前言：
此时看官们对“smartclientajax”都比较注意，同学们都想要学习一些“smartclientajax”的相关资讯。那么小编也在网络上网罗了一些关于“smartclientajax””的相关文章，希望我们能喜欢，各位老铁们快快来了解一下吧！前言
JavaScript是最好的语言之一，尤其是在前端开发中。在本文中，您将找到7个为初学者提供免费源代码的最佳javascript项目。
手把手教你7个有趣的JavaScript 项目-上「附源码」（本篇）
手把手教你7个有趣的JavaScript 项目-下「附源码」
1.使用JavaScript创建待办事项列表应用
如果您是javascript语言的初学者，则待办事项列表应用程序是最好的和最容易的应用程序之一，如果您使用HTML CSS和一点点的javascript，则可以创建此简单的待办事项列表应用程序，您将找到源代码这个js项目的底部。
<!DOCTYPE html><html lang="zh"><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" /><title>创建待办事项列表应用</title><style type="text/css">$primary: #313e50;$grey: #cdcdcd;$secondary: #1dd2af;%reset { margin: 0; padding: 0; border: none; outline: none; background: transparent;}%transition { transition: all 0.2s ease; -webkit-transition: all 0.2s ease;}body { background: #f1f1f1; margin-top: 2rem;}/*PEN STYLES*/.tasker { max-width: 400px; margin: 0 auto; .error { display: none; background: rgba(237, 28, 36, 0.7); color: #fff; padding: 14px; margin-bottom: 10px; border-radius: 5px; text-align: center; } ul { @extend %reset; background: #fff; } li, .error, button, input { @extend %reset; font: 18px/1.25em Helvetica, Arial, Sans-serif; }}.tasker-header { display: inline-flex; background: $primary; justify-content: space-between; width: 100%; input, button { color: #fff; box-sizing: border-box; font-size: 1.25em; padding: 14px; } input { flex-grow: 2; } button { @extend %transition; background: $secondary; border-left: 1px solid ($secondary * 1.05); &:hover { background: $secondary * 1.1; } }}.tasker-body { .task { display: block; position: relative; padding: 14px 40px 14px 14px; border-bottom: 1px solid rgba(0, 0, 0, 0.1); &:last-child { border-bottom: none; } &:hover > button { opacity: 1; } &.completed { color: $grey; text-decoration: line-through; } input { margin-right: 10px; } button { @extend %transition; color: $grey; margin: 14px; position: absolute; top: 0; right: 0; opacity: 0; &:hover { color: #ed1c24; } } }}</style></head><body><!--PEN CODE--><div id="tasker" class="tasker"> <div id="error" class="error">Please enter a task</div> <div id="tasker-header" class="tasker-header"> <input type="text" id="input-task" placeholder="Enter a task"> <button id="add-task-btn"><i class="fa fa-fw fa-plus"></i> </button> </div> <div class="tasker-body"> <ul id="tasks"></ul> </div></div><!--END PEN CODE--><script type="text/javascript">(function() { 'use strict'; var tasker = { init: function() { this.cacheDom(); this.bindEvents(); this.evalTasklist(); }, cacheDom: function() { this.taskInput = document.getElementById("input-task"); this.addBtn = document.getElementById("add-task-btn"); this.tasklist = document.getElementById("tasks"); this.tasklistChildren = this.tasklist.children; this.errorMessage = document.getElementById("error"); }, bindEvents: function() { this.addBtn.onclick = this.addTask.bind(this); this.taskInput.onkeypress = this.enterKey.bind(this); }, evalTasklist: function() { var i, chkBox, delBtn; //BIND CLICK EVENTS TO ELEMENTS for (i = 0; i < this.tasklistChildren.length; i += 1) { //ADD CLICK EVENT TO CHECKBOXES chkBox = this.tasklistChildren[i].getElementsByTagName("input")[0]; chkBox.onclick = this.completeTask.bind(this, this.tasklistChildren[i], chkBox); //ADD CLICK EVENT TO DELETE BUTTON delBtn = this.tasklistChildren[i].getElementsByTagName("button")[0]; delBtn.onclick = this.delTask.bind(this, i); } }, render: function() { var taskLi, taskChkbx, taskVal, taskBtn, taskTrsh; //BUILD HTML taskLi = document.createElement("li"); taskLi.setAttribute("class", "task"); //CHECKBOX taskChkbx = document.createElement("input"); taskChkbx.setAttribute("type", "checkbox"); //USER TASK taskVal = document.createTextNode(this.taskInput.value); //DELETE BUTTON taskBtn = document.createElement("button"); //TRASH