我对代码进行了一些修改。
由于您正在使用绝对定位来定位div,因此您需要以不同的方式检查位置。
首先,我使用getBoundingClientRect()
返回元素的位置(左、上、右和下)。
然后我获取鼠标坐标,并计算最接近的边缘是哪个。
您可以在此处查看我的代码示例:
document.querySelector('#content').onmouseleave = function(mouse) {
var edge = closestEdge(mouse, this);
console.log(edge);
}
function closestEdge(mouse, elem) {
var elemBounding = elem.getBoundingClientRect();
var elementLeftEdge = elemBounding.left;
var elementTopEdge = elemBounding.top;
var elementRightEdge = elemBounding.right;
var elementBottomEdge = elemBounding.bottom;
var mouseX = mouse.pageX;
var mouseY = mouse.pageY;
var topEdgeDist = Math.abs(elementTopEdge - mouseY);
var bottomEdgeDist = Math.abs(elementBottomEdge - mouseY);
var leftEdgeDist = Math.abs(elementLeftEdge - mouseX);
var rightEdgeDist = Math.abs(elementRightEdge - mouseX);
var min = Math.min(topEdgeDist,bottomEdgeDist,leftEdgeDist,rightEdgeDist);
switch (min) {
case leftEdgeDist:
return "left";
case rightEdgeDist:
return "right";
case topEdgeDist:
return "top";
case bottomEdgeDist:
return "bottom";
}
}
#content {
width: 100px;
height: 100px;
background: lightblue;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
<div id="content"></div>
希望这对你有所帮助。
祝好!