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我目前正試圖開發一個簡單的移動應用程序，計算你的BMI，BMR等條件語句忽略
有兩個不同的公式來計算男性和女性的BMR。
對於男性：66+（13.7 *重量）+（5×高度×100） - （6.8×年齡）
對於女性：655+（9.6 *重量）+（1.8×高度×100） - （4.7 *年齡）
問題： 我利用了，如果else語句，因此如果用戶在formpage點擊「男性」單選按鈕，應用程序會識別出用戶是男性，並使用男性BMR公式來計算他的BMR。男性BMR的計算進行得很順利，結果顯示在calculateinput.html頁面
E.g.如果體重= 100，身高= 2，年齡= 18，性別=男性，我會得到2313.6，因爲BMR是正確的。
但是，如果我點擊「女性」單選按鈕，該應用程序仍然使用男性BMR公式，而不是女性BMR公式來計算她的BMR。 如果體重= 100，身高= 2，年齡= 18，性別=女性，我仍然會得到2313.6這是不正確的。
好像我的代碼忽略了用戶的性別輸入和應用男性BMR公式不分性別在表單頁面收音，儘管我的if else語句...
有人能識別並指出什麼錯我做了嗎？ 您的解釋是讚賞！
下面是我在common.js
function bmr(gender, height, weight, age){
var calculatedbmr;
if (gender="male"){
calculatedbmr=66+(13.7 * weight)+(5 * height * 100)-(6.8 * age);
} \t
else if(gender="female"){
calculatedbmr=655+(9.6 * weight)+(1.8 * height * 100)-(4.7 * age); \t
}
return calculatedbmr;
}下面是我的顯示結果頁面代碼的代碼。（名爲calculateinput.html）
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *">
<meta name="format-detection" content="telephone=no">
<meta name="msapplication-tap-highlight" content="no">
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
<link rel="stylesheet" type="text/css" href="css/index.css">
<link rel="stylesheet" href="js/jquery.mobile-1.4.5.min.css">
<script src="js/jquery-1.11.3.min.js"></script>
<script src="js/jquery.mobile-1.4.5.min.js"></script>
<script src="common.js"></script>
<script type="text/javascript">
var mybmi = localStorage.getItem("bmi");
var weightcategory;
if (mybmi<18.5){
\t weightcategory = "Underweight";
}
else if ((mybmi>=18.5)&&(mybmi<=24.99)){
\t weightcategory = "Normal Weight";
}
else if ((mybmi>=25)&&(mybmi<=29.99)){
\t weightcategory = "Overweight";
}
else if ((mybmi>=30)&&(mybmi<=34.99)){
\t weightcategory = "Class 1 Obesity";
}
else if ((mybmi>=35)&&(mybmi<=39.99)){
\t weightcategory = "CLass 2 Obesity";
}
else if (mybmi>=40){
\t weightcategory = "Morbidly Obese";
}
var theloseorgainmessagethatappears = localStorage.getItem("loseorgain");
var theweightdifference = localStorage.getItem("weightdifference");
var thebmrrate = localStorage.getItem("bmrrate");
</script>
</head>
<body>
<div data-role="page" id="mainpage">
\t \t \t <div data-role="header">
\t \t \t \t <a href="#" onclick="home()" class="ui-btn ui-icon-home ui-btn-icon-left">Home</a>
\t \t \t \t <h1>BMI Calculator</h1>
\t \t \t </div> \t
\t \t \t
\t \t \t <div data-role="main" class="ui-content">
\t \t \t <b>Your Results:</b><br><br>
\t \t \t Your weight category: <script>document.write(weightcategory)</script><br><br>
\t \t \t Your BMI is : <script>document.write(mybmi)</script><br><br>
\t \t \t <script>document.write(theloseorgainmessagethatappears)</script><br><br>
\t \t \t Your BMR is : <script>document.write(thebmrrate)</script> <br><br>
\t \t \t
\t \t \t Weight Difference: <script>document.write(theweightdifference)</script>
\t \t \t
\t \t \t </div> \t
\t \t \t
\t \t \t <div data-role="footer" style="text-align:center;">
\t \t \t Developed by The Dom
</div>
\t \t </div>
<script type="text/javascript" src="cordova.js"></script>
<script type="text/javascript" src="js/index.js"></script>
</body>
</html>下面是用戶輸入其輸入的表單頁面上的代碼。
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *">
<meta name="format-detection" content="telephone=no">
<meta name="msapplication-tap-highlight" content="no">