ICON taskTrsh = document.createElement("i"); taskTrsh.setAttribute("class", "fa fa-trash"); //INSTERT TRASH CAN INTO BUTTON taskBtn.appendChild(taskTrsh); //APPEND ELEMENTS TO TASKLI taskLi.appendChild(taskChkbx); taskLi.appendChild(taskVal); taskLi.appendChild(taskBtn); //ADD TASK TO TASK LIST this.tasklist.appendChild(taskLi); }, completeTask: function(i, chkBox) { if (chkBox.checked) { i.className = "task completed"; } else { this.incompleteTask(i); } }, incompleteTask: function(i) { i.className = "task"; }, enterKey: function(event) { if (event.keyCode === 13 || event.which === 13) { this.addTask(); } }, addTask: function() { var value = this.taskInput.value; this.errorMessage.style.display = "none"; if (value === "") { this.error(); } else { this.render(); this.taskInput.value = ""; this.evalTasklist(); } }, delTask: function(i) { this.tasklist.children[i].remove(); this.evalTasklist(); }, error: function() { this.errorMessage.style.display = "block"; } }; tasker.init();}());</script></body></html>2.使用JavaScript和CSS创建垂直时间轴（里程碑）您可以使用javascript初学者创建的第二个小项目是时间轴，许多现代网站都使用该时间轴使网站更具交互性和动态性。
<!DOCTYPE html><html lang="zh"><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" /><title>CSS创建垂直时间轴（里程碑）</title><style type="text/css">*,*::before,*::after { margin: 0; padding: 0; box-sizing: border-box;}body { font: normal 16px/1.5 "Helvetica Neue", sans-serif; background: #456990; color: #fff; overflow-x: hidden; padding-bottom: 50px;} /* INTRO SECTION–––––––––––––––––––––––––––––––––––––––––––––––––– */.intro { background: #F45B69; padding: 100px 0;}.container { width: 90%; max-width: 1200px; margin: 0 auto; text-align: center;}h1 { font-size: 2.5rem;}/* TIMELINE–––––––––––––––––––––––––––––––––––––––––––––––––– */.timeline ul { background: #456990; padding: 50px 0;}.timeline ul li { list-style-type: none; position: relative; width: 6px; margin: 0 auto; padding-top: 50px; background: #fff;}.timeline ul li::after { content: ''; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%); width: 30px; height: 30px; border-radius: 50%; background: inherit;}.timeline ul li div { position: relative; bottom: 0; width: 400px; padding: 15px; background: #F45B69;}.timeline ul li div::before { content: ''; position: absolute; bottom: 7px; width: 0; height: 0; border-style: solid;}.timeline ul li:nth-child(odd) div { left: 45px;}.timeline ul li:nth-child(odd) div::before { left: -15px; border-width: 8px 16px 8px 0; border-color: transparent #F45B69 transparent transparent;}.timeline ul li:nth-child(even) div { left: -439px;}.timeline ul li:nth-child(even) div::before { right: -15px; border-width: 8px 0 8px 16px; border-color: transparent transparent transparent #F45B69;}time { display: block; font-size: 1.2rem; font-weight: bold; margin-bottom: 8px;}/* EFFECTS–––––––––––––––––––––––––––––––––––––––––––––––––– */.timeline ul li::after { transition: background .5s ease-in-out;}.timeline ul li.in-view::after { background: #F45B69;}.timeline ul li div { visibility: hidden; opacity: 0; transition: all .5s ease-in-out;}.timeline ul li:nth-child(odd) div { transform: translate3d(200px, 0, 0);}.timeline ul li:nth-child(even) div { transform: translate3d(-200px, 0, 0);}.timeline ul li.in-view div { transform: none; visibility: visible; opacity: 1;}/* GENERAL MEDIA QUERIES–––––––––––––––––––––––––––––––––––––––––––––––––– */@media screen and (max-width: 900px) { .timeline ul li div { width: 250px; } .timeline ul li:nth-child(even) div { left: -289px; /*250+45-6*/ }}@media screen and (max-width: 600px) { .timeline ul li { margin-left: 20px; } .timeline ul li div { width: calc(100vw - 91px); } .timeline ul li:nth-child(even) div { left: 45px; } .timeline ul li:nth-child(even) div::before { left: -15px; border-width: 