我想在一段时间后自动淡化div onclick和fadeout div(I want to fadein a div onclick and fadeout div after a certain t

其实我的问题是，我想在click事件上fadein div ，并在一段时间后自动fadeout该div 。

我做了一些事情，但fadeout功能不起作用。 这是我的片段：

.alert-box {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  display: none;
  padding: 20px 0;
  background-color: red;
  color: #fff;
}

.close {
  position: absolute;
  right: 10px;
  top: 10px;
  cursor: pointer;
} 
  
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>


<button>click me</button>


<div class="alert-box">
  <span class="close">&times;</span>
  <div class="content">
    sample content
  </div>
</div>


<script type="text/javascript">
  $(document).ready(function() {
    $('button').click(function() {
      $('.alert-box').fadeIn('fast');
    });
    if ($('.alert-box').css('display') == 'block') {
      $('.alert-box').delay(1000).fadeOut('fast');
    }
  });
</script> 
  
 
Actually my problem is, I want to fadein a div on click event, and fadeout that div after a certain time automatically.
 
I have made some thing, but the fadeout function is not working. Here is my snippet:
 
 
 
  
  
.alert-box {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  display: none;
  padding: 20px 0;
  background-color: red;
  color: #fff;
}

.close {
  position: absolute;
  right: 10px;
  top: 10px;
  cursor: pointer;
} 
  
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>


<button>click me</button>


<div class="alert-box">
  <span class="close">&times;</span>
  <div class="content">
    sample content
  </div>
</div>


<script type="text/javascript">
  $(document).ready(function() {
    $('button').click(function() {
      $('.alert-box').fadeIn('fast');
    });
    if ($('.alert-box').css('display') == 'block') {
      $('.alert-box').delay(1000).fadeOut('fast');
    }
  });
</script> 
  
 

                
最满意答案
                
                    
                        
 1秒后使用setTimeout进行淡出 
 
setTimeout (() => {
    $('.alert-box').fadeOut('fast');
}, 1000)
 
 删除了不必要的代码。 
 
 
 
  
  
.alert-box {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  display: none;
  padding: 20px 0;
  background-color: red;
  color: #fff;
}

.close {
  position: absolute;
  right: 10px;
  top: 10px;
  cursor: pointer;
} 
  
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button>click me</button>


<div class="alert-box">
  <span class="close">&times;</span>
  <div class="content">
    sample content
  </div>
</div>


<script type="text/javascript">
  $(document).ready(function() {
    $('button').click(function() {
      $('.alert-box').fadeIn('fast');
      setTimeout(() => {
        if ($('.alert-box').css('display') == 'block') {
          $('.alert-box').delay(1000).fadeOut('fast');
        }
      }, 1000);
    });

  });
</script> 
  
 
Use setTimeout for fadeout after 1 second
 
setTimeout (() => {
    $('.alert-box').fadeOut('fast');
}, 1000)
 
Removed the unnecesary code too.
 
 
 
  
  
.alert-box {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  display: none;
  padding: 20px 0;
  background-color: red;
  color: #fff;
}

.close {
  position: absolute;
  right: 10px;
  top: 10px;
  cursor: pointer;
} 
  
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button>click me</button>


<div class="alert-box">
  <span class="close">&times;</span>
  <div class="content">
    sample content
  </div>
</div>


<script type="text/javascript">
  $(document).ready(function() {
    $('button').click(function() {
      $('.alert-box').fadeIn('fast');
      setTimeout(() => {
        if ($('.alert-box').css('display') == 'block') {
          $('.alert-box').delay(1000).fadeOut('fast');
        }
      }, 1000);
    });

  });
</script>