本文实例为大家分享了JS实现简单打字测试的具体代码，供大家参考，具体内容如下
需求：实现以下的功能
1.有三个小方块，分别用来当前输入的错误数量、打字的时间和当前的正确率。
2.下方是用来显示测试句子的容器。
3.最后是输入框
具体思路：
点击输入文本区域时，开始测试，会根据用户输入来统计当前的错误数和正确率，时间会减少。当输完整段句子时，会自动更新下一段句子。当时间为0时，游戏结束，文本框不能再输入，然后会统计打字速度。
具体代码如下：
Html部分
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <link rel="stylesheet" href="./index.css" > <title>打字测试</title> </head> <body> <div class="type_content"> <h3>打字测试</h3> <ul class="type_box"> <li class="error_box"> <p class="error">错误</p> <p class="error_text">0</p> </li> <li class="time_box"> <p style="margin: 10px;">时间</p> <p class="time_text">60s</p> </li> <li class="currcorrect_box"> <p style="margin: 10px;">当前准确率%</p> <p class="currcorrect_text">100</p> </li> <li class="type_speed"> <p style="margin: 10px;">打字速度</p> <p class="type_speed_text">30个/分</p> </li> </ul> <div class="text_box">点击下放文本输入框开始打字！！！</div> <div class="text_area"> <textarea name="" id="textarea_box" placeholder="start typing here..." oninput="processCurrentText()" onfocus="startGame()"> </textarea> </div> <button class="restart" onclick="resetValues()">重新开始</button> </div> <script src="/UploadFiles/2021-04-02/index.js">CSS部分：
*{ margin: 0; padding: 0; } .type_content{ width: 60%; /* height: 440px; */ border: 1px solid #ccccff; max-width: 600px; margin: 50px auto; border-radius: 8px; position: relative; min-width: 500px; } .type_content h3{ text-align: center; margin: 10px 0px; } .type_box{ list-style: none; width: 90%; height: 100px; /* border: 1px solid black; */ margin: 0 auto; margin-bottom: 10px; display: flex; align-items: center; justify-content: space-around; } .type_box li{ width: 88px; height: 88px; /* border: 1px solid black; */ text-align: center; font-size: 16px; border-radius: 8px; /* color: #fff; */ } .error_box{ background-color: #ccffcc; color: red; } .time_box{ background-color: #66ffff; color: #000033; } .currcorrect_box{ background-color: #FFC125; color: #fff; } .type_speed{ background-color: #FF4040; color: #fff; display: none; } .final_correct{ background-color: #E3E3E3; color: #555555; display: none; } .error{ margin: 10px; } .text_box{ width: 80%; /* height: 50px; */ margin: 20px auto 40px auto; /* border: 1px solid black; */ background-color: #D1EEEE; color: #000; border-radius: 6px; /* text-align: center; */ line-height: 40px; padding: 0px 5px; /* box-sizing: border-box; */ } .text_area{ width: 80%; height: 100px; margin: 0px auto; padding-bottom: 50px; margin-bottom: 30px; } #textarea_box{ resize:none; width: 100%; height: 100%; padding: 6px 10px; font-size: 16px; border-radius: 6px; outline: none; border: none; border: 2px solid #eee; } .incorrect_char { color: red; text-decoration: underline; } .correct_char { color: #9B30FF; } .restart{ width: 120px; height: 40px; display: none; border: none; outline: none; cursor: pointer; color: #fff; background-color: #9900ff; border-radius: 6px; position: absolute; bottom: 10px; left: 50%; margin-left: -60px; }JS部分：
//定义测试时间 var testTime = 60; //定义测试的句子 var testSentence = [ "Push yourself, because no one else is going to do it for you.", "Failure is the condiment that gives success its flavor.", // "Wake up with determination. Go to bed with satisfaction.", // "It's going to be hard, but hard does not mean impossible.", // "Learning never exhausts the mind.", // "The only way to do great work is to love what you do." ] //定义dom //1.错误dom var error_text = document.querySelector('.error_text'); //2.时间dom var time_text = document.querySelector('.time_text'); //3.