JavaScript DOM Event对象
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <style type="text/css"> #areaDiv{ width: 300px; height: 100px; border: solid 1px black; } #showMsg{ width: 100px; height: 20px; border: solid 1px black; } #box1{ width: 100px; height: 100px; background-color: red; /* * 要设置偏移量left,top,要开启绝对定位 */ position: absolute; } </style> <body> <div id="areaDiv"></div> <br /> <div id="showMsg"></div> <div id="box1"> </div> </body> <script type="text/javascript"> /*当鼠标移动在areaDiv中,showMsg中显示鼠标坐标 */ var areaDiv=document.getElementById("areaDiv"); var showMsg=document.getElementById("showMsg"); //鼠标移动事件 areaDiv.onmousemove=function(event){ // alert("hello"); //Event事件对象作为实参传入响应函数 var x=event.clientX; var y=event.clientY; showMsg.innerHTML="x="+x+","+"y="+y; } // https://www.w3cschool.cn/jsref/dom-obj-event.html //#box1跟随鼠标移动 var box1=document.getElementById("box1"); document.onmousemove=function(event){ //解决兼容性问题 event=event||window.event; //css设置偏移量,坐标设置 //clientX是相对可见窗口的坐标,有滚动条的时候雨div相对页面的坐标不对应,此时要有pagex box1.style.left=event.pageX+"px"; box1.style.top=event.pageY+"px"; } </script> </html>