<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title></title> <style type="text/css"> * { margin: 0; padding: 0; } </style> </head> <body style="position: relative;"> <div id="box" style="width: 100px;height: 100px;background-color: sandybrown;position: absolute;"> </div> <script type="text/javascript">
/*获取浏览器的最大化尺寸*/ var wi = document.documentElement.clientWidth - 100; //取得浏览器页面可视区域的宽度,（并且需要减去 方块的宽度） var hi = document.documentElement.clientHeight - 100; //取得浏览器页面可视区域的高度，（并且需要减去 方块的高度） var box = document.getElementById("box") document.addEventListener("keydown", function(e) { var l = parseInt(window.getComputedStyle(box, null).left); //获取方块坐标 var t = parseInt(window.getComputedStyle(box, null).top); console.log(l, t) var event = e || window.event if(event.key == "w" & t > 0) { box.style.top = t - 10 + "px"; }; if(event.key == "s" & t < hi) { box.style.top = t + 10 + "px"; }; if(event.key == "a" & l > 0) { box.style.left = l - 10 + "px"; }; if(event.key == "d" & l < wi) { box.style.left = l + 10 + "px"; }; }, false) </script> </body> </html>