实现效果图：
当鼠标移动到对应文字位置上时出现提示框，提示框跟随鼠标移动
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>Document</title><style>a{display: block;font-size: 40px;margin: 100px;width: 130px}#msg{width: 600px;height: 150px;background-color: gray;color: white;display: none;position: absolute;}</style><script>/*事件类型：mouseover 让提示框显示mouseout 让提示框隐藏mousemove 让提示框跟随鼠标移动clientXclientY 原点位置：可视窗口的左上角为原点*/var arr = ["HTML。。。", "CSS。。。", "JavaScript。。。", "Angular。。。"]window.onload = function(){var aAs = document.getElementsByTagName("a");var oMsg = document.getElementById("msg");for(var i = 0; i < aAs.length; i++){aAs[i].index = i;aAs[i].onmouseover = function(){oMsg.innerHTML = arr[this.index]oMsg.style.display = 'block';}aAs[i].onmouseout= function(){oMsg.style.display = 'none';}//添加鼠标移动事件aAs[i].onmousemove = function(ev){var e = ev || window.event;oMsg.style.left = e.clientX + 10 + 'px';oMsg.style.top = e.clientY + 10 + 'px';}}} </script></head><body><a href="#">HTML</a><a href="#">CSS</a><a href="#">JavaScript</a><a href="#">Angular</a><div id = 'msg'></div></body></html>