8px 16px 8px 0; border-color: transparent #F45B69 transparent transparent; }}</style></head><body><section class="intro"> <div class="container"> <h1>Vertical Timeline ↓</h1> </div></section><section class="timeline"> <ul> <li> <div> <time>1934</time> demo1 </div> </li> <li> <div> <time>1937</time> demo1 </div> </li> <li> <div> <time>1940</time> demo1 </div> </li> <li> <div> <time>1943</time> demo1 </div> </li> <li> <div> <time>1946</time> demo1 </div> </li> <li> <div> <time>1956</time> demo1 </div> </li> <li> <div> <time>1957</time> demo1 </div> </li> <li> <div> <time>1967</time>demo1 </div> </li> <li> <div> <time>1977</time> demo1 </div> </li> <li> <div> <time>1985</time> demo1 </div> </li> <li> <div> <time>2000</time> demo1 </div> </li> <li> <div> <time>2005</time> demo1 </div> </li> </ul></section><script type="text/javascript">(function() { 'use strict'; // define variables var items = document.querySelectorAll(".timeline li"); // check if an element is in viewport // function isElementInViewport(el) { var rect = el.getBoundingClientRect(); return ( rect.top >= 0 && rect.left >= 0 && rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) && rect.right <= (window.innerWidth || document.documentElement.clientWidth) ); } function callbackFunc() { for (var i = 0; i < items.length; i++) { if (isElementInViewport(items[i])) { items[i].classList.add("in-view"); } } } // listen for events window.addEventListener("load", callbackFunc); window.addEventListener("resize", callbackFunc); window.addEventListener("scroll", callbackFunc);})();</script></body></html>3.用JavaScript构建一个简单的井字游戏如果您想构建简单而有趣的东西来练习JavaScript知识，那么使用HTML CSS和JS创建TIC TAC TOE游戏对您来说是个不错的选择，该游戏虽然简单但并不容易，因此您需要专注于该项目的逻辑方面，因为它是该项目最具挑战性的部分。
<html> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="description" content=""> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>FreeCodeCamp: Tictactoe</title><style type="text/css">@import url();$app-background-color : #508ABB;$app-row-height : 100%;$winAnimStartColor : cyan;$winAnimEndColor : #508ABB;// html, body, div, span, a, li, td, th {// font-family: 'Lato', sans-serif;// font-weight: 300;//// }@-webkit-keyframes winAnim{ 0% { background-color: $winAnimStartColor; } 100% { background-color: $winAnimEndColor; }}@-moz-keyframes winAnim{ 0% { background-color: $winAnimStartColor; } 100% { background-color: $winAnimEndColor; }}@-o-keyframes winAnim { 0% { background-color: $winAnimStartColor; } 100% { background-color: $winAnimEndColor; }}@keyframes winAnim { 0% { background-color: $winAnimStartColor; } 100% { background-color: $winAnimEndColor; }}@keyframes winAnim { 0% { background-color: $winAnimStartColor; } 100% { background-color: $winAnimEndColor; }}*{ -webkit-touch-callout: none; -webkit-user-select: none; -khtml-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; outline-style:none;/*IE*/}.center-box{ margin : auto; position: absolute; top : 0; right : 0; bottom : 0; left : 0;}html,body{ //background-image: linear-gradient(to bottom,#dddbd1,#d2dbdc); background-color: #d2dbdc; height : 100%; width : 100%;}.app{ @extend .center-box; width : 80%; height : 70%; max-width: 550px; background-color : $app-background-color; box-shadow: 0 5px 30px -5px rgba(0,0,0, .85); border-radius: 10px; .app-container, .app-row{ height: $app-row-height; }}.play-box,.symbol-option{ font-family: 'Yesteryear', cursive;}.play-box{ border-bottom : 2px solid #fff; border-right : 2px solid #fff; height : $app-row-height / 3; cursor: pointer; position: relative; &.last-right{ border-right : none; } &.last-bottom{ border-bottom : none; } &.win { -webkit-animation: winAnim .2s ease-out infinite; -moz-animation: winAnim .2s ease-out infinite; -o-animation: winAnim .2s ease-out infinite; animation: