在有一个表格，它将第1,2和3框中的内容放在一起，并将它们放大并给出答案。我有一个单独的函数和形式，可以减去框4-11（正如您从代码中看到的那样）。我需要帮助的是创建一个函数，它可以使用第二个函数并从第一个函数中减去它。

如果有助于解释我在做什么，第一个函数将计算总收入。第二个计算的负支出，但现在我不知道如何从总额中减去支出？

基本上 - 我有答案A（毛）的函数。我有答案B（费用）的功能。但是，我如何从A中减去B？

任何帮助将是伟大的！

<script language="javascript" type="text/javascript"> 
function runGross(grossForm) { 

var field1 = Number(grossForm.box1.value); 

var field2 = Number(grossForm.box2.value); 

var field3 = Number(grossForm.box3.value); 

grossForm.total.value = '$' + field1*field2*field3; 

} 

function runTotal(totalForm) { 

var field4 = Number(totalForm.box4.value); 

var field5 = Number(totalForm.box5.value); 

var field6 = Number(totalForm.box6.value); 

var field7 = Number(totalForm.box7.value); 

var field8 = Number(totalForm.box8.value); 

var field9 = Number(totalForm.box9.value); 

var field10 = Number(totalForm.box10.value); 

var field11 = Number(totalForm.box11.value); 

totalForm.total.value = field4-field5-field6-field7-field8-field9-field10-field11; 

} 

</script> 


<h1>How Much Can You Make as Counselor in Private Practice?</h1> 
<h2><span style="color: #339966;">Adding the Total Gross Revenue</span></h2> 
Use an average of cash clients and various payers. Remember, that insurance pays a little more for first appointments, and couples counseling/family therapy. 

<form><span style="color: #339966;"><strong>Revenue Per Session</strong></span>: <input type="text" name="box1" size="10" maxlength="20" placeholder="Avg 50-150" /> 
<br/><br/> 
30-35 sessions a week is traditionally fulltime. Some clinicians work more, some work less. 
<br/> 
<span style="color: #339966;"><strong>Sessions Per Week:</strong></span><input type="text" name="box2" size="10" maxlength="20" placeholder="Avg. 30-35"/> 
<br/> 
<br/> 
Recommended: 48 weeks per year. That allows for 4 weeks off per year. 
<br/> 
<span style="color: #339966;"><strong>Weeks Per Year</strong>:</span> <input type="text" name="box3" size="10" maxlength="20" placeholder="Avg. 48-50" /> 
<br/> 
<br/> 
<strong><span style="color: #339966;">Your Total Gross Revenue:</span> </strong> 

<input onclick="runGross(this.form)" type="button" value="Calculate My Gross Revenue" /> 
<input type="text" name="total" size="10" maxlength="20" /> 

</form> 


<h2><span style="color: #ff0000;">Subtracting the Expenses</span></h2> 
Remember to include heat, electric, water, and Internet (if applicable). 

<form><span style="color: #ff0000;"><strong>Rent & Utilities (per year):</strong></span> <input type="text" name="box4" size="10" maxlength="20" /> 
<br/> 
<br/> 
Some providers in private practice spend around 7% of revenue. Others spend 0%. 
<br/> 
<span style="color: #ff0000;"><strong>Marketing:</strong></span><input type="text" name="box5" size="10" maxlength="20" /> 
<br/> 
<br/> 
Will you hire a billing company (calculate 5% of revenue)? Accept credit cards (calculate 2% of revenue)? 
<br/> 
<span style="color: #ff0000;"><strong>Medical Billing</strong>:</span> <input type="text" name="box6" size="10" maxlength="20" /> 
<br/> 
<br/> 
These can be under $300 a year if you’re frugal, or thousands if you plan to attend conferences. 
<br/> 
<span style="color: #ff0000;"><strong>CEUs and Association Fees:</strong></span> <input type="text" name="box7" size="10" maxlength="20" /> 
<br/> 
<br/> 
Professional Liability insurance is approx $150-$350 a year. 
<br/> 
<span style="color: #ff0000;"><strong>Insurance:</strong></span> <input type="text" name="box8" size="10" maxlength="20" /> 
<br/> 
<br/> 
For a solo-practice, can be around $2500 a year. 
<br/> 
<span style="color: #ff0000;"><strong>Office Expenses:</strong></span> <input type="text" name="box9" size="10" maxlength="20" /> 
<br/> 
<br/> 

Approx $500 a year for Legal Expenses. 
<br/> 
<span style="color: #ff0000;"><strong>Accounting and Legal:</strong></span> <input type="text" name="box10" size="10" maxlength="20" /> 
<br/> 
<br/> 
Estimate another $1500 for the unexpected! 
<br/> 
<span style="color: #ff0000;"><strong>Misc. Expenses:</strong></span> <input type="text" name="box11" size="11" maxlength="20" /> 
<br/> 
<br/> 

<strong><span style="color: #339966;">Your Total Pre-Tax (Pre-Tax):</span> </strong> 

<strong></strong><input onclick="runTotal(this.form)" type="button" value="Calculate My Total" /> 
<input type="text" name="total" size="20" maxlength="20" /> 

</form> 

Answer 1

我认为，如果你有你的职能，将工作返回值，就像这样：

var runGross = function (grossForm) 
{ 
    //contents here 

    return grossForm.total.value; 
} 

和

var runTotal = function (totalForm) 
{ 
    //contents here 

    return totalForm.total.value; 
} 

然后如果你想另一个函数找到差异：

var findProfit = function (runGross, runTotal) 
{ 
    return runGross - runTotal; 
}