jQuery暗模式切换只有一半工作



为作业创建暗模式切换,但它仅适用于 50%

创建了 2 个类,这些类应该更改正文的背景 + 文本颜色。

打开暗模式工作正常,将其切换为返回浅色模式似乎不起作用。由于某种原因似乎无法删除"深色"类并更改为"浅色"类

$('.switch').click(function() { 
        if ($('body').not('dark')) {
            $('body').addClass('dark');
        } 
        else if ($('body').hasClass('dark')) {
            $('body').removeClass('dark');
            $('body').addClass('light');
        }
});
.dark {
    background-color: #000000;
    transition: .5s all ease;
    color: #ffffff;
}
.light {
    background-color: #ffffff;
    transition: .5s all ease;
    color: #000000;
}
/* ----------------------------- SLIDER -----------------------------*/
.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
/*  float: right;*/
}
.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: .4s;
  transition: .4s;
}
.slider::before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}
input:checked + .slider {
  background-color: #696969;
}
/*
input:focus + .slider {
  box-shadow: 0 0 1px #696969;
}
*/
input:checked + .slider::before {
  -webkit-transform: translateX(26px);
  -ms-transform: translateX(26px);
  transform: translateX(26px);
}
/* Rounded sliders */
.slider.round {
  border-radius: 34px;
}
.slider.round::before {
  border-radius: 50%;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<p> Switch theme </p> 
<label class="switch">
   <input type="checkbox">
   <span class="slider round"></span>
</label>

您可以随时简化代码并使light样式成为body的默认值,然后只需打开dark CHANGE而不是CLICK

在开关上使用click时,您实际上触发了两次更改功能。但是,处理它的正确方法就像一个复选框,它是并使用 change .

此外,not('dark')不起作用,因为dark不是选择器,因此if语句将永远不起作用。

$(document).on("change",".switch",function() { 
   $("body").toggleClass("dark");
});
body {
    background-color: #ffffff;
    transition: .5s all ease;
    color: #000000;
}
body.dark {
    background-color: #000000;
    transition: .5s all ease;
    color: #ffffff;
}

/* ----------------------------- SLIDER -----------------------------*/
.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
/*  float: right;*/
}
.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}
.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: .4s;
  transition: .4s;
}
.slider::before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}
input:checked + .slider {
  background-color: #696969;
}
/*
input:focus + .slider {
  box-shadow: 0 0 1px #696969;
}
*/
input:checked + .slider::before {
  -webkit-transform: translateX(26px);
  -ms-transform: translateX(26px);
  transform: translateX(26px);
}
/* Rounded sliders */
.slider.round {
  border-radius: 34px;
}
.slider.round::before {
  border-radius: 50%;
}
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
</head>
<body>
<p> Switch theme </p> 
<label class="switch">
   <input type="checkbox">
   <span class="slider round"></span>
</label>
</body>
</html>

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