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主要代碼實現(xiàn)：

部分JS代碼 :

var stage = {w: 1280,h: 720 }var _pexcanvas = document.getElementById("canvas"); _pexcanvas.width = stage.w; _pexcanvas.height = stage.h; var ctx = _pexcanvas.getContext("2d");var pointer = {x: stage.w / 2,y: stage.h / 4 }var scale = 1; var portrait = true; var loffset = 0; var toffset = 0; var mxpos = 0; var mypos = 0;// ------------------------------------------------------------------------------- Gamyvar againprog = 0;var healthprog = 0;function newGame() {score = 0;health = 100;enemies = [];enemies.push(new Enemy());enemies.push(new Enemy());enemies.push(new Enemy());againprog = 0; }function drawHeart(x, y, w) {ctx.beginPath();ctx.arc(x - w / 4, y, w / 4, 0.75 * Math.PI, 0);ctx.arc(x + w / 4, y, w / 4, 1 * Math.PI, 2.25 * Math.PI);ctx.lineTo(x, y + w / 1.5);ctx.closePath();ctx.fill(); }var Cannon = function(x, y, tx, ty) {this.x = x;this.y = y;this.tx = tx;this.ty = ty;this.r = 10; }var cannons = [];var gameover = false;cannons.push(new Cannon(stage.w, stage.h, stage.w / 2, stage.h / 2));var firetm = 0; var fireact = true;var health = 100; var score = 0;var arm = {x: stage.w,y: stage.h }; var arm2 = {x: 0,y: stage.h }; var danger = false; var dangera = 0;var Enemy = function() {this.x = stage.w / 2;this.y = stage.h / 2;this.r = 10;this.tx = Math.floor(Math.random() * stage.w);this.ty = Math.floor(Math.random() * stage.h);this.des = false;this.eyeX = 0.4;this.eyeY = 0.25;this.eyeR = 0.25;this.sp = 50;this.spl = 1.4;this.op = 1;this.danger = false;this.nuked = false; }

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