winAnim .2s ease-out infinite; animation : winAnim .5s infinite; } .symbol{ @extend .center-box; width: 50%; height : 50px; text-align: center; line-height : 50px; font-size: 35px; color : white; }}.modal-content{ .content{ padding : 15px; text-align: center; margin : 0; &.body{ line-height: 2; } } .symbol-options{ width: 200px; margin-top: 10px; .symbol-option{ &:first-child{ margin-right: 10px; } &:last-child{ margin-left: 10px; } } } .warning-hr{ margin: 0; }}</style> </head> <body> <div class="app"> <div class="container-fluid app-container"> <div class="row app-row"> <div class="col-xs-4 play-box" id="0"> <div class="symbol"></div> </div> <div class="col-xs-4 play-box" id="1"> <div class="symbol"></div> </div> <div class="col-xs-4 play-box last-right" id="2"> <div class="symbol"></div> </div> <div class="col-xs-4 play-box" id="3"> <div class="symbol"></div> </div> <div class="col-xs-4 play-box" id="4"> <div class="symbol"></div> </div> <div class="col-xs-4 play-box last-right" id="5"> <div class="symbol"></div> </div> <div class="col-xs-4 play-box last-bottom" id="6"> <div class="symbol"></div> </div> <div class="col-xs-4 play-box last-bottom" id="7"> <div class="symbol"></div> </div> <div class="col-xs-4 play-box last-right last-bottom" id="8"> <div class="symbol"></div> </div> </div> </div> </div> <div class="modal fade app-modal" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel"> <div class="modal-dialog modal-size"> <div class="modal-content"> <h3 class="content heading">Warning!!!</h3> <hr class="warning-hr"> <div class="content body"> Please save your time and don't even think you're smart. <br><strong><em>I'M SMARTER THAN YOU! HA-HA-HA!!!</em></strong> <br> Wana try me? Chose : <br> <div class="center-block symbol-options"> <button class="symbol-option btn btn-default btn-md" data-dismiss="modal">X</button> OR <button class="symbol-option btn btn-default btn-md" data-dismiss="modal">O</button> </div> </div> </div> </div> </div><script src="../js/bundled/tictactoe.bundled.js"> </script> </body></html>4.创建一个JavaScript倒数计时器开始停止重置许多现代网站和博客都使用倒数计时器来显示倒数，例如，我们通过使用倒数计时器来告诉在线商店的访问者，商品价格将在价格上涨后增加销售量。具体时间。
<!DOCTYPE html><html lang="zh"><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" /><title>CSS创建垂直时间轴（里程碑）</title><style type="text/css"> /* Variabes */ $orange: #ffa600;$grey:#f3f3f3;$white: #fff;$base-color:$orange ;/* Mixin's */ @mixin transition {-webkit-transition: all 0.5s ease-in-out;-moz-transition: all 0.5s ease-in-out;transition: all 0.5s ease-in-out;}@mixin corners ($radius) {-moz-border-radius: $radius;-webkit-border-radius: $radius;border-radius: $radius; -khtml-border-radius: $radius; }body {background:$base-color;font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; height:100%;}.wrapper {width: 800px;margin: 30px auto;color:$white;text-align:center;}h1, h2, h3 { font-family: 'Roboto', sans-serif; font-weight: 100; font-size: 2.6em; text-transform: uppercase;}#seconds, #tens{ font-size:2em;}button{@include corners (5px);background:$base-color;color:$white;border: solid 1px $white;text-decoration:none;cursor:pointer;font-size:1.2em;padding:18px 10px;width:180px;margin: 10px; outline: none; &:hover{ @include transition; background:$white; border: solid 1px $white; color:$base-color; }} </style> </head><body><div class="wrapper"><h1>Stopwatch</h1><h2>Vanilla JavaScript Stopwatch</h2><p><span id="seconds">00</span>:<span id="tens">00</span></p><button id="button-start">Start</button><button id="button-stop">Stop</button><button id="button-reset">Reset</button></div> <script type="text/javascript"> window.onload = function () { var seconds = 00; var tens = 00; var appendTens = document.getElementById("tens") var appendSeconds = document.getElementById("seconds") var