我正在尝试使用输入范围滑块创建一个审查中心。它们的范围从1到10,每个滑道的侧面显示一个数字,后面跟着/10。JavaScript函数用于将滑块一侧的数字更改为正确的数字。
问题来自平均分函数findaaverage()。当您调整一个滑块时,显示的值([span id="averageScore"] in first [tr])范围从正确值到随机值,如233.5,这是不可能的,因为它是10分之一。当第二个和第三个滑块被调整时,情况就更糟了。
下面是正在运行的页面:http://magnemation.com/games/review_center_test.html
我很想知道为什么会这样,很抱歉缩进。欢呼。
<table>
<tr>
<td>Design</td>
<td>
<input type="range" name="Design" min="0" max="10" step="0.5" onchange="showValue1(this.value)" />
<br>
<br>
</td>
<td align="right" width="22px"> <span id="Design">0</span>
</td>
<td align="left">/10</td>
<td rowspan="3" align="center" width="300px">Total Score:
<br><span id="averageScore" style="font-size: 60px;">0</span>
</td>
</tr>
<script type="text/javascript">
function showValue1(newValue) {
document.getElementById("Design").innerHTML = newValue;
findaverage();
}
</script>
<tr>
<td>Functionality</td>
<td>
<input type="range" name="Functionality" min="0" max="10" step="0.5" onchange="showValue2(this.value)" />
<br>
<br>
</td>
<td align="right" width="22px"> <span id="Functionality">0</span>
</td>
<td align="left">/10</td>
</tr>
<script type="text/javascript">
function showValue2(newValue) {
document.getElementById("Functionality").innerHTML = newValue;
findaverage();
}
</script>
<tr>
<td>Ease of Use</td>
<td>
<input type="range" name="Ease of Use" min="0" max="10" step="0.5" onchange="showValue3(this.value)" />
<br>
<br>
</td>
<td align="right" width="22px"> <span id="Ease of Use">0</span>
</td>
<td align="left">/10</td>
</tr>
<script type="text/javascript">
function showValue3(newValue) {
document.getElementById("Ease of Use").innerHTML = newValue;
findaverage();
}
</script>
<script type="text/javascript">
function findaverage() {
var total = 0;
var average = 0;
total += document.getElementById("Design").innerHTML;
total += document.getElementById("Functionality").innerHTML;
total += document.getElementById("Ease of Use").innerHTML;
average = total / 3;
var rounded = Math.round(average * 2) / 2;
document.getElementById("averageScore").innerHTML = rounded;
}
</script>
您正在连接字符串而不是添加数字。使用parseFloat()将innerHTML字符串转换为可用的数字。
function findaverage() {
var total = 0;
var average = 0;
total += parseFloat(document.getElementById("Design").innerHTML);
total += parseFloat(document.getElementById("Functionality").innerHTML);
total += parseFloat(document.getElementById("Ease of Use").innerHTML);
average = total/3;
var rounded = Math.round(average*2)/2;
document.getElementById("averageScore").innerHTML=rounded;
}