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我尝试使用事件 onclick javascript 更新类主体上的值，它可以工作，但是在刷新页面 index.php 主体类设置为默认值 =“skin-blue”之后

索引.php

<body class="hold-transition skin-blue sidebar-mini">

警告.php

<div class="container col-md-3">

    <div class="panel panel-default">
        <div class="panel-heading">
            <h3 class="panel-tittle"><b>Pengaturan Warna</b></h3>
        </div>

    <div class="panel-body">
            <div class="form-group">
                <input type="radio" name="warna" checked onclick="warna_biru()"> Biru <small>(Default)</small>
            </div>
            <div class="form-group">
                <input type="radio" name="warna" onclick="warna_merah()"> Merah
            </div>
            <div class="form-group">
                <input type="radio" name="warna" onclick="warna_kuning()"> Kuning
            </div>
            <div class="form-group">
                <input type="radio" name="warna" onclick="warna_hijau()"> Hijau
            </div>          
    </div>

</div>

</div>
<!-- js -->
<script type="text/javascript">
function warna_biru() {
  var x = document.getElementsByTagName("body")[0].className ="skin-blue sidebar-mini";
}
function warna_merah() {
  var x = document.getElementsByTagName("body")[0].className ="skin-red sidebar-mini";
}
function warna_kuning() {
  var x = document.getElementsByTagName("body")[0].className ="skin-yellow sidebar-mini";
}
function warna_hijau() {
  var x = document.getElementsByTagName("body")[0].className ="skin-green sidebar-mini";
}
</script>
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