复制代码 代码如下:

<div class=\"cover\"></div>

复制代码 代码如下:

<style>
.cover{
    position:fixed;
    top: 0px;
    left: 0px;
    outline:5000px solid rgba(0, 0, 0, 0.3);
    z-index: 99999;
}
</style>

复制代码 代码如下:

<script>
var brightness;
//显示遮罩
function cover(brightness) {
    if (typeof(div) == \'undefined\') {
        div = document.createElement(\'div\');
        div.setAttribute(\'style\', \'position:fixed;top:0;left:0;outline:5000px solid;z-index:99999;\');
        document.body.appendChild(div);
    } else {
        div.style.display = \'\';
    }
    div.style.outlineColor = \'rgba(0,0,0,\' + brightness + \')\';
}
//事件监听
window.addEventListener(\'keydown\', function(e) {
    if (e.altKey && e.keyCode == 90) { //Alt+Z:打开夜间模式
        cover(brightness = 0.3);
    }
    if (e.altKey && e.keyCode == 88) { //Alt+X:关闭
        cover(brightness = 0);
    }
    if (e.altKey && e.keyCode == 38) { //Alt+↑:增加亮度
        if (brightness - 0.05 > 0.05) cover(brightness -= 0.05);
    }
    if (e.altKey && e.keyCode == 40) { //Alt+↓:降低亮度
        if (brightness + 0.05 < 0.95) cover(brightness += 0.05);
    }
}, false);
</script>