<style>
.cover{
position:fixed;
top: 0px;
left: 0px;
outline:5000px solid rgba(0, 0, 0, 0.3);
z-index: 99999;
}
</style>
<body>
<div class="cover"></div>
<div><p>fsdgsgsgsg5ter </p></div>
</body>
<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>
详情：http://www.codeweblog.com/%E4%BD%BF%E7%94%A8javascript%E4%B8%BA%E7%BD%91%E9%A1%B5%E5%A2%9E%E5%8A%A0%E5%A4%9C%E9%97%B4%E6%A8%A1%E5%BC%8F/
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