Posted in Javascript onJanuary 29, 2019
本文实例讲述了JS实现盒子跟着鼠标移动及键盘方向键控制盒子移动。分享给大家供大家参考，具体如下：
1. 盒子跟着鼠标移动
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
*{
margin:0;
padding:0;
}
div{
width: 100px;
height: 100px;
background: red;
position: absolute;
}
</style>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<script>
document.onmousemove=function fn(ev) {
var event=window.event||ev;
var oDiv=document.getElementsByTagName("div");
for(x=0;x<oDiv.length;x++){
oDiv[x].style.transition=(x*0.5)+"s";
oDiv[x].style.left=event.clientX+"px";
oDiv[x].style.top=event.clientY+"px";
}
}
</script>
</body>
</html>
2. 键盘方向键控制盒子移动
<html>
<head>
<meta charset="utf-8" />
<style type="text/css">
div{
width:100px;
height:100px;
background: red;
position:absolute;
left:100px;
top:100px;
transition: 0.1s;
}
</style>
<script>
window.onload = function(){
var oDiv = document.getElementById("div1");
var left = false;
var right = false;
var top = false;
var bottom = false;
document.onkeydown = function(ev){
var oEvent = ev || event;
var keyCode = oEvent.keyCode;
switch(keyCode){
case 37:
left=true;
break;
case 38:
top=true;
break;
case 39:
right=true;
break;
case 40:
bottom=true;
break;
}
};
setInterval(function(){
if(left){
oDiv.style.left = oDiv.offsetLeft-10+"px";
}else if(top){
oDiv.style.top = oDiv.offsetTop-10+"px";
}else if(right){
oDiv.style.left = oDiv.offsetLeft+10+"px";
}else if(bottom){
oDiv.style.top = oDiv.offsetTop+10+"px";
}
},50);
document.onkeyup = function(ev){
var oEvent = ev || event;
var keyCode = oEvent.keyCode;
switch(keyCode){
case 37:
left=false;
break;
case 38:
top=false;
break;
case 39:
right=false;
break;
case 40:
bottom=false;
break;
}
}
}
</script>
</head>
<body>
<div id="div1"></div>
</body>
</html>
感兴趣的朋友可以使用在线HTML/CSS/JavaScript代码运行工具：http://tools.3water.com/code/HtmlJsRun测试一下运行效果。
希望本文所述对大家JavaScript程序设计有所帮助。
JS实现盒子跟着鼠标移动及键盘方向键控制盒子移动效果示例
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s_psycho声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。
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