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Using HTML5+JS to realize the handheld game racing demo

Source: Internet
Author: User
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Recently bored, with Html5+js did a previously played palm-machine racing game, by the way to learn the canvas API and consolidate the JS Foundation.

Game interface, did not do anything to beautify.

Game rules: The game interface is divided into three columns, black squares randomly falling, red squares can be moved freely in three columns (with the direction key, long press the arrow key Black block to accelerate the decline). Red squares hit black squares to lose.

Score: Every normal through a black square plus 12 points, accelerated by adding 30 points.

Directly below the code:

Html:

1 <!DOCTYPE HTML>2 <HTML>3 <HeadLang= "en">4     <MetaCharSet= "UTF-8">5     <title></title>6 </Head>7 <style>8 Body{9 text-align:Center;Ten     } One #mycar{ A Border:1px solid Black; -     } - </style> the <Body> -     <CanvasID= "Mycar"width= "300px"Height= "500px"></Canvas> -     <DivID= "scored">Rating: 0</Div> -     <Scriptsrc= "Js/mycar.js"></Script> + </Body> - </HTML>

JS:

1 functionCreatecar (speed,cxt,dom) {2     varo =NewObject ();3O.speed =Speed ;4O.CXT =cxt;5O.cell = 100;6O.curdir = {' x ': +, ' y ': 400};7O.hinder = [[],[],[]];8O.scroll = 0;9o.scored = 0;TenO.init =function () { OneO.cxt.fillstyle = ' Red '; A O.cxt.fillrect (o.curdir.x, O.curdir.y, O.cell, O.cell); -Document.onkeydown =function(e) { -             if(E.keycode = = = PNs && o.curdir.x > 0){ theO.movecar (' left '); -             } -             Else if(E.keycode = = = && O.curdir.x < 200){ -O.movecar (' right '); +             } -             Else if(E.keycode = = 40) +O.speed = SPEED/3; A         }; atDocument.onkeyup =function () { -O.speed =Speed ; -         }; - O.sethinder (); - O.downhinder (); -     }; inO.sethinder =function () { -         varRand1 = Math.ceil (Math.random () * 1000)% 2, toRand2 = Math.ceil (Math.random () * 1000)% 2, +Rand3 = Math.ceil (Math.random () * 1000)% 2; -O.hinder[0].push ({' X ': 0, ' y ': 0, ' Hinder ': Rand1}); theO.hinder[1].push ({' x ': +, ' y ': 0, ' Hinder '): Rand2}); *O.hinder[2].push ({' X ': $, ' Y ': 0, ' hinder ': rand1 + rand2 = = 2?0: Rand3}); $          for(vari = 0; i < o.hinder.length; i + +){Panax Notoginseng             varLast =o.hinder[i][o.hinder[i].length-1]; -             if(Last.hinder = = 1) { theO.cxt.fillstyle = ' Black '; + O.cxt.fillrect (Last.x,last.y, O.cell, O.cell); A             } the         } +     }; -O.downhinder =function () { $SetTimeout (function () { $             vari = 0, -j = 0, -Cur =NULL, theOld =NULL; -              for(i = 0; i < o.hinder[0].length; i + +)) {Wuyi                  for(j = 0; J < 3; J + +)) { theCur =O.hinder[j][i]; -                     if(Cur.hinder = = 1) { WuOld =O.hinder[j][i]; - O.cxt.clearrect (Old.x,old.y, O.cell, O.cell); AboutO.HINDER[J][I].Y = o.hinder[j][i].y + 5; $Cur =O.hinder[j][i]; -O.cxt.fillstyle = ' Black '; - O.cxt.fillrect (Cur.x,cur.y, O.cell, O.cell); -                     } A                     Else +O.HINDER[J][I].Y = o.hinder[j][i].y + 5; the                 } -             } $              for(i = 0; i < o.hinder.length; i + +)) { the                 if(O.HINDER[I][0].Y >= 500) { theo.scored = o.scored + Math.ceil (100/o.speed); thedom.innerhtml = ' Score: ' +o.scored; the                     varover =O.hinder[i].shift (); -                     if(Over.hinder = = 1) in O.cxt.clearrect (Over.x,over.y, O.cell, O.cell); the                 } the             } About             if(O.hinder[o.curdir.x/100][0].hinder = = = 1 && o.hinder[o.curdir.x/100][0].y + >=o.curdir.y) { theAlert (' You hang up '); the                 return; the             } +O.scroll = O.scroll + 5; -             if(o.scroll% 300 = = 0) the O.sethinder ();Bayi O.downhinder (); the }, O.speed); the     }; -O.movecar =function(dir) { -O.cxt.fillstyle = ' Red '; the O.cxt.clearrect (o.curdir.x, O.curdir.y, O.cell, O.cell); theO.curdir.x = (dir = = = ' Left '? O.curdir.x-o.cell:o.curdir.x +O.cell); the O.cxt.fillrect (O.curdir.x,o.curdir.y, O.cell, O.cell); the     }; -     returno; the } the  the varc = document.getElementById (' Mycar ');94 varScored = document.getElementById (' scored ')); the varCXT = C.getcontext (' 2d '); the varCar = Createcar (30, cxt,scored); theCar.init ();

Algorithm write a little bad, there is a great God passing by hope to write a guide.

Using HTML5+JS to realize the handheld game racing demo

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