JS仿贪吃蛇：一串跟着鼠标的Div
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贪吃蛇是一款80后、90后比较熟悉的经典游戏，下面通过简单的JS代码来实现低仿版贪吃蛇效果：随着鼠标的移动，在页面中呈现所有Div块跟随鼠标依次移动，效果如下图所示。
<!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8"> <title>习题-仿select下拉框</title> <style> div width: 20px;height: 20px;background-color: purple;position: absolute; </style> <script> //此处写代码 </script> </head> <body> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> <div></div> </body> </html>
参考代码：
window.onload = function ()
// getPos函数获取鼠标的坐标
function getPos(ev)
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
return x: ev.clientX + scrollTop, y: ev.clientY + scrollLeft ;
document.onmousemove = function (ev)
var oEvent = ev || event;
var pos = getPos(oEvent);
var aDiv = document.getElementsByTagName(‘div‘);
//递减循环
for (var i = aDiv.length - 1; i > 0; i--)
aDiv[i].style.left = aDiv[i - 1].offsetLeft + ‘px‘;
aDiv[i].style.top = aDiv[i - 1].offsetTop + ‘px‘;
aDiv[0].style.left = pos.x + ‘px‘;
aDiv[0].style.top = pos.y + ‘px‘;
思考：为什么采用下面递增循环代码就无法达到预期效果？
代码：
// 与参考文档区别部分
for (var i = 0; i < aDiv.length - 1; i++)
aDiv[i + 1].style.left = aDiv[i].offsetLeft + ‘px‘;
aDiv[i + 1].style.top = aDiv[i].offsetTop + ‘px‘;
效果：
如果递增循环设计进行修改后，可以实现其它独特效果：(平移连珠直线)
代码：
window.onload = function ()
// getPos函数获取鼠标移动时的坐标
function getPos(ev)
var scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
var scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
return x: ev.clientX + scrollTop, y: ev.clientY + scrollLeft ;
document.onmousemove = function (ev)
var oEvent = ev || event;
var pos = getPos(oEvent);
var aDiv = document.getElementsByTagName(‘div‘);
for (var i = 0; i < aDiv.length - 1; i++)
aDiv[i + 1].style.left = aDiv[i].offsetLeft + 20 + ‘px‘;
aDiv[i + 1].style.top = aDiv[i].offsetTop + 20 + ‘px‘;
aDiv[0].style.left = pos.x + ‘px‘;
aDiv[0].style.top = pos.y + ‘px‘;
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