viewport - 检测鼠标何时离开视口(viewport)顶部？

Question

我想检测鼠标何时离开顶部的视口(viewport)(可以说是向北)。我在网上搜了下How can I detect when the mouse leaves the window? .是一个好的开始，但它也会检测鼠标何时离开其他方向。我怎么能只检测到顶部的导出？

谢谢!

Answer 1

为了在不考虑滚动条和自动完成字段的情况下检测鼠标离开:

document.addEventListener("mouseleave", function(event){

  if(event.clientY <= 0 || event.clientX <= 0 || (event.clientX >= window.innerWidth || event.clientY >= window.innerHeight))
  {

     console.log("I'm out");

  }
});

然后你只需要删除条件:

event.clientY <= 0  is when the mouse leave from the top
event.clientX <= 0  is when the mouse leave from the left
event.clientX >= window.innerWidth is when the mouse leave from the right
event.clientY >= window.innerHeight is when the mouse leave from the bottom