是否多次执行jQuery.bind？

原始代码：（可以在此处看到工作：）

/*google.setOnLoadCallback（函数（）{*/
$（函数（）{
jqr=新对象（）；
jqr.settings=新对象（）；
jqr.settings.sprite_width=16；
jqr.settings.sprite_height=16；
jqr.settings.space=false；
jqr.p=新对象（）；
函数jqrpgreetplayer（）{
jqr.p.face='d'；
jqr.p.x=3；
jqr.p.y=3；
jqr.p.state='map'；
}
jqr.map=新对象（）；
jqr.map.height=16；
jqr.map.width=16；
jqr.map.terrain=[
'01','02','03','11','11','11','11','11','11','11','11','11','11','11','11','11',
'01','01','00','00','11','00','00','11','11','00','00','00','00','00','00','00',
'01','00','00','00','11','00','00','00','00','11','00','00','00','00','00','00',
'01','00','00','00','00','00','00','11','00','11','00','00','00','00','00','00',
'01','00','00','00','00','00','00','11','00','11','11','11','11','00','00','00',
'00','00','00','00','00','11','11','00','00','00','00','00','11','00','00','00',
'00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
'00','00','00','00','00','00','00','00','00','00','00','00','00','00','00','00',
'00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
'00','00','00','00','00','00','00','00','00','00','00','00','11','00','00','00',
'00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
'00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
'00','00','00','00','00','00','00','00','00','11','00','00','11','01','01','01',
'00','00','00','00','00','00','00','00','00','11','11','11','00','00','00','01',
'00','00','00','00','00','00','00','00','00','00','00','00','00','00','00','00',
'00','00','00','00','00','00','00','00','00','00','00','00','00','00','00','00',
];
jqr.map.terrain\u可步行=[
'00','01','02',
];
jqr.battle=新对象（）；
jqrpgBuildMapHtml（）；
JQRPGUpdateMapClass（）；
jqrpgreetplayer（）；
jqrpgSetPlayerFace（jqr.p.face）；
jqrpgSetPlayer（jqr.p.x，jqr.p.y）；
jqrpgBindKeys（）；
/**
*只打一次电话
*/
函数jqrpgBuildInterface（）{
$（'jqrpg_wrapper'）.width（$（'jqrpg_screen'）.width（））；
}
函数jqrpgBuildMapHtml（）{
$（“#jqrpg_屏幕，#jqrpg_包装器”）.height（jqr.map.height*jqr.settings.sprite_height）
.width（jqr.map.width*jqr.settings.sprite\u width）；
m=$（'jqrpg_map'）；
m、 空（）；
对于（y=0；yjqr.map.width
||jqr.p.y+新_y+1>jqr.map.height
||jqr.p.x+new_x+1==0
||jqr.p.y+新的y+1==0
||！jqrpgitilewalkable（jqr.p.x+new_x，jqr.p.y+new_y）
)返回；
jqr.p.x+=new\ux；jqr.p.y+=new\uy；
$（'jqrpg_player'）.dequeue（）.animate({
左：jqr.p.x*jqr.settings.sprite_width，
顶部：jqr.p.y*jqr.settings.sprite\u高度
},
250,
函数（）{
jqrpGetRandomBattle（）；
});
返回true；
}
函数jqrpgIsTileWalkable（x，y）{
返回jQuery.inArray（jqr.map.terray[（y）*16+x]，jqr.map.terrain\u walkable）>-1；
}
/**
*战斗
*/
函数jqrpgGetRandomBattle（）{
风险值可能性=数学下限（数学随机（）*6）+1；
如果（可能性==1）{
jqrpgBattleInit（）；
}
}
函数jqrpgBattleInit（）{
jqr.p.state='战斗'；
m=$（“#jqrpg_菜单”）；
m、 show（）；
// 
$（'jqrpg_wrapper'）.css（{'border-color'：'a00'}）；
}
函数jqrpgBattle（）{
if（jqr.settings.space）{
jqr.settings.space=false；
jqrpgallend（）；
}
}
函数JQRPGBATTELEND（）{
jqr.p.state='map'；
$（'jqrpg_wrapper'）.css（{'border-color'：'000'}）；
m、 淡出（“快速”）；
}
});

