页面应该输出并执行一个温度转换器...
但是， 当我想测试我的程序时，我一直遇到这个空白页类型错误...... 有人可以读一下这个证明吗，因为我不知道我错过了什么。
"use strict";
var $ = function(id) { return document.getElementById(id); };
var convertTemp = function(){
var f;
var c;
if($("to_Celsius").checked){
f = parseFloat($("degrees_entered").value);
if(isNaN(f)){
alert("please type in a value ");
}
else{
c = (f-32) * 5/9;
$("degrees_computed").value = c.toFixed(0);
}
}
else{
c = parseFloat($("degrees_entered").value);
if(isNaN(c)){
alert("you must enter a valid number for degrees.");
}
else{
f = c * 9/5 + 32;
$("degrees_computed").value = f.toFixed(0);
}
}
};
var toFahrenheit = function(){
$("degree_label_1").firstChild.nodeValue = "Enter C degrees:";
$("degree_label_2").firstChild.nodeValue = "Degrees F";
clearTextBoxes();
$("degrees_entered").focus();
};
var toCelsius = function(){
$("degree_label_1").firstChild.nodeValue = "Enter F degrees: ";
$("degree_label_2").firstChild.nodeValue = "Degrees C: ";
clearTextBoxes();
$("degrees_entered").focus();
};
var clearTextBoxes = function(){
$("degrees_entered").value = "";
$("degrees_computed").value = "";
};
window.onload = function(){
$("convert").onclick = convertTemp;
$("to_Celsius").onclick != toCelsius;
$("to_Fahrenheit").onclick = toFahrenheit;
$("degrees_entered").focus();
};body {
font-family: Arial, Helvetica, sans-serif;
background-color: white;
margin: 0 auto;
width: 450px;
border: 3px solid blue;
}
h1 {
color: blue;
margin: 0 0 .5em;
}
main {
padding: 1em 2em;
}
label {
float: left;
width: 10em;
margin-right: 1em;
}
input {
margin-bottom: .5em;
}
#convert {
width: 10em;
}<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Convert Temperatures</title>
<link rel="stylesheet" href="styles.css">
<script src="convert_temp.js"></script>
</head>
<body>
<main>
<h1>Convert temperatures</h1>
<input type="radio" name="conversion_type" id="to_celsius" checked>Fahrenheit to Celsius<br>
<input type="radio" name="conversion_type" id="to_fahrenheit">Celsius to Fahrenheit<br><br>
<label id="degree_label_1">Enter F degrees:</label>
<input type="text" id="degrees_entered" ><br>
<label id="degree_label_2">Degrees Celsius:</label>
<input type="text" id="degrees_computed" disabled><br>
<label> </label>
<input type="button" id="convert" value="Convert" /><br>
</main>
</body>
</html>最佳答案
toCelcius != toCelsius ?
是吗？一个愚蠢的错字？其余的看起来不错……还有 watch 外壳。在您的 JS 中，您有 to_Celsius...但是在 html 中...to_celcius...肯定是个坏习惯
关于javascript - 事件处理程序，损坏的页面，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42127724/