JS判断鼠标从什么方向进入一个容器(转)
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>判断鼠标进入方向</title>
</head>
<body>
<style>
html,body{margin:0;padding:0;}
#wrap{width:300px;height:300px;background:#33aa00;margin:50px;display:inline-block;font-size:50px;text-align:center;line-height:300px;}
</style>
<div id="wrap">
方向反馈
</div>
<script type="text/javascript" src="http://ajax.microsoft.com/ajax/jquery/jquery-1.4.min.js"></script>
<script>
$("#wrap").bind("mouseenter mouseleave",
function(e) {
var w = $(this).width();
var h = $(this).height();
var x = (e.pageX - this.offsetLeft - (w / 2)) * (w > h ? (h / w) : 1);
var y = (e.pageY - this.offsetTop - (h / 2)) * (h > w ? (w / h) : 1);
var direction = Math.round((((Math.atan2(y, x) * (180 / Math.PI)) + 180) / 90) + 3) % 4;
var eventType = e.type;
var dirName = new Array('上方','右侧','下方','左侧');
if(e.type == 'mouseenter'){
$(this).html(dirName[direction]+'进入');
}else{
$(this).html(dirName[direction]+'离开');
}
});
</script>
</body>
</html>
/***********************以上是jquery代码,下面是原生js**********************/
var wrap = document.getElementById('wrap');
var hoverDir = function(e){
var w=wrap.offsetWidth;
var h=wrap.offsetHeight;
var x=(e.clientX - wrap.offsetLeft - (w / 2)) * (w > h ? (h / w) : 1);
var y=(e.clientY - wrap.offsetTop - (h / 2)) * (h > w ? (w / h) : 1);
var direction = Math.round((((Math.atan2(y, x) * (180 / Math.PI)) + 180) / 90) + 3) % 4;
var eventType = e.type;
var dirName = new Array('上方','右侧','下方','左侧');
if(e.type == 'mouseover' || e.type == 'mouseenter'){
wrap.innerHTML=dirName[direction]+'进入';
}else{
wrap.innerHTML=dirName[direction]+'离开';
}
}
if(window.addEventListener){
wrap.addEventListener('mouseover',hoverDir,false);
wrap.addEventListener('mouseout',hoverDir,false);
}else if(window.attachEvent){
wrap.attachEvent('onmouseenter',hoverDir);
wrap.attachEvent('onmouseleave',hoverDir);
}