这个问题与其他问题不同，我问的是如何为HTML添加高分系统，但是在javascript编辑器中。我搜索过YT，日常运动，到处都是，甚至是类似的问题。不过，我想使用本地存储。我没有添加任何猜测来保存高分，所以这只是我没有它的常规代码。
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
canvas {
border:7px solid #00aaff;
background-color: #00aaff;
}
</style>
</head>
<body onload="startGame()">
<br>
<button onmousedown="accelerate(-0.2)"onmouseup="accelerate(0.05)"<p style="height:27px;width:815px">Click to Accelerate</button>
<div class="resetButton"></div>
<button <p style="height:27px;width:815px"<type="button"onclick="alert('Owner: Landon Sturtevant')">Credits</button>
<button <p style="height:27px;width:815px"<type="button"onclick="alert('Click OK to Continue')">Pause</button>
<button <p style="height:27px;width:815px"<type="button"onclick="alert('High Score is ' + highScore());">HighScore</button>
<script>
function highScore(score) {
var saved = 0;
try { saved = parseFloat(localStorage.highScore); } catch (e) { saved = 0; }
if (!(typeof score === 'undefined')) {
saved = score;
localStorage.highScore = '' + score;
}
if (isNaN(saved)) {
saved = 0;
localStorage.highScore = '0';
}
return saved;
}
var myGamePiece;
var myBackground;
var myObstacles = [];
var myScore;
var gameSpeed = 1;
function startGame() {
myBackground = new component(800, 380,"http://static.giantbomb.com/uploads/original/29/297846/2789895-cool+space+backgrounds+desktop+hd+wallpaper.jpg", 0, 0, "image");
myGamePiece = new component(50, 50, "http://images.tourismholdings.com/public/2016/02/56bd3c714ecc6.png", 35, 200, "image");
myScore = new component("30px", "Algerian", "turquoise", 15, 30, "text");
myGameArea.start();
}
var myGameArea = {
canvas : document.createElement("canvas"),
start : function() {
this.canvas.width = 800;
this.canvas.height = 290;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.frameNo = 0;
this.interval = setInterval(updateGameArea, 20);
},
clear : function() {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
},
stop : function() {
clearInterval(this.interval);
}
}
function component(width, height, color, x, y, type) {
if (type == "image") {
this.image = new Image();
this.image.src = color;
}
this.type = type;
this.width = width;
this.height = height;
this.speedX = 0;
this.speedY = 0;
this.gravity = 0.05;
this.gravitySpeed = 0;
this.x = x;
this.y = y;
this.update = function() {
ctx = myGameArea.context;
if (type == "image") {
ctx.drawImage(this.image,
this.x,
this.y,
this.width, this.height);
}
else if (this.type == "text") {
ctx.font = this.width + " " + this.height;
ctx.fillStyle = color;
ctx.fillText(this.text, this.x, this.y);
}
}
this.newPos = function() {
this.gravitySpeed += this.gravity;
this.x += this.speedX;
this.y += this.speedY + this.gravitySpeed;
this.hitBottom();
}
this.hitBottom = function() {
var rockbottom = myGameArea.canvas.height - this.height;
if (this.y > rockbottom) {
this.y = rockbottom;
}
}
this.crashWith = function(otherobj) {
var myleft = this.x;
var myright = this.x + (this.width);
var mytop = this.y;
var mybottom = this.y + (this.height);
var otherleft = otherobj.x;
var otherright = otherobj.x + (otherobj.width);
var othertop = otherobj.y;
var otherbottom = otherobj.y + (otherobj.height);
var crash = true;
if ((mybottom < othertop) || (mytop > otherbottom) || (myright < otherleft) || (myleft > otherright)) {
crash = false;
}
return crash;
}
}
function updateGameArea() {
var x, height, gap, minHeight, maxHeight, minGap, maxGap;
for (i = 0; i < myObstacles.length; i += 1) {
if (myGamePiece.crashWith(myObstacles[i])) {
myGameArea.stop()
document.getElementsByClassName("resetButton")[0].innerHTML='<button onclick="location.reload();"<p style="height:27px;width:815px">Restart Game</button>';
return;
}
}
myGameArea.clear();
myGameArea.frameNo += 1;
if (myGameArea.frameNo == 1 || everyinterval(150)) {
x = myGameArea.canvas.width;
minHeight = 20;
maxHeight = 200;
height = Math.floor(Math.random()*(maxHeight-minHeight+1)+minHeight);
minGap = 150;
maxGap = 250;
gap = Math.floor(Math.random()*(maxGap-minGap+1)+minGap);
myObstacles.push(new component(15, height, "https://orig00.deviantart.net/bb11/f/2014/127/f/e/hexagon_wallpaper___version_3_by_designedby_jack-d7hh9xo.png", x, 0, "image"));
myObstacles.push(new component(15, height, "https://orig00.deviantart.net/bb11/f/2014/127/f/e/hexagon_wallpaper___version_3_by_designedby_jack-d7hh9xo.png", x, height + gap, "image"));
gameSpeed = gameSpeed - 1;
}
myBackground.newPos();
myBackground.update();
for (i = 0; i < myObstacles.length; i += 1) {
myObstacles[i].x += gameSpeed;
myObstacles[i].update();
}
myScore.text="Space Run SCORE: " + myGameArea.frameNo;
myScore.update();
myGamePiece.newPos();
myGamePiece.update();
}
function everyinterval(n) {
if ((myGameArea.frameNo / n) % 1 == 0) {return true;}
return false;
}
function moveup() {
myGamePiece.speedY = -1;
}
function movedown() {
myGamePiece.speedY = 1;
}
function moveleft() {
myGamePiece.speedX = -1;
}
function moveright() {
myGamePiece.speedX = 1;
}
function clearmove() {
myGamePiece.speedX = 0;
myGamePiece.speedY = 0;
}
function accelerate(n) {
myGamePiece.gravity = n;
}
</script>
</body>
</html>
<audio <embed loop="true" autoplay="autoplay">
<source src="http://a.tumblr.com/tumblr_m545gt2gbp1r5da8vo1.mp3" />
</audio>
<script>
</script>
</body>
</html>
答案 0 :(得分：1)
使用localStorage很简单。见https://www.w3schools.com/html/html5_webstorage.asp
function highScore(score) {
var saved = 0;
try { saved = parseFloat(localStorage.highScore); } catch (e) { saved = 0; }
if (!(typeof score === 'undefined')) {
try { score = parseFloat(score); } catch (e) { score = 0; }
if (score>saved) {
saved = score;
localStorage.highScore = '' + score;
}
}
if (isNaN(saved)) {
saved = 0;
localStorage.highScore = '0';
}
return saved;
}