经典js代码游戏红方块躲避：谁能坚持60秒？

2017年07月26日 13:28:43益点益滴2250
一款曾经风靡一时的经典小游戏，很早以前就有国外高人用JS代码给写出来了，现特收集来分享于此。原来创造一款游戏可以如此简单！鼠标控制移动红色方块不要让蓝色方块碰到就可以，看你能玩多久，想用js写游戏的朋友也可以参考下。
如果你能达到18秒以上，你是个天才。
据说，美国空军的飞行员，被强制达到2分钟。
GO！点击运行代码开始游戏！
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> 
<HTML>
<HEAD>
<TITLE>Escapa!红方块躲避游戏-yiwuku.com</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312"> 
<SCRIPT type="text/javascript"> 
isNS4 = (document.layers) ? true : false; 
isIE4 = (document.all && !document.getElementById) ? true : false; 
isIE5 = (document.all && document.getElementById) ? true : false; 
isNS6 = (!document.all && document.getElementById) ? true : false; 
var curX, curY, curX2, curY2, boxX, boxY, moving=0, touch=0; 
var gametime=0, started=0, speed; 
var starttime, endtime, finaltime=0; //pass finaltime to popup window to ask for initials 
var enemyxdir = new Array(1,1,1,1); 
var enemyydir = new Array(1,1,1,1); 
if (isNS4 || isNS6){ 
document.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN|Event.MOUSEMOVE); 
} 
document.onmousedown = start; 
document.onmousemove = checkLocation; 
document.onmouseup = stop; 
function startclock() {var today = new Date(); starttime = today.getTime();} 
function endclock() {var today = new Date(); endtime = today.getTime();} 
function calctime() {var time = (endtime - starttime - 0)/1000;    return time;} 
function giveposX(divname) { 
    if (isNS4) var posLeft = document.layers[divname].left; 
    else if (isIE4 || isIE5) var posLeft = document.all(divname).style.pixelLeft; 
    else if (isNS6) var posLeft = parseInt(document.getElementById(divname).style.left + ""); 
    return posLeft; 
} 
function giveposY(divname) { 
    if (isNS4) var posTop = document.layers[divname].top; 
    else if (isIE4 || isIE5) var posTop = document.all(divname).style.pixelTop; 
    else if (isNS6) var posTop = parseInt(document.getElementById(divname).style.top + ""); 
    return posTop; 
} 
function setposX(divname, xpos) { 
    if (isNS4) document.layers[divname].left = xpos; 
    else if (isIE4 || isIE5) document.all(divname).style.pixelLeft = xpos; 
    else if (isNS6) document.getElementById(divname).style.left = xpos; 
} 
function setposY(divname, ypos) { 
    if (isNS4) document.layers[divname].top = ypos; 
    else if (isIE4 || isIE5) document.all(divname).style.pixelTop = ypos; 
    else if (isNS6) document.getElementById(divname).style.top = ypos; 
} 
function givesize(divname, dimension) { 
    var divsize = 0; 
        if (dimension == 'y') { 
            if (isNS4) divsize = document.layers[divname].clip.height; 
            else if (isIE4 || isIE5) divsize = document.all(divname).style.pixelHeight; 
            else if (isNS6) divsize = parseInt(document.getElementById(divname).style.height + ""); 
        } 
        else if (dimension == 'x') { 
            if (isNS4) divsize = document.layers[divname].clip.width; 
            else if (isIE4 || isIE5) divsize = document.all(divname).style.pixelWidth; 
            else if (isNS6) divsize = parseInt(document.getElementById(divname).style.width + ""); 
        } 
    return divsize; 
} 
// check to see if 'box' is touching 'enemy1' 
function checktouching(num) { 
    var enemy = "enemy" + num + "" 
    var difX = giveposX('box') - giveposX(enemy) - 0; // -0 converts to integer 
    var difY = giveposY('box') - giveposY(enemy) - 0; 
    // set touch = 1 if it is touching an enemy 
    if (difX > (-1 * givesize('box', 'x')) && difX < givesize(enemy, 'x') && difY > (-1 * givesize('box', 'y')) && difY < givesize(enemy, 'y')) { 
        touch = 1; 
    } 
    else touch = 0; 
} 
function movenemy(num,step_x,step_y){ 
    var enemy = "enemy" + num + "" 
    var enemyx = givesize(enemy, 'x'); 
    var enemyy = givesize(enemy, 'y'); 
    if (giveposX(enemy) >= (450 - enemyx) || giveposX(enemy) <= 0) { 
        enemyxdir[num] = -1 * enemyxdir[num]; 
        } 
    if (giveposY(enemy) >= (450 - enemyy) || giveposY(enemy) <= 0) { 
        enemyydir[num] = -1 * enemyydir[num]; 
        } 
    var newposx = giveposX(enemy) + (step_x*enemyxdir[num]) + 0; 
    var newposy = giveposY(enemy) + (step_y*enemyydir[num]) + 0; 
    setposX(enemy, newposx); 
    setposY(enemy, newposy); 
    checktouching(num + ""); 
    if (touch == 1) { 
