最近水猿比较忙，先放段之前写游戏用的js代码，等忙完这段时间，继续与大家分享node学习。
$(function () {
//小键盘事件
var oBox = document.getElementsByClassName("hid")[0];
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"
}
//防止溢出
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;
}
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;
}
};
//防止溢出
function limit()
{
var doc = [document.documentElement.clientWidth, document.documentElement.clientHeight]
//防止左侧溢出
oBox.offsetLeft <=0 && (oBox.style.left = 0);
//防止顶部溢出
oBox.offsetTop <=0 && (oBox.style.top = 0);
//防止右侧溢出
doc[0] - oBox.offsetLeft - oBox.offsetWidth <= 0 && (oBox.style.left = doc[0] - oBox.offsetWidth + "px");
//防止底部溢出
doc[1] - oBox.offsetTop - oBox.offsetHeight <= 0 && (oBox.style.top = doc[1] - oBox.offsetHeight + "px")
}
})