再次發JS貪吃蛇代碼

再次分享一個自己寫的貪吃蛇游戲代碼，按回車鍵開始游戲。在游戲代碼中，表格行數、初始方向、方塊下落速度、存儲蛇尾方向的數組，數組長度=蛇的長度、分數元素等都可以自己定義，以前有發過幾個貪吃食代碼，本不想發了，不過覺得這個寫的也不錯，多多益善吧。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Js貪吃蛇代碼</title><style type="text/css">*{ margin:0; padding:0;}body{ overflow:hidden;}#contentBox{margin:50px auto 10px; background:#eee; width:421px; height:421px; border-collapse:collapse;}#contentBox tr td{ width:20px; height:20px; border:1px #ccc solid;}.snakeflag{ background:#666;}.eatFood{ background:red;}.controlArea{ width:420px; margin:0px auto;}#controlBtn{ width:70px; height:34px;font-weight:bold; font-size:24px;}.levelArea,.scoreArea{ margin-left:50px;}</style></head><body><table id="contentBox"><tbody></tbody></table><div   id="ywmwoq6"   class="controlArea">	<button id="controlBtn" title="可按回車鍵開始游戲">開始</button>    <span id="6kacsaw"    class="levelArea">    	<strong>Level：</strong>    	<select id="level">        	<option value="1">1</option>            <option value="2">2</option>            <option value="3">3</option>            <option value="4">4</option>            <option value="5">5</option>            <option value="6">6</option>            <option value="7">7</option>            <option value="8">8</option>            <option value="9">9</option>            <option value="10">10</option>        </select>    </span>    <span id="i6w82so"    class="scoreArea">    	<strong>當前分數：</strong>    	<span id="score">0</span>    </SPAN>
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