js切换背景颜色

我将全部的代码上传到了github,你可以下载查看

	<!-------change the background color-------------->
	<script>
		function color1(event)
  {
  var cubebody=document.getElementById('body_color'); 
        cubebody.className = 'graydient1'; 
  }
		function color2()
  {
      var cubebody=document.getElementById('body_color'); 
       cubebody.className = 'graydient2'; 
  }
		function color3()
  {
      var cubebody=document.getElementById('body_color'); 
       cubebody.className = 'graydient3';  
  }
		function color4()
  {
      var cubebody=document.getElementById('body_color'); 
       cubebody.className = 'graydient4'; 
  }
	</script>
	<style>
/* 下拉按钮样式 */
.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}
 
/* 容器 <div> - 需要定位下拉内容 */
.dropdown {
    position: fixed;
	left: 50px;
	top: 20px;
    display: inline-block;
}
 
/* 下拉内容 (默认隐藏) */
.dropdown-content {
    display: none;
    position: absolute;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
 
/* 下拉菜单的button */
.dropdown-content button {
    background-color: #4CAF50;
	border-radius: 6px;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}
 
/* 鼠标移上去后修改下拉菜单链接颜色 */
.dropdown-content a:hover {background-color: #f1f1f1}
 
/* 在鼠标移上去后显示下拉菜单 */
.dropdown:hover .dropdown-content {
    display: block;
}
 
/* 当下拉内容显示后修改下拉按钮的背景颜色 */
.dropdown:hover .dropbtn {
    background-color: #3e8e41;
}
</style>
 
<div class="dropdown">
  <button class="dropbtn">Background</button>
  <div class="dropdown-content">
	  <button onMouseDown="color1(event)">type 1</button>
	  <button onMouseDown="color2()">type 2</button>
	  <button onMouseDown="color3()">type 3</button>
	  <button onMouseDown="color4()">type 4</button>
  </div>
</div>
	<!--------change color end---------->

　　

第二部分:css

@charset "utf-8";
/* change the color of background */
.graydient1{
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#fce6bc+0,f8a500+42,f8a500+51,f8a500+61,fbd893+100 */
background: #fce6bc; /* Old browsers */
background: -moz-linear-gradient(top, #fce6bc 0%, #f8a500 42%, #f8a500 51%, #f8a500 61%, #fbd893 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, #fce6bc 0%,#f8a500 42%,#f8a500 51%,#f8a500 61%,#fbd893 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, #fce6bc 0%,#f8a500 42%,#f8a500 51%,#f8a500 61%,#fbd893 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#fce6bc', endColorstr='#fbd893',GradientType=0 ); /* IE6-9 */
}
.graydient2{
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#8e8e8e+0,8e8e8e+28,0c0c0c+45,010101+50,0a0a0a+59,4a4a4a+76,353535+87,1a1a1a+100 */
background: #8e8e8e; /* Old browsers */
background: -moz-linear-gradient(top, #8e8e8e 0%, #8e8e8e 28%, #0c0c0c 45%, #010101 50%, #0a0a0a 59%, #4a4a4a 76%, #353535 87%, #1a1a1a 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, #8e8e8e 0%,#8e8e8e 28%,#0c0c0c 45%,#010101 50%,#0a0a0a 59%,#4a4a4a 76%,#353535 87%,#1a1a1a 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, #8e8e8e 0%,#8e8e8e 28%,#0c0c0c 45%,#010101 50%,#0a0a0a 59%,#4a4a4a 76%,#353535 87%,#1a1a1a 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#8e8e8e', endColorstr='#1a1a1a',GradientType=0 ); /* IE6-9 */
}
.graydient3{
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#cfe0e9+0,aacede+17,61acc7+35,3a9cc2+52,42b6d6+59,4cd8f0+71,3aa5c2+84,26688c+100 */
background: #cfe0e9; /* Old browsers */
background: -moz-linear-gradient(top, #cfe0e9 0%, #aacede 17%, #61acc7 35%, #3a9cc2 52%, #42b6d6 59%, #4cd8f0 71%, #3aa5c2 84%, #26688c 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, #cfe0e9 0%,#aacede 17%,#61acc7 35%,#3a9cc2 52%,#42b6d6 59%,#4cd8f0 71%,#3aa5c2 84%,#26688c 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, #cfe0e9 0%,#aacede 17%,#61acc7 35%,#3a9cc2 52%,#42b6d6 59%,#4cd8f0 71%,#3aa5c2 84%,#26688c 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#cfe0e9', endColorstr='#26688c',GradientType=0 ); /* IE6-9 */
}
.graydient4{
/* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#ebeded+1,ebeded+12,d2d3da+28,afb1bf+49,d3d6db+77,ebeded+100 */
background: #ebeded; /* Old browsers */
background: -moz-linear-gradient(top, #ebeded 1%, #ebeded 12%, #d2d3da 28%, #afb1bf 49%, #d3d6db 77%, #ebeded 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, #ebeded 1%,#ebeded 12%,#d2d3da 28%,#afb1bf 49%,#d3d6db 77%,#ebeded 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, #ebeded 1%,#ebeded 12%,#d2d3da 28%,#afb1bf 49%,#d3d6db 77%,#ebeded 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ebeded', endColorstr='#ebeded',GradientType=0 ); /* IE6-9 */
}