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HTML+CSS+JS模仿win10亮度调节效果的示例代码

作者 2020-07-25 1145

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

运行完整代码:

Tips:You can change the code before run.

一、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:

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<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:

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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;
}

二、将各个元素叠到一起

CSS:

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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。

三、添加js

JS:

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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;
        };
    };
};

四、添加一个mask用控制条来控制其透明度达到亮度调节效果

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<div class="mask"></div>
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.mask{
    position:fixed;
    bottom:0;
    top:0;
    left:0;
    right:0;
    background:black;
    z-index:-1;
}
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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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