当前正确率 var currcorrect_text = document.querySelector('.currcorrect_text'); //4.打字速度 var type_speed_text = document.querySelector('.type_speed_text'); //打字速度父dom var type_speed = document.querySelector('.type_speed'); //句子dom var text_box = document.querySelector('.text_box'); //输入 var textarea_box = document.querySelector('#textarea_box'); //按钮 var restart = document.querySelector('.restart') var timeLeft = testTime; //当前句子 var currentSentence = ""; //默认开始是索引为0 var startIndex = 0; //错误统计 var errors = 0; var characterTyped = 0; //总错误 var total_errors = 0; var timer = null; var timeElapsed = 0; //已用时间 var accuracy = 0;//正确个数 //更新渲染句子 function updateSentence(){ text_box.textContent = null; currentSentence = testSentence[startIndex]; //句子拆分 var newChar = currentSentence.split(''); for(var i = 0; i < newChar.length; i++){ var charSpan = document.createElement('span'); charSpan.innerText = newChar[i]; text_box.appendChild(charSpan) } if(startIndex < testSentence.length - 1){ startIndex++; }else{ startIndex = 0 } } //输入当前正确的句子 function processCurrentText(){ curr_input = textarea_box.value; curr_input_array = curr_input.split(''); // console.log(curr_input_array); characterTyped++; errors = 0; quoteSpanArray = text_box.querySelectorAll('span'); // console.log(quoteSpanArray); quoteSpanArray.forEach((char,index)=>{ var typeChar = curr_input_array[index]; //当前没有输入 if(typeChar == null){ char.classList.remove('correct_char'); char.classList.remove('incorrect_char'); }else if(typeChar === char.innerText){ //正确的输入 char.classList.add('correct_char'); char.classList.remove('incorrect_char'); }else{ //不正确的输入 char.classList.add('incorrect_char'); char.classList.remove('correct_char'); errors++; } }) error_text.textContent = total_errors + errors; console.log(characterTyped) console.log(error_text.textContent) var correctCharacters = (characterTyped - (total_errors + errors)); var accuracyVal = ((correctCharacters / characterTyped) * 100); console.log(accuracyVal) currcorrect_text.textContent = Math.round(accuracyVal); //输入结束 if(curr_input.length == currentSentence.length){ updateSentence(); total_errors += errors; textarea_box.value = "" } } //开始游戏 function startGame(){ resetValues(); updateSentence(); // clear old and start a new timer clearInterval(timer); timer = setInterval(updateTimer, 1000); } //重新开始 function resetValues(){ timeLeft = testTime; timeElapsed = 0; errors = 0; total_errors = 0; accuracy = 0; characterTyped = 0; startIndex = 0; textarea_box.disabled = false; textarea_box.value = ""; text_box.textContent = 'Click on the area below to start the game.'; currcorrect_text.textContent = 100; time_text.textContent = timeLeft + 's'; type_speed.style.display = 'none'; } //更新时间 function updateTimer() { if (timeLeft > 0) { // decrease the current time left timeLeft--; // increase the time elapsed timeElapsed++; // update the timer text time_text.textContent = timeLeft + "s"; } else { // finish the game finishGame(); } } //游戏结束 function finishGame() { // stop the timer clearInterval(timer); // disable the input area textarea_box.disabled = true; // show finishing text text_box.textContent = "可点击下方按钮重新开始！！！"; // display restart button restart.style.display = "block"; // calculate cpm and wpm console.log(characterTyped,timeElapsed) cpm = Math.round(((characterTyped / timeElapsed) * 60)); // update cpm and wpm text type_speed_text.textContent = cpm + '个/分'; // display the cpm and wpm type_speed.style.display = "block"; }测试效果图：
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