js+html实现打字游戏v1

实现逻辑：设置定时器每秒刷新一次，定时器刷新多少次执行一次生成单词操作来决定单词的生成速度，例如初始单词生成速度为1，那么定时器刷新5次才生成一次单词，每个单词用span来装，每组10个单词放到div里。监听键盘按下事件，用一个变量str记录键盘连续按下的字母组成的字符串，当字符串str包含span中的字符串，则span变红，同时右下角得分数加1，当div中的一排span都变红时，从body里删掉该div。如果有高中必备3500单词作为单词库，每次生成的一组10个单词从中随机选取，效果更加，既能练习打字又能熟悉单词拼写。
上代码：

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><style type="text/css">span{font-size: larger;margin: 20px;}#score{background-color: red;color: white;position: absolute;left:90%;top: 90%;}</style>
</head>
<span id="score">
0
</span><body>
<script>var content = "";var score = 0;//这里可以使用固定单词var words= ["apple","horizontal","vertical","vector","ghost","evil","banana","polo","curve","deploy"];var str = '';var count = 0;//单词生成速度，可以根据当前得分来设置，得分越高速度越快，比如当得分大于200时速度设为2，大于300百是速度设为3var speed = 1;setInterval(()=>{if(count%(6-speed)===0){let divElement = document.createElement('div');for (var i = 0; i <words.length ; i++) {var rand = Math.floor(Math.random()*words.length);var span = document.createElement('span');span.innerText = words[rand];divElement.appendChild(span);document.body.appendChild(divElement);}}count++;},1000)document.addEventListener("keydown",function (event) {str+=event.key;console.log(str);var spans = document.getElementsByTagName('span');var matchCnt = 0;for (var i = 0; i <spans.length ; i++) {if(str.includes(spans[i].innerText)){spans[i].style.color = 'red'score++;matchCnt++;}}if(matchCnt>0){str = '';}document.getElementById('score').innerText = score;//清除全部打出的一行var divs = document.getElementsByTagName('div');for (var i = 0; i <divs.length ; i++) {var children = divs[i].children;var redCnt = 0;for (var j = 0; j <children.length ; j++) {if(children[j].style.color === 'red'){redCnt++;}}if(redCnt===children.length){document.body.removeChild(divs[i]);}}});</script>
</body>
</html>