这篇文章主要介绍了HTML+CSS+JS模仿win10亮度调节效果的示例代码,本文通过实例代码给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下
HTML+CSS+JS模仿win10亮度调节效果
代码
<!doctype html>
<html>
 <head>
 <meta charset="utf-8">
 <title>模仿win10的亮度调节</title>
 <style>
 .control_bar{
 height:200px;
 width:500px;
 border-bottom:3px solid #888888;
 
 }
 .control_bar_cursor{
 height:25px;
 width:8px;
 background: #505151;
 border-radius:5px;
 margin-top:-12.5px;
 position:relative;
 top:0;
 left:0;
 }
 .control_bar_cursor:hover{
 background:white;
 }
 #control_bar_mask{
 margin-top:-203px;
 width:0px;
 }
 .mask{
 position:fixed;
 bottom:0;
 top:0;
 left:0;
 right:0;
 background:black;
 z-index:-1;
 }
 </style>
 </head>
 <body>
 <div class="mask"></div>
 <div class="control_bar"></div>
 <div class="control_bar" style="border-bottom:3px solid #505151;" id="control_bar_mask"></div>
 <div class="control_bar_cursor"></div>
 </body>
 <script>
 window.onload = function(){
 var control_bar = document.getElementsByClassName("control_bar")[0];
 var control_bar_mask = document.getElementById("control_bar_mask");
 var control_bar_cursor = document.getElementsByClassName("control_bar_cursor")[0];
 var def_left = control_bar_cursor.offsetLeft;
 var mask = document.getElementsByClassName("mask")[0];
 document.body.onmousedown = function(){
 window.onmousemove = function(){
 var cursor_X = event.clientX;
 var cursor_Y = event.clientY;
 if(cursor_X < def_left){
 control_bar_cursor.style.left = 0;
 }else if(cursor_X > control_bar.offsetWidth + def_left){
 control_bar_cursor.style.left = control_bar.offsetWidth;
 }else{
 control_bar_cursor.style.left = cursor_X - def_left + "px";
 }
 //亮度比
 var proportion = parseInt(control_bar_cursor.offsetLeft - def_left) / parseInt(control_bar.offsetWidth - 1);
 control_bar_mask.style.width = proportion * control_bar.offsetWidth + "px";
 mask.style.opacity = 1 - proportion;
 };
 window.onmouseup = function(){
 window.onmousemove = null;
 };
 };
 };
 </script>
</html>
1.将各个元素的样子写出来
这里为了方便好观察给body添加了一个背景颜色
html
<div class="control_bar">
</div>
<div class="control_bar" style="border-bottom:3px solid #505151;" 
id="control_bar_mask>
</div>
<div class="control_bar_cursor">
</div>
css
body{
 background:back;
}
.control_bar{
 height:200px;
 width:500px;
 border-bottom:3px solid #888888;
}
.control_bar_cursor{
 height:25px;
 width:8px;
 background: #505151;
 border-radius:5px;
}
效果图
2. 将各个元素叠到一起
css
body{
 background:black;
}
.control_bar{
 height:200px;
 width:500px;
 border-bottom:3px solid #888888;
}
.control_bar_cursor{
 height:25px;
 width:8px;
 background: #505151;
 border-radius:5px;
 margin-top:-12.5px;
 position:relative;
 top:0;
 left:0;
}
.control_bar_cursor:hover{
 background:white;
}
#control_bar_mask{
 margin-top:-203px;
 width:100px;
}
这里为了显示遮罩效果把遮罩层的div宽度设小了
3. 添加js
js
window.onload = function(){
 var control_bar = document.getElementsByClassName("control_bar")[0];
 var control_bar_mask = document.getElementById("control_bar_mask");
 var control_bar_cursor = document.getElementsByClassName("control_bar_cursor")[0];
 var def_left = control_bar_cursor.offsetLeft;
 document.body.onmousedown = function(){
 window.onmousemove = function(){
 var cursor_X = event.clientX;
 var cursor_Y = event.clientY;
 if(cursor_X < def_left){
 control_bar_cursor.style.left = 0;
 }else if(cursor_X > control_bar.offsetWidth + def_left){
 control_bar_cursor.style.left = control_bar.offsetWidth;
 }else{
 control_bar_cursor.style.left = cursor_X - def_left + "px";
 }
 var proportion = parseInt(control_bar_cursor.offsetLeft - def_left) / parseInt(control_bar.offsetWidth - 1);
 control_bar_mask.style.width = proportion * control_bar.offsetWidth + "px";
 };
 window.onmouseup = function(){
 window.onmousemove = null;
 };
 };
};
4. 添加一个mask用控制条来控制其透明度达到亮度调节效果
<div class="mask"></div>
.mask{
 position:fixed;
 bottom:0;
 top:0;
 left:0;
 right:0;
 background:black;
 z-index:-1;
}
window.onload = function(){
 var control_bar = document.getElementsByClassName("control_bar")[0];
 var control_bar_mask = document.getElementById("control_bar_mask");
 var control_bar_cursor = document.getElementsByClassName("control_bar_cursor")[0];
 var def_left = control_bar_cursor.offsetLeft;
 var mask = document.getElementsByClassName("mask")[0];
 document.body.onmousedown = function(){
 window.onmousemove = function(){
 var cursor_X = event.clientX;
 var cursor_Y = event.clientY;
 if(cursor_X < def_left){
 control_bar_cursor.style.left = 0;
 }else if(cursor_X > control_bar.offsetWidth + def_left){
 control_bar_cursor.style.left = control_bar.offsetWidth;
 }else{
 control_bar_cursor.style.left = cursor_X - def_left + "px";
 }
 //亮度比
 var proportion = parseInt(control_bar_cursor.offsetLeft - def_left) / parseInt(control_bar.offsetWidth - 1);
 control_bar_mask.style.width = proportion * control_bar.offsetWidth + "px";
 mask.style.opacity = 1 - proportion;
 };
 window.onmouseup = function(){
 window.onmousemove = null;
 };
 };
};
总结
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