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
<link rel="stylesheet" type="text/css" href="css/projectindex.css">
<link rel="stylesheet" href="js/jquery.mobile-1.4.5.min.css">
<script src="js/jquery-1.11.3.min.js"></script>
<script src="js/jquery.mobile-1.4.5.min.js"></script>
<script src="common.js"></script>
<script type="text/javascript">
function calculate(){
var bmi = bodymassindex(document.bmiform.height.value, document.bmiform.weight.value);
localStorage.setItem("bmi",bmi);
var loseorgain = loseorgainmessage(document.bmiform.weight.value, document.bmiform.dreamweight.value);
localStorage.setItem("loseorgain",loseorgain);
var weightdifference = myweightdifference(document.bmiform.weight.value, document.bmiform.dreamweight.value);
localStorage.setItem("weightdifference",weightdifference);
var bmrrate = bmr(document.bmiform.gender.value, document.bmiform.height.value, document.bmiform.weight.value, document.bmiform.age.value);
localStorage.setItem("bmrrate",bmrrate);
document.bmiform.submit();
} \t \t
</script>
</head>
<body>
<div data-role="page" id="bmicalculator">
<div data-role="header">
<a href="#" onclick="home()" class="ui-btn ui-icon-home ui-btn-icon-left">Home</a>
<h1>BMI Calculator</h1>
</div>
<div data-role="main" class="ui-content">
Enter your height and weight. The system will calculate your BMI:<br><br>
<form id="bmiform" name="bmiform" action="calculateinput.html">
<label for="height">Height</label>
<input type="text" name="height" id="height" value="enter height in meters">
<label for="weight">Weight</label>
<input type="text" name="weight" id="weight" value="enter weight in KG">
<fieldset data-role="controlgroup" data-type="horizontal">
<legend>Gender</legend>
<label for="male">Male</label>
<input type="radio" name="gender" id="male" value="male" checked>
<label for="female">Female</label>
<input type="radio" name="gender" id="female" value="female">
</fieldset>
<label for="dreamweight">Dream Weight</label>
<input type="text" name="dreamweight" id="dreamweight" value="enter dream weight in KG">
<label for="age">Age</label>
<input type="text" name="age" id="age" value="enter age">
<label for="exercisefrequency">Exercise Frequency</label>
<select name="exercisefrequency" id="exercisefrequency">
<option value="hardlyexercise">Hardly Exercise</option>
<option value="exercise1to3timesaweek">Exercise 1 to 3 times a week</option>
<option value="exercise3to5timesaweek">Exercise 3 to 5 times a week</option>
<option value="exercise6to7timesaweek">Exercise 6 to 7 times a week</option>
<option value="intensiveexercisemorethan7timesaweek">Intensive Exercise more than 7 times a week</option>
</select><br>
<input type="button" value="Calculate" onclick="calculate()">
</form>
</div>
<div data-role="footer" style="text-align:center;">
Developed by The Dom
</div>
<script type="text/javascript" src="cordova.js"></script>
<script type="text/javascript" src="js/index.js"></script>
</div>
</body>
</html>
=是賦值，==是比較，===是嚴格比較 –
如果你在內部條件中有錯誤的放置'='和'=='，你也可以使用* yoda條件*表示'「男性= = gender'（相反的條件..而不是'gender ==「male」'），如果您嘗試使用單個'='，則會產生錯誤。但我強烈建議你檢查一下，並學習使其始終成爲例行公事的一部分。幫助：總是認爲是否值得使用'=='或'==='。 tripple意味着嚴格，並且還會檢查像if（false ==='false'）'這樣會忽略內部塊的實例，因爲第二個是字符串而不是布爾值。 –
而不是yoda條件，我會建議使用適當的IDE，將在if語句中的任務中拋出錯誤。 – Cerbrus