        stop(); reset(); 
        } 
} 
function movenemies() { 
    gametime = gametime + 1 
    if (gametime >= 0 && gametime < 100) speed = 80; 
    else if (gametime >= 100 &&  gametime < 200) speed = 60; 
    else if (gametime >= 200 &&  gametime < 300) speed = 40; 
    else if (gametime >= 300 &&  gametime < 400) speed = 30; 
    else if (gametime >= 400 &&  gametime < 500) speed = 20; 
    else speed = 10; 
    // window.status = "speed:  " + speed + "   gametime: " + gametime; 
    movenemy(0,-10,12); 
    movenemy(1,-12,-20); 
    movenemy(2,15,-13); 
    movenemy(3,17,11); 
    setTimeout(movenemies,speed); 
} 
function start(e) { 
    if (started == 0) {    movenemies();     startclock();     started = 1;    } 
    curX = (isNS4 || isNS6) ? e.pageX : window.event.x ; 
    curY = (isNS4 || isNS6) ? e.pageY : window.event.y ; 
    curX2 = eval(curX - 40); 
    curY2 = eval(curY - 40); 
    boxX = eval(curX - 20); 
    boxY = eval(curY - 20); 
    var boxleft = giveposX('box'); 
    var boxtop = giveposY('box'); 
    if (curX > boxleft && curX2 < boxleft && curY > boxtop && curY2 < boxtop) { 
        moving = 1; 
        setposX('box', boxX); 
        setposY('box', boxY); 
        if (isNS4 || isNS6){ 
        document.captureEvents(Event.MOUSEMOVE); 
        } 
    } 
} 
function stop(e){ 
    moving=0; 
    if (isNS4 || isNS6){ 
    document.releaseEvents(Event.MOUSEMOVE); 
    } 
} 
function reset(e){ 
    endclock(); 
    moving=0; 
    if (isNS4 || isNS6){ 
        document.releaseEvents(Event.MOUSEMOVE); 
        } 
    if (finaltime == 0) { 
        finaltime = calctime(); 
        window.alert('你坚持了 ' + finaltime + ' 秒... 还可以加油！'); 
//        var entername = window.confirm('Enter your name?'); 
//            if (entername) { 
//            window.open("?" + finaltime,'winwin','width=300,height=500,left=40,top=40,status=1,resizable'); 
//            document.location.reload(); 
//            } 
//            else document.location.reload(); 
            window.close(); 
        } 
} 
function checkLocation(e){ 
        curX = (isNS4 || isNS6) ? e.pageX : window.event.x ; 
        curY = (isNS4 || isNS6) ? e.pageY : window.event.y ; 
        boxX = eval(curX - 20); 
        boxY = eval(curY - 20); 
    checktouching('1'); 
    if (moving == 1 && touch == 0){ 
            setposX('box',boxX); 
            setposY('box',boxY); 
            if (curY > 69 && curX > 69 && curY < 381 && curX < 381) return false; 
            else stop(); reset(); 
    } 
    else if (touch == 1){ 
    stop(); reset(); 
    } 
} 
</SCRIPT> 
<META content="MSHTML 6.00.2800.1106" name=GENERATOR></HEAD> 
<BODY text=#000000 bgColor=#ffffff leftMargin=0 topMargin=0 marginwidth="0" 
marginheight="0"> 
<DIV id=box 
style="LEFT: 205px; WIDTH: 40px; POSITION: absolute; TOP: 205px; HEIGHT: 40px; BACKGROUND-COLOR: #990000; layer-background-color: #990000"> 
<TABLE height=40 width=40> 
  <TBODY> 
  <TR> 
    <TD></TD></TD></TR></TBODY></TABLE></DIV> 
<DIV id=enemy0 
style="LEFT: 270px; WIDTH: 60px; POSITION: absolute; TOP: 60px; HEIGHT: 50px; BACKGROUND-COLOR: #000099; layer-background-color: #000099"> 
<TABLE height=50 width=60> 
  <TBODY> 
  <TR> 
    <TD></TD></TR></TBODY></TABLE></DIV> 
<DIV id=enemy1 
style="LEFT: 300px; WIDTH: 100px; POSITION: absolute; TOP: 330px; HEIGHT: 20px; BACKGROUND-COLOR: #000099; layer-background-color: #000099"> 
<TABLE height=20 width=100> 
  <TBODY> 
  <TR> 
    <TD>?</TD></TR></TBODY></TABLE></DIV> 
<DIV id=enemy2 
style="LEFT: 70px; WIDTH: 30px; POSITION: absolute; TOP: 320px; HEIGHT: 60px; BACKGROUND-COLOR: #000099; layer-background-color: #000099"> 
<TABLE height=60 width=30> 
  <TBODY> 
  <TR> 
    <TD>?</TD></TR></TBODY></TABLE></DIV> 
<DIV id=enemy3 
style="LEFT: 70px; WIDTH: 60px; POSITION: absolute; TOP: 70px; HEIGHT: 60px; BACKGROUND-COLOR: #000099; layer-background-color: #000099"> 
<TABLE height=60 width=60> 
  <TBODY> 
  <TR> 
    <TD>?</TD></TR></TBODY></TABLE></DIV> 
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<div style="position: absolute; width: 285px; height: 293px; z-index: 1; left: 467px; top: 32px" id="layer1"> 
点击按住红色部分即开始：<br />
拖动红块，避免碰到蓝色部分 <br />
也不要碰到黑色边界区域。 <br />
如果你能达到18秒以上，你是个天才。 <br />
据说，美国空军的飞行员 <br />
被强制达到2分钟.</div> 
</BODY>
</HTML>