本文实例讲述了js实现键盘控制DIV移动的方法。分享给大家供大家参考。具体分析如下：
css样式部分：
js部分：
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; 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; } };
//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") } };
说明：
上：↑ 下：↓ 左：← 右：→ Ctrl + 1 : 背景变为绿色 Ctrl + 2 : 背景变为黄色 Ctrl + 3 : 背景变为蓝色 Ctrl + ↑ : 放大 Ctrl + ↓ : 缩小