我的代码：（可以在这里看到工作：）

$（函数（）{
jqr=新对象（）；
jqr.settings=新对象（）；
jqr.settings.sprite_width=16；
jqr.settings.sprite_height=16；
jqr.se
/* google.setOnLoadCallback(function() { */
$(function() {

jqr = new Object();
jqr.settings = new Object();
jqr.settings.sprite_width = 16;
jqr.settings.sprite_height = 16;
jqr.settings.space = false;

jqr.p = new Object();
function jqrpgResetPlayer() {
    jqr.p.face = 'd';
    jqr.p.x = 3;
    jqr.p.y = 3;
    jqr.p.state = 'map';
}

jqr.map = new Object();
jqr.map.height  = 16;
jqr.map.width   = 16;
jqr.map.terrain = [
 '01','02','03','11','11','11','11','11','11','11','11','11','11','11','11','11',
 '01','01','00','00','11','00','00','11','11','00','00','00','00','00','00','00',
 '01','00','00','00','11','00','00','00','00','11','00','00','00','00','00','00',
 '01','00','00','00','00','00','00','11','00','11','00','00','00','00','00','00',
 '01','00','00','00','00','00','00','11','00','11','11','11','11','00','00','00',
 '00','00','00','00','00','11','11','00','00','00','00','00','11','00','00','00',
 '00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','00','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','00','00','00','11','00','00','00',
 '00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','11','00','00','11','01','01','01',
 '00','00','00','00','00','00','00','00','00','11','11','11','00','00','00','01',
 '00','00','00','00','00','00','00','00','00','00','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','00','00','00','00','00','00','00',
];
jqr.map.terrain_walkable = [
 '00','01','02',
];

jqr.battle = new Object();

jqrpgBuildMapHtml();
jqrpgUpdateMapClasses();
jqrpgResetPlayer();
jqrpgSetPlayerFace(jqr.p.face);
jqrpgSetPlayer(jqr.p.x, jqr.p.y);
jqrpgBindKeys();

/**
 * only call this once
 */
function jqrpgBuildInterface() {
    $('#jqrpg_wrapper').width($('#jqrpg_screen').width());
}
function jqrpgBuildMapHtml() {
    $('#jqrpg_screen, #jqrpg_wrapper').height(jqr.map.height * jqr.settings.sprite_height)
     .width(jqr.map.width * jqr.settings.sprite_width);
    m = $('#jqrpg_map');
    m.empty();
    for (y = 0; y < jqr.map.height; y++) {
        for (x = 0; x < jqr.map.width; x++) {
            // cti = y * x; // current_tile_index
            // <![CDATA[
            m.append('<span>.</span>');
            // ]]>
        }
    }
}

/**
 * call this whenever enter a new screen
 */
function jqrpgUpdateMapClasses() {
    for (y = 0; y < jqr.map.height; y++) {
        for (x = 0; x < jqr.map.width; x++) {
            cti = y * jqr.map.height + x; // current_tile_index
            ct = $('#jqrpg_map span').eq(cti);
            ct.removeClass()
             .addClass('tile')
             .addClass('tile_x' + x + 'y'+ y)
             .addClass('tile_' + jqr.map.terrain[cti]);
            if (y && x == 0) ct.addClass('tile_row');
        }
    }
    $('#jqrpg_map').fadeIn('slow');
}
function jqrpgSetPlayerFace(new_face) {
    $('#jqrpg_player').removeClass().addClass('face_' + new_face);
}
function jqrpgSetPlayer(new_x, new_y) {
    $('#jqrpg_player').css({
     'left' : new_x * jqr.settings.sprite_width,
     'top' : new_y * jqr.settings.sprite_height
    });
}

/**
 * key binding
 */
function jqrpgBindKeys() {
    $(document).bind('keydown', 'up', function() {
        if (jqr.p.state != 'map') return false;
        jqrpgSetPlayerFace('u');
        return jqrpgMovePlayer(0, -1);
    })
    .bind('keydown', 'Down', function() {
        if (jqr.p.state != 'map') return false;
        jqrpgSetPlayerFace('d');
        return jqrpgMovePlayer(0, 1);
    })
    .bind('keydown', 'Left', function() {
        if (jqr.p.state != 'map') return false;
        jqrpgSetPlayerFace('l');
        return jqrpgMovePlayer(-1, 0);
    })
    .bind('keydown', 'Right', function() {
        if (jqr.p.state != 'map') return false;
        jqrpgSetPlayerFace('r');
        return jqrpgMovePlayer(1, 0);
    })
    .bind('keypress', 'Space', function() {
        // if (console) console.log('space');
        if (jqr.p.state == 'map') return false;
        jqr.settings.space = true;
        if (jqr.p.state == 'battle') jqrpgBattle();
        return true;
    });
}

