HTML+CSS+JS模仿win10亮度调节效果的示例代码

时间：2021-05-08

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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