buttonStart = document.getElementById('button-start'); var buttonStop = document.getElementById('button-stop'); var buttonReset = document.getElementById('button-reset'); var Interval ; buttonStart.onclick = function() { clearInterval(Interval); Interval = setInterval(startTimer, 10); } buttonStop.onclick = function() { clearInterval(Interval); } buttonReset.onclick = function() { clearInterval(Interval); tens = "00"; seconds = "00"; appendTens.innerHTML = tens; appendSeconds.innerHTML = seconds; } function startTimer () { tens++; if(tens < 9){ appendTens.innerHTML = "0" + tens; } if (tens > 9){ appendTens.innerHTML = tens; } if (tens > 99) { console.log("seconds"); seconds++; appendSeconds.innerHTML = "0" + seconds; tens = 0; appendTens.innerHTML = "0" + 0; } if (seconds > 9){ appendSeconds.innerHTML = seconds; } }<script src="../js/bundled/tictactoe.bundled.js"> </script>} </script> </body></html>5.用JavaScript创建一个简单的乒乓球游戏我可以用JavaScript构建游戏吗？答案是肯定的，使用javascript甚至可以创建复杂的游戏，但是在这种情况下，我们将专注于一个简单的游戏，该游戏可让您练习HTML CSS和javascript技能。
<!DOCTYPE html><html lang="zh"><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" /><title>使用js调用设备摄像头并实现拍照</title><style type="text/css"> body { text-align: center;} </style></head><body> <script type="text/javascript"> // Global Variablesvar DIRECTION = { IDLE: 0, UP: 1, DOWN: 2, LEFT: 3, RIGHT: 4};var rounds = [5, 5, 3, 3, 2];var colors = ['#1abc9c', '#2ecc71', '#3498db', '#e74c3c', '#9b59b6'];// The ball object (The cube that bounces back and forth)var Ball = { new: function (incrementedSpeed) { return { width: 18, height: 18, x: (this.canvas.width / 2) - 9, y: (this.canvas.height / 2) - 9, moveX: DIRECTION.IDLE, moveY: DIRECTION.IDLE, speed: incrementedSpeed || 9 }; }};// The paddle object (The two lines that move up and down)var Paddle = { new: function (side) { return { width: 18, height: 70, x: side === 'left' ? 150 : this.canvas.width - 150, y: (this.canvas.height / 2) - 35, score: 0, move: DIRECTION.IDLE, speed: 10 }; }};var Game = { initialize: function () { this.canvas = document.querySelector('canvas'); this.context = this.canvas.getContext('2d'); this.canvas.width = 1400; this.canvas.height = 1000; this.canvas.style.width = (this.canvas.width / 2) + 'px'; this.canvas.style.height = (this.canvas.height / 2) + 'px'; this.player = Paddle.new.call(this, 'left'); this.paddle = Paddle.new.call(this, 'right'); this.ball = Ball.new.call(this); this.paddle.speed = 8; this.running = this.over = false; this.turn = this.paddle; this.timer = this.round = 0; this.color = '#2c3e50'; Pong.menu(); Pong.listen(); }, endGameMenu: function (text) { // Change the canvas font size and color Pong.context.font = '50px Courier New'; Pong.context.fillStyle = this.color; // Draw the rectangle behind the 'Press any key to begin' text. Pong.context.fillRect( Pong.canvas.width / 2 - 350, Pong.canvas.height / 2 - 48, 700, 100 ); // Change the canvas color; Pong.context.fillStyle = '#ffffff'; // Draw the end game menu text ('Game Over' and 'Winner') Pong.context.fillText(text, Pong.canvas.width / 2, Pong.canvas.height / 2 + 15 ); setTimeout(function () { Pong = Object.assign({}, Game); Pong.initialize(); }, 3000); }, menu: function () { // Draw all the Pong objects in their current state Pong.draw(); // Change the canvas font size and color this.context.font = '50px Courier New'; this.context.fillStyle = this.color; // Draw the rectangle behind the 'Press any key to begin' text. this.context.fillRect( this.canvas.width / 2 - 350, this.canvas.height / 2 - 48, 700, 100 ); // Change the canvas color; this.context.fillStyle = '#ffffff'; // Draw the 'press any key to begin' text this.context.fillText('Press any key to begin', this.canvas.width / 2, this.canvas.height / 2 + 15 ); }, // Update