[英]What's wrong with my HTML and javascript code?
我想實現一個簡單的測量收斂程序,但轉換按鈕並沒有真正起作用,它甚至沒有改變答案框的值。 我現在該怎么辦?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Measurement Conversion</title>
</head>
<body>
<h1 align="center">
Measurement Conversion
</h1>
<div align="center"><center><table border="0">
<tr>
<input type="text" name="what" size="15">
</tr>
<tr>
<td align="center">From:<br>
<select name="unit" size="9" onChange="convert()">
<option name="meter">meter</option>
<option name="mile">mile</option>
<option name="yard">yard</option>
</select></td>
</tr>
<tr>
<input type="button" onclick="convert()">Convert it now!</button></td>
</tr>
<tr>
<input type="text" name="answer" title="answer" size="70" value="None"></td>
</tr>
</table>
</center></div>
<script>
function convert() {
// var FromVal, ToVal, FromName, ToName, v1;
v1 = document.getElementByName("what").value;
document.getElementByName("answer").value = v1;
var unit = document.getElementByName("unit").name;
if (unit == "yard") {
var meter = "meter= " + 0.9144*document.getElementByName("what").value;
var mile = "mile = " + 0.000568181818*document.getElementByName("what").value;
document.getElementById("answer").value = meter + mile;
}
if (unit == "meter") {
var yard = "yard = " + 1.0936133*document.getElementByName("what").value;
var mile = "mile = " + 0.000621371192*document.getElementByName("what").value;
// var meter = "m = " + 0.9144*document.getElementByName("what").value
document.getElementById("answer").value = yard + mile;
}
if (unit == "mile") {
var meter = "meter = " + 1609.344*document.getElementByName("what").value
var yard = "yard = " + 1760*document.getElementByName("what").value
document.getElementById("answer").value = meter + yard;
}
}
</script>
</body>
</html>
我的convert()
函數似乎有問題。
首先使用最基本的故障排除方法,然后來到這里並提出具體問題以幫助您解決問題如何。 添加alert("button Clicked");
到函數的第一行,看看是否收到警報。 如果這樣做,請將警報移至變量語句之后並將其更改為alert("what = " + what + ", "answer = " + answer + ", unit = " + unit);
並確保您得到什么你期望你的變量賦值。繼續這樣,當你遇到一個你似乎無法解決的特定問題時,回來。
沒有 getElementByName。 在您的輸入上添加屬性 id,然后改用 getElementById。
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