/**
 * movement
 */
function jqrpgMovePlayer(new_x, new_y) {
    // if (console) console.log('x: ' + jqr.p.x + '  y: ' + jqr.p.y);
    if (jqr.p.x + new_x + 1 > jqr.map.width
     || jqr.p.y + new_y + 1 > jqr.map.height
     || jqr.p.x + new_x + 1 == 0
     || jqr.p.y + new_y + 1 == 0
     || !jqrpgIsTileWalkable(jqr.p.x + new_x, jqr.p.y + new_y)
    ) return;
    jqr.p.x += new_x;   jqr.p.y += new_y;

    $('#jqrpg_player').dequeue().animate({
     left: jqr.p.x * jqr.settings.sprite_width,
     top: jqr.p.y * jqr.settings.sprite_height
    },
    250,
    function() {
        jqrpgGetRandomBattle();
    });
    return true;
}
function jqrpgIsTileWalkable(x, y) {
    return jQuery.inArray(jqr.map.terrain[(y) * 16 + x], jqr.map.terrain_walkable) > -1;
}
/**
 * battle
 */
function jqrpgGetRandomBattle() {
    var likelihood = Math.floor(Math.random() * 6) + 1;
    if (likelihood == 1) {
        jqrpgBattleInit();
    }
}
function jqrpgBattleInit() {
    jqr.p.state = 'battle';
    m = $('#jqrpg_menu');
    m.show();
    // <![CDATA[
    m.html('<p>Random battle! Press [space] to continue.</p>');
    // ]]>
    $('#jqrpg_wrapper').css({'border-color' : '#a00'});
}
function jqrpgBattle() {
    if (jqr.settings.space) {
        jqr.settings.space = false;
        jqrpgBattleEnd();
    }
}
function jqrpgBattleEnd() {
    jqr.p.state = 'map';
    $('#jqrpg_wrapper').css({'border-color' : '#000'});
    m.fadeOut('fast');
}

});

$(function() {

jqr = new Object();
jqr.settings = new Object();
jqr.settings.sprite_width = 16;
jqr.settings.sprite_height = 16;
jqr.settings.space = false;

jqr.p = new Object();
function jqrpgResetPlayer() {
    jqr.p.face = 'd';
    jqr.p.x = 3;
    jqr.p.y = 3;
    jqr.p.state = 'map';
}

jqr.map = new Object();
jqr.map.height  = 16;
jqr.map.width   = 16;
jqr.map.terrain = [
 '01','02','03','11','11','11','11','11','11','11','11','11','11','11','11','11',
 '01','01','00','00','11','00','00','11','11','00','00','00','00','00','00','00',
 '01','00','00','00','11','00','00','00','00','11','00','00','00','00','00','00',
 '01','00','00','00','00','00','00','11','00','11','00','00','00','00','00','00',
 '01','00','00','00','00','00','00','11','00','11','11','11','11','00','00','00',
 '00','00','00','00','00','11','11','00','00','00','00','00','11','00','00','00',
 '00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','00','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','00','00','00','11','00','00','00',
 '00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','11','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','11','00','00','11','01','01','01',
 '00','00','00','00','00','00','00','00','00','11','11','11','00','00','00','01',
 '00','00','00','00','00','00','00','00','00','00','00','00','00','00','00','00',
 '00','00','00','00','00','00','00','00','00','00','00','00','00','00','00','00',
];
jqr.map.terrain_walkable = [
 '00','01','02',
];

jqr.battle = new Object();

jqrpgBuildMapHtml();
jqrpgUpdateMapClasses();
jqrpgResetPlayer();
jqrpgSetPlayerFace(jqr.p.face);
jqrpgSetPlayer(jqr.p.x, jqr.p.y);
jqrpgBindKeys();

/**
 * only call this once
 */
function jqrpgBuildInterface() {
    $('#jqrpg_wrapper').width($('#jqrpg_screen').width());
}
function jqrpgBuildMapHtml() {
    $('#jqrpg_screen, #jqrpg_wrapper').height(jqr.map.height * jqr.settings.sprite_height)
     .width(jqr.map.width * jqr.settings.sprite_width);
    m = $('#jqrpg_map');
    m.empty();
    for (y = 0; y < jqr.map.height; y++) {
        for (x = 0; x < jqr.map.width; x++) {
            // cti = y * x; // current_tile_index
            // <![CDATA[
            m.append('<span>.</span>');
            // ]]>
        }
    }
}

