遊戲等級var是undefined

我正在製作一個有多個關卡的html5遊戲。他們（不正確）被定義，因爲我得到錯誤Uncaught TypeError: Cannot read property 'length' of undefined。我認爲我的var格式不正確。應該怎麼做？遊戲等級var是undefined

var levels = ([ 
     { factor: 1.2, duration: 100, multiplier: 0.5 }, 
     { factor: 1.5, duration: 200, multiplier: 0.6 }, 
     { factor: 1.9, duration: 300, multiplier: 0.7 }, 
     { factor: 2.3, duration: 450, multiplier: 0.8 }, 
     { factor: 2.8, duration: 600, multiplier: 1.0 }, 
     { factor: 3.3, duration: 800, multiplier: 1.1 }, 
     { factor: 3.9, duration: 1000, multiplier: 1.3 }, 
     { factor: 4.4, duration: 1500, multiplier: 1.7 }, 
     { factor: 5.6, duration: 2000, multiplier: 2.0 } 
    ] [ 
     { factor: 1.2, duration: 100, multiplier: 0.5 }, 
     { factor: 1.8, duration: 200, multiplier: 0.6 }, 
     { factor: 2.3, duration: 300, multiplier: 0.7 }, 
     { factor: 2.5, duration: 450, multiplier: 0.8 }, 
     { factor: 3.2, duration: 600, multiplier: 1.0 }, 
     { factor: 3.6, duration: 800, multiplier: 1.1 }, 
     { factor: 4.0, duration: 1100, multiplier: 1.3 }, 
     { factor: 4.8, duration: 1700, multiplier: 1.7 }, 
     { factor: 5.6, duration: 2400, multiplier: 2.0 } 
    ] 
    ); 

function generateLevelSelector() { 
     var html = ''; 

     for(var i = 1, len = levels.length; i <= len; i++) { 
      html += '<li data-level="' + i + '">' + i + '</li>' 
     } 

     // Find the list element that will hold all levels 
     var list = levelSelector.getElementsByTagName('ul')[0]; 

     list.innerHTML = html; 

     var listItems = levelSelector.getElementsByTagName('li'); 

     for(var i = 0, len = listItems.length; i < len; i++) { 
      listItems[i].addEventListener('click', levelSelectedHandler, false); 
     } 

     updateLevelSelector(); 

    }

來源

2014-06-20 Justin Picard

哪條線發生錯誤？在'for ....（。levels.length; ....）'或'for ...（... listItems.length; ....）'處？如果後者'levelSelector.getElementsByTagName（'li'）;可能會返回undefined/null！ – MABVT

for（var i = 1，len = levels.length; i <= len; i ++）{ –

敷在[]中的代替（）

var levels = [[ 
     { factor: 1.2, duration: 100, multiplier: 0.5 }, 
     { factor: 1.5, duration: 200, multiplier: 0.6 }, 
     { factor: 1.9, duration: 300, multiplier: 0.7 }, 
     { factor: 2.3, duration: 450, multiplier: 0.8 }, 
     { factor: 2.8, duration: 600, multiplier: 1.0 }, 
     { factor: 3.3, duration: 800, multiplier: 1.1 }, 
     { factor: 3.9, duration: 1000, multiplier: 1.3 }, 
     { factor: 4.4, duration: 1500, multiplier: 1.7 }, 
     { factor: 5.6, duration: 2000, multiplier: 2.0 } 
    ], [ 
     { factor: 1.2, duration: 100, multiplier: 0.5 }, 
     { factor: 1.8, duration: 200, multiplier: 0.6 }, 
     { factor: 2.3, duration: 300, multiplier: 0.7 }, 
     { factor: 2.5, duration: 450, multiplier: 0.8 }, 
     { factor: 3.2, duration: 600, multiplier: 1.0 }, 
     { factor: 3.6, duration: 800, multiplier: 1.1 }, 
     { factor: 4.0, duration: 1100, multiplier: 1.3 }, 
     { factor: 4.8, duration: 1700, multiplier: 1.7 }, 
     { factor: 5.6, duration: 2400, multiplier: 2.0 } 
    ] 
    ];

來源

2014-06-20 08:59:18 hansn

你的陣列創建似乎已損壞。

var levels = [ // <--- round brackes only with new Array, in this case square brackets 
[ 
    { factor: 1.2, duration: 100, multiplier: 0.5 }, 
    { factor: 1.5, duration: 200, multiplier: 0.6 }, 
    { factor: 1.9, duration: 300, multiplier: 0.7 }, 
    { factor: 2.3, duration: 450, multiplier: 0.8 }, 
    { factor: 2.8, duration: 600, multiplier: 1.0 }, 
    { factor: 3.3, duration: 800, multiplier: 1.1 }, 
    { factor: 3.9, duration: 1000, multiplier: 1.3 }, 
    { factor: 4.4, duration: 1500, multiplier: 1.7 }, 
    { factor: 5.6, duration: 2000, multiplier: 2.0 } 
], // <--- MISSED COMMA? 
[ 
    { factor: 1.2, duration: 100, multiplier: 0.5 }, 
    { factor: 1.8, duration: 200, multiplier: 0.6 }, 
    { factor: 2.3, duration: 300, multiplier: 0.7 }, 
    { factor: 2.5, duration: 450, multiplier: 0.8 }, 
    { factor: 3.2, duration: 600, multiplier: 1.0 }, 
    { factor: 3.6, duration: 800, multiplier: 1.1 }, 
    { factor: 4.0, duration: 1100, multiplier: 1.3 }, 
    { factor: 4.8, duration: 1700, multiplier: 1.7 }, 
    { factor: 5.6, duration: 2400, multiplier: 2.0 } 
] 
];

來源

2014-06-20 09:02:27 MABVT

遊戲等級var是undefined

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