all objects (move the player, paddle, ball, increment the score, etc.) update: function () { if (!this.over) { // If the ball collides with the bound limits - correct the x and y coords. if (this.ball.x <= 0) Pong._resetTurn.call(this, this.paddle, this.player); if (this.ball.x >= this.canvas.width - this.ball.width) Pong._resetTurn.call(this, this.player, this.paddle); if (this.ball.y <= 0) this.ball.moveY = DIRECTION.DOWN; if (this.ball.y >= this.canvas.height - this.ball.height) this.ball.moveY = DIRECTION.UP; // Move player if they player.move value was updated by a keyboard event if (this.player.move === DIRECTION.UP) this.player.y -= this.player.speed; else if (this.player.move === DIRECTION.DOWN) this.player.y += this.player.speed; // On new serve (start of each turn) move the ball to the correct side // and randomize the direction to add some challenge. if (Pong._turnDelayIsOver.call(this) && this.turn) { this.ball.moveX = this.turn === this.player ? DIRECTION.LEFT : DIRECTION.RIGHT; this.ball.moveY = [DIRECTION.UP, DIRECTION.DOWN][Math.round(Math.random())]; this.ball.y = Math.floor(Math.random() * this.canvas.height - 200) + 200; this.turn = null; } // If the player collides with the bound limits, update the x and y coords. if (this.player.y <= 0) this.player.y = 0; else if (this.player.y >= (this.canvas.height - this.player.height)) this.player.y = (this.canvas.height - this.player.height); // Move ball in intended direction based on moveY and moveX values if (this.ball.moveY === DIRECTION.UP) this.ball.y -= (this.ball.speed / 1.5); else if (this.ball.moveY === DIRECTION.DOWN) this.ball.y += (this.ball.speed / 1.5); if (this.ball.moveX === DIRECTION.LEFT) this.ball.x -= this.ball.speed; else if (this.ball.moveX === DIRECTION.RIGHT) this.ball.x += this.ball.speed; // Handle paddle (AI) UP and DOWN movement if (this.paddle.y > this.ball.y - (this.paddle.height / 2)) { if (this.ball.moveX === DIRECTION.RIGHT) this.paddle.y -= this.paddle.speed / 1.5; else this.paddle.y -= this.paddle.speed / 4; } if (this.paddle.y < this.ball.y - (this.paddle.height / 2)) { if (this.ball.moveX === DIRECTION.RIGHT) this.paddle.y += this.paddle.speed / 1.5; else this.paddle.y += this.paddle.speed / 4; } // Handle paddle (AI) wall collision if (this.paddle.y >= this.canvas.height - this.paddle.height) this.paddle.y = this.canvas.height - this.paddle.height; else if (this.paddle.y <= 0) this.paddle.y = 0; // Handle Player-Ball collisions if (this.ball.x - this.ball.width <= this.player.x && this.ball.x >= this.player.x - this.player.width) { if (this.ball.y <= this.player.y + this.player.height && this.ball.y + this.ball.height >= this.player.y) { this.ball.x = (this.player.x + this.ball.width); this.ball.moveX = DIRECTION.RIGHT; beep1.play(); } } // Handle paddle-ball collision if (this.ball.x - this.ball.width <= this.paddle.x && this.ball.x >= this.paddle.x - this.paddle.width) { if (this.ball.y <= this.paddle.y + this.paddle.height && this.ball.y + this.ball.height >= this.paddle.y) { this.ball.x = (this.paddle.x - this.ball.width); this.ball.moveX = DIRECTION.LEFT; beep1.play(); } } } // Handle the end of round transition // Check to see if the player won the round. if (this.player.score === rounds[this.round]) { // Check to see if there are any more rounds/levels left and display the victory screen if // there are not. if (!rounds[this.round + 1]) { this.over = true; setTimeout(function () { Pong.endGameMenu('Winner!'); }, 1000); } else { // If there is another round, reset all the values and increment the round number. this.color = this._generateRoundColor(); this.player.score = this.paddle.score = 0; this.player.speed += 0.5; this.paddle.speed += 1; this.ball.speed += 1; this.round += 