/**
 * call this whenever enter a new screen
 */
function jqrpgUpdateMapClasses() {
    for (y = 0; y < jqr.map.height; y++) {
        for (x = 0; x < jqr.map.width; x++) {
            cti = y * jqr.map.height + x; // current_tile_index
            ct = $('#jqrpg_map span').eq(cti);
            ct.removeClass()
             .addClass('tile')
             .addClass('tile_x' + x + 'y'+ y)
             .addClass('tile_' + jqr.map.terrain[cti]);
            if (y && x == 0) ct.addClass('tile_row');
        }
    }
    $('#jqrpg_map').fadeIn('slow');
}
function jqrpgSetPlayerFace(new_face) {
    $('#jqrpg_player').removeClass().addClass('face_' + new_face);
}
function jqrpgSetPlayer(new_x, new_y) {
    $('#jqrpg_player').css({
     'left' : new_x * jqr.settings.sprite_width,
     'top' : new_y * jqr.settings.sprite_height
    });
}

/**
 * key binding
 */
function jqrpgBindKeys() {
    $(document).bind('keydown', 'up', function() {
        if (jqr.p.state != 'map') return false;
        jqrpgSetPlayerFace('u');
        return jqrpgMovePlayer(0, -1);
    })
    .bind('keydown', 'Down', function() {
        if (jqr.p.state != 'map') return false;
        jqrpgSetPlayerFace('d');
        return jqrpgMovePlayer(0, 1);
    })
    .bind('keydown', 'Left', function() {
        if (jqr.p.state != 'map') return false;
        jqrpgSetPlayerFace('l');
        return jqrpgMovePlayer(-1, 0);
    })
    .bind('keydown', 'Right', function() {
        if (jqr.p.state != 'map') return false;
        jqrpgSetPlayerFace('r');
        return jqrpgMovePlayer(1, 0);
    })
    .bind('keypress', 'Space', function() {
        // if (console) console.log('space');
        if (jqr.p.state == 'map') return false;
        jqr.settings.space = true;
        if (jqr.p.state == 'battle') jqrpgBattle();
        return true;
    });
}

/**
 * movement
 */
function jqrpgMovePlayer(new_x, new_y) {
    // if (console) console.log('x: ' + jqr.p.x + '  y: ' + jqr.p.y);
    if (jqr.p.x + new_x + 1 > jqr.map.width
     || jqr.p.y + new_y + 1 > jqr.map.height
     || jqr.p.x + new_x + 1 == 0
     || jqr.p.y + new_y + 1 == 0
     || !jqrpgIsTileWalkable(jqr.p.x + new_x, jqr.p.y + new_y)
    ) return;
    jqr.p.x += new_x;   jqr.p.y += new_y;

    $('#jqrpg_player').dequeue().animate({
     left: jqr.p.x * jqr.settings.sprite_width,
     top: jqr.p.y * jqr.settings.sprite_height
    },
    250,
    function() {
        jqrpgGetRandomBattle();
    });
    return true;
}
function jqrpgIsTileWalkable(x, y) {
    return jQuery.inArray(jqr.map.terrain[(y) * 16 + x], jqr.map.terrain_walkable) > -1;
}
/**
 * battle
 */
function jqrpgGetRandomBattle() {
    var likelihood = Math.floor(Math.random() * 6) + 1;
    if (likelihood == 1) {
        jqrpgBattleInit();
    }
}
function jqrpgBattleInit() {
    jqr.p.state = 'battle';
    m = $('#jqrpg_menu');
    m.show();
    // <![CDATA[
    m.html('<p>Random battle! Press [space] to continue.</p>');
    // ]]>
    $('#jqrpg_wrapper').css({'border-color' : '#a00'});
}
function jqrpgBattle() {
    if (jqr.settings.space) {
        jqr.settings.space = false;
        jqrpgBattleEnd();
    }
}
function jqrpgBattleEnd() {
    jqr.p.state = 'map';
    $('#jqrpg_wrapper').css({'border-color' : '#000'});
    m.fadeOut('fast');
}

});

function jqrpgBindKeys() {
    $(document).bind('keydown', function(e) {
        if (jqr.p.state != 'map' && e.which != 32) return false;
        switch(e.which) {
          case 38: //up
            jqrpgSetPlayerFace('u');
            return jqrpgMovePlayer(0, -1);
          case 40: //down
            jqrpgSetPlayerFace('d');
            return jqrpgMovePlayer(0, 1);
          case 37: //left
            jqrpgSetPlayerFace('l');
            return jqrpgMovePlayer(-1, 0);
          case 39: //right
            jqrpgSetPlayerFace('r');
            return jqrpgMovePlayer(1, 0);
          case 32: //space bar
            if (jqr.p.state == 'map') return false;
            jqr.settings.space = true;
            if (jqr.p.state == 'battle') jqrpgBattle();
            return true;
        }
    });
}

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