HTML+CSS+JS模仿win10亮度调节效果的示例代码

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

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;        };    };};

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HTML+CSS+JS模仿win10亮度调节效果的示例代码