[英]Global variable placement for functions
我目前正在學習一個JavaScript類,並具有以下任務:“設計一個JavaScript程序,要求用戶輸入兩個數字,然后將這兩個數字作為參數傳遞給四個算術函數:加,乘,除和模。函數應將值返回到顯示它們的調用模塊。”
<body>
<h1>Number Functions</h1>
<!-- FORM START -->
<form name="Numbers">
First number:
<br/>
<input type="number" name="number1"/>
<br/>
Second Number:
<br/>
<input type="number" name="number2"/>
<p/>
<input type="button" value="Submit" onclick="showInfo()"/>
<p/>
<textarea rows="8" colspan="150" name="info" readonly="true" value=""></textarea>
</form>
<script type="text/javascript">
function showInfo() {
// Declare and get variables
var firstNumber = parseFloat(document.Numbers.number1.value); // first number
var secondNumber = parseFloat(document.Numbers.number2.value); // second number
// Four mathematical functions
function add(num1, num2) {
var sum = num1 + " + " + num2 + " = " + (num1+num2).toFixed(2) + "\n";
return sum;
}
function multiply(num1, num2) {
var product = num1 + " \u00d7 " + num2 + " = " + (num1*num2).toFixed(2) + "\n";
return product;
}
function divide(num1, num2) {
var dividend = num1 + " / " + num2 + " = " + (num1/num2).toFixed(2) + "\n";
return dividend;
}
function modulus(num1, num2) {
var surplus = num1 + " % " + num2 + " = " + (num1%num2).toFixed(2);
return surplus;
}
var total = add(firstNumber,secondNumber) + multiply(firstNumber,secondNumber) + divide(firstNumber,secondNumber) + modulus(firstNumber,secondNumber);
document.Numbers.info.value = total;
// I need this function to get the results from the four above and put them in the textarea!
}
</script>
</body>
我不確定要如何獲取這四個函數的結果並顯示結果,但我確實懷疑我的代碼無法正常工作的許多原因是由於變量放置不正確。 這是在線課程,課本太可怕了! 因此,如果您可以向我指出正確的方向(或多個正確的方向),那就太好了。
這有很多問題。
試試這樣的小提琴: https : //jsfiddle.net/oLb1vzrb/
// Four mathematical functions
function add(num1, num2) {
return num1 + " + " + num2 + " = " + (num1 + num2).toFixed(2);
}
function multiply(num1, num2) {
return num1 + " \u00d7 " + num2 + " = " + (num1 * num2).toFixed(2);
}
function divide(num1, num2) {
return num1 + " / " + num2 + " = " + (num1 / num2).toFixed(2);
}
function modulus(num1, num2) {
return num1 + " % " + num2 + " = " + (num1 % num2).toFixed(2);
}
function showInfo() {
// Declare and get variables
var num1 = parseFloat(document.Numbers.number1.value); // first number
var num2 = parseFloat(document.Numbers.number2.value); // second number
document.Numbers.info.value = add(num1, num2) + multiply(num1, num2) + divide(num1, num2) + modulus(num1, num2);
}
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