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HTML+CSS+JS模仿win10亮度调节效果的示例代码

2020-06-20 11:47 218 查看

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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标签：  HTML css Win10 亮度调节
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