点击+和-，我想显示增量和减量数字。我该怎么做？谢谢:)）
这是我的代码 - ＆gt;
var minutes = 25,
seconds = 0,
isPaused = true,
timerId = 0,
remainingTime,
countdownHandle,
plus = document.getElementByClassName('plus');
show = document.getElementByClassName('value');
function plus(){
$('.plus').on('click', function(){
minutes++;
$('.value').html(minutes);
});
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<div class="control-wrapper" id="session">
<div class="control-header">SESSION LENGTH</div>
<div class="control">
<div class="plus">+</div>
<div class="value">25</div>
<div class="minus">-</div>
</div>
</div>
答案 0 :(得分：1)
document.querySelector(".plus")，但目前你的代码中根本没有使用vars plus或show $function() {... });而不是您不打电话的功能。它在页面加载并且您的元素存在时执行show不在var中，因为你在前一行之一上有分号
var minutes = 25,
seconds = 0,
isPaused = true,
timerId = 0,
remainingTime,
countdownHandle;
$(function() { // on page load
$('.plus').on('click', function(){
minutes++;
$('.value').html(minutes);
});
$('.minus').on('click', function(){
minutes--;
$('.value').html(minutes);
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<div class="control-wrapper" id="session">
<div class="control-header">SESSION LENGTH</div>
<div class="control">
<div class="plus">+</div>
<div class="value">25</div>
<div class="minus">-</div>
</div>
</div>
答案 1 :(得分：0)
我尽可能少地修改你的代码以使其正常工作。
var minutes = 25,
seconds = 0,
isPaused = true,
timerId = 0,
remainingTime,
countdownHandle,
plus = document.querySelector('.plus'),
show = document.querySelector('.value');
$('.plus').on('click', function() {
minutes++;
$('.value').html(minutes);
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<div class="control-wrapper" id="session">
<div class="control-header">SESSION LENGTH</div>
<div class="control">
<button class="plus">+</button>
<div class="value">25</div>
<button class="minus">-</button>
</div>
</div>
答案 2 :(得分：0)
您可以使用解决方案
$('.plus').click(function(){
$('.value').html(parseInt($('.value').text()) + 1);
});
$('.minus').click(function(){
$('.value').html(parseInt($('.value').text()) - 1);
});.plus, .minus {
cursor: pointer;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="control-wrapper" id="session">
<div class="control-header">SESSION LENGTH</div>
<div class="control">
<div class="plus">+</div>
<div class="value">25</div>
<div class="minus">-</div>
</div>
</div>
希望这会对你有所帮助。
答案 3 :(得分：0)
使用jquery简单
1>------ Derleme başladı: Proje: Dokuza, Yapılandırma: Debug Any CPU ------
1> Dokuza -> C:\Users\seher\OneDrive\Belgeler\visual studio 2017\Projects\Dokuza\Dokuza\bin\Debug\Dokuza.dll
1> Processing: obj\Debug\res\layout\main.xml
1> Processing: obj\Debug\res\values\strings.xml
1> Processing: obj\Debug\res\layout\main.xml
1> Processing: obj\Debug\res\values\strings.xml
2>VisualStudio_android-23_x86_phone dağıtmayı başlat ...
2>VisualStudio_android-23_x86_phone öykünücüsü başlatılıyor...
2>C:\PROGRA~2\Android\ANDROI~1\tools\emulator.EXE -partition-size 512 -no-boot-anim -avd VisualStudio_android-23_x86_phone -prop monodroid.avdname=VisualStudio_android-23_x86_phone
2>Hax is enabled
2>Hax ram_size 0x40000000
2>HAX is working and emulator runs in fast virt mode.
2>emulator: Listening for console connections on port: 5554
2>emulator: Serial number of this emulator (for ADB): emulator-5554
2>VisualStudio_android-23_x86_phone öykünücüsü çalışıyor.
2>Öykünücünün hazır olması bekleniyor...
2>...
2>VisualStudio_android-23_x86_phone dağıtılıyor...
2>Oluşturma başlatıldı.
2>"Dokuza.csproj" projesi (Install hedef):
2>C:\Program Files\Java\jdk1.8.0_131\\bin\keytool.exe -list -alias androiddebugkey -storepass android -keypass android -keystore "C:\Users\seher\AppData\Local\Xamarin\Mono for Android\debug.keystore"
2>C:\Program Files\Java\jdk1.8.0_131\\bin\jarsigner.exe -keystore "C:\Users\seher\AppData\Local\Xamarin\Mono for Android\debug.keystore" -storepass android -keypass android -digestalg SHA1 -sigalg md5withRSA -signedjar bin\Debug\\Dokuza.Dokuza-Signed-Unaligned.apk "C:\Users\seher\OneDrive\Belgeler\visual studio 2017\Projects\Dokuza\Dokuza\obj\Debug\android\bin\Dokuza.Dokuza.apk" androiddebugkey
2>No -tsa or -tsacert is provided and this jar is not timestamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's expiration date (2047-09-14) or after any future revocation date.
2>C:\Program Files (x86)\Android\android-sdk\build-tools\23.0.3\zipalign.exe 4 "C:\Users\seher\OneDrive\Belgeler\visual studio 2017\Projects\Dokuza\Dokuza\bin\Debug\Dokuza.Dokuza-Signed-Unaligned.apk" "bin\Debug\\Dokuza.Dokuza-Signed.apk"
2>device 'emulator-5554' not found
2>"Dokuza.csproj" projesini oluşturma tamamlandı.
2>Oluşturma başarılı oldu.
========== Oluşturma: 1 başarılı, 0 başarısız, 0 güncel, 0 atlandı ==========
========== Dağıtım: 0 başarılı, 1 başarısız, 0 atlandı ==========
$header3 = @("Field_1","Field_2","Field_3","Field_4","Field_5")
Import-Csv $fileName -Header $header3 -Delimiter "`t" | select -skip 3 | Foreach-Object {
$record = $indexName
foreach ($property in $_.PSObject.Properties){
#doSomething $property.Name, $property.Value
if($property.Name -like '*CUSIP*'){
$record = $record + "," + '"' + $property.Value + '"'
}
else{
$record = $record + "," + $property.Value
}
}
$array.add($record) | out-null
#write-host $record
}
$('.plus').click(function() {
$('#value').html(function(i, val) { return val*1+1 });
});
$('.minus').click(function() {
$('#value').html(function(i, val) { return val*1-1 });
});