1; beep3.play(); } } // Check to see if the paddle/AI has won the round. else if (this.paddle.score === rounds[this.round]) { this.over = true; setTimeout(function () { Pong.endGameMenu('Game Over!'); }, 1000); } }, // Draw the objects to the canvas element draw: function () { // Clear the Canvas this.context.clearRect( 0, 0, this.canvas.width, this.canvas.height ); // Set the fill style to black this.context.fillStyle = this.color; // Draw the background this.context.fillRect( 0, 0, this.canvas.width, this.canvas.height ); // Set the fill style to white (For the paddles and the ball) this.context.fillStyle = '#ffffff'; // Draw the Player this.context.fillRect( this.player.x, this.player.y, this.player.width, this.player.height ); // Draw the Paddle this.context.fillRect( this.paddle.x, this.paddle.y, this.paddle.width, this.paddle.height ); // Draw the Ball if (Pong._turnDelayIsOver.call(this)) { this.context.fillRect( this.ball.x, this.ball.y, this.ball.width, this.ball.height ); } // Draw the net (Line in the middle) this.context.beginPath(); this.context.setLineDash([7, 15]); this.context.moveTo((this.canvas.width / 2), this.canvas.height - 140); this.context.lineTo((this.canvas.width / 2), 140); this.context.lineWidth = 10; this.context.strokeStyle = '#ffffff'; this.context.stroke(); // Set the default canvas font and align it to the center this.context.font = '100px Courier New'; this.context.textAlign = 'center'; // Draw the players score (left) this.context.fillText( this.player.score.toString(), (this.canvas.width / 2) - 300, 200 ); // Draw the paddles score (right) this.context.fillText( this.paddle.score.toString(), (this.canvas.width / 2) + 300, 200 ); // Change the font size for the center score text this.context.font = '30px Courier New'; // Draw the winning score (center) this.context.fillText( 'Round ' + (Pong.round + 1), (this.canvas.width / 2), 35 ); // Change the font size for the center score value this.context.font = '40px Courier'; // Draw the current round number this.context.fillText( rounds[Pong.round] ? rounds[Pong.round] : rounds[Pong.round - 1], (this.canvas.width / 2), 100 ); }, loop: function () { Pong.update(); Pong.draw(); // If the game is not over, draw the next frame. if (!Pong.over) requestAnimationFrame(Pong.loop); }, listen: function () { document.addEventListener('keydown', function (key) { // Handle the 'Press any key to begin' function and start the game. if (Pong.running === false) { Pong.running = true; window.requestAnimationFrame(Pong.loop); } // Handle up arrow and w key events if (key.keyCode === 38 || key.keyCode === 87) Pong.player.move = DIRECTION.UP; // Handle down arrow and s key events if (key.keyCode === 40 || key.keyCode === 83) Pong.player.move = DIRECTION.DOWN; }); // Stop the player from moving when there are no keys being pressed. document.addEventListener('keyup', function (key) { Pong.player.move = DIRECTION.IDLE; }); }, // Reset the ball location, the player turns and set a delay before the next round begins. _resetTurn: function(victor, loser) { this.ball = Ball.new.call(this, this.ball.speed); this.turn = loser; this.timer = (new Date()).getTime(); victor.score++; beep2.play(); }, // Wait for a delay to have passed after each turn. _turnDelayIsOver: function() { return ((new Date()).getTime() - this.timer >= 1000); }, // Select a random color as the background of each level/round. _generateRoundColor: function () { var newColor = colors[Math.floor(Math.random() * colors.length)]; if (newColor === this.color) return Pong._generateRoundColor(); return newColor; }};var Pong = Object.assign({}, Game);Pong.initialize(); </script></body></html>本篇未完结，请继续看下一篇：手把手教你7个有趣的JavaScript 项目-下「附源码」
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