JS实现用键盘控制DIV
来源：程序员人生 发布时间：2015-04-01 08:28:34 阅读次数：3592次
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf⑻" />
<title>用键盘控制DIV</title>
<style type="text/css">
html,body{overflow:hidden;}
body{margin:0;padding:0;}
pre{color:green;padding:10px 15px;background:#f0f0f0;border:1px dotted #333;font:12px/1.5 Courier New;margin:12px;}
span{color:#999;}
#box{position:absolute;top:50px;left:300px;width:100px;height:100px;background:red;}
</style>
<script type="text/javascript">
window.onload = function ()
{
var oBox = document.getElementById("box");
var bLeft = bTop = bRight = bBottom = bCtrlKey = false;
setInterval(function ()
{
if (bLeft)
{
oBox.style.left = oBox.offsetLeft - 10 + "px"
}
else if (bRight)
{
oBox.style.left = oBox.offsetLeft + 10 + "px"
}
if (bTop)
{
oBox.style.top = oBox.offsetTop - 10 + "px"
}
else if(bBottom)
{
oBox.style.top = oBox.offsetTop + 10 + "px"
}
//避免溢出
limit();
},30);
document.onkeydown = function (event)
{
var event = event || window.event;
bCtrlKey = event.ctrlKey;
switch (event.keyCode)
{
case 37:
bLeft = true;
break;
case 38:
if(bCtrlKey)
{
var oldWidth = oBox.offsetWidth;
var oldHeight = oBox.offsetHeight;
oBox.style.width = oBox.offsetWidth * 1.5 + "px";
oBox.style.height = oBox.offsetHeight * 1.5 + "px";
oBox.style.left = oBox.offsetLeft - (oBox.offsetWidth - oldWidth) / 2 + "px";
oBox.style.top = oBox.offsetTop - (oBox.offsetHeight - oldHeight) / 2 + "px";
break;
}
bTop = true;
break;
case 39:
bRight = true;
break;
case 40:
if(bCtrlKey)
{
var oldWidth = oBox.offsetWidth;
var oldHeight = oBox.offsetHeight;
oBox.style.width = oBox.offsetWidth * 0.75 + "px";
oBox.style.height = oBox.offsetHeight * 0.75 + "px";
oBox.style.left = oBox.offsetLeft - (oBox.offsetWidth - oldWidth) / 2 + "px";
oBox.style.top = oBox.offsetTop - (oBox.offsetHeight - oldHeight) / 2 + "px";
break;
}
bBottom = true;
break;
case 49:
bCtrlKey && (oBox.style.background = "green");
break;
case 50:
bCtrlKey && (oBox.style.background = "yellow");
break;
case 51:
bCtrlKey && (oBox.style.background = "blue");
break;
}
return false
};
document.onkeyup = function (event)
{
switch ((event || window.event).keyCode)
{
case 37:
bLeft = false;
break;
case 38:
bTop = false;
break;
case 39:
bRight = false;
break;
case 40:
bBottom = false;
break;
}
};
//避免溢出
function limit()
{
var doc = [document.documentElement.clientWidth, document.documentElement.clientHeight]
//避免左边溢出
oBox.offsetLeft <=0 && (oBox.style.left = 0);
//避免顶部溢出
oBox.offsetTop <=0 && (oBox.style.top = 0);
//避免右边溢出
doc[0] - oBox.offsetLeft - oBox.offsetWidth <= 0 && (oBox.style.left = doc[0] - oBox.offsetWidth + "px");
//避免底部溢出
doc[1] - oBox.offsetTop - oBox.offsetHeight <= 0 && (oBox.style.top = doc[1] - oBox.offsetHeight + "px")
}
};
</script>
</head>
<body>
<pre>
红色方块为键盘操作区域，您可以进行以下操作：
上：↑ 下：↓ 左：← 右：→
Ctrl + 1 : 背景变成绿色
Ctrl + 2 : 背景变成黄色
Ctrl + 3 : 背景变成蓝色
Ctrl + ↑ : 放大
Ctrl + ↓ : 缩小
</pre>
<div id="box"></div>
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</body>
</html>
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