Javascript索引对象内的数组

Question

我错过了一个简单的语法规则，所以也许你可以指出我。

我

var board = { 
    //this data structure was heavily discussed with Lydia Brothers. its current form is due to her help 
    state: { 
    flipped: true, 
    ballWasDroppedLastMove: false, 
    topPlace: 0, 
    bottomPlace: 0, 
    top: [[1,2,3,4,5,6],[7,8,9,10,11,99],[12,13,14,15,99,99],[16,17,18,99,99,99],[19,20,99,99,99,99],[21,99,99,99,99,99]], 
    bottom: [[0,0,0,0,0,0],[0,0,0,0,0,99], [0,0,0,0,99,99], [0,0,0,99,99,99], [0,0,99,99,99,99], [0,99,99,99,99,99]], 
    }, ... 

的我做对象的某些操作定义为跟随对象... - 尤其是我感兴趣的board.state.top。

当我打印board.state.top到控制台我得到类似下面的图片...

我要访问的值12,11,0,0,99,99。

我从其他语言的经验告诉我，我应该做这样的事情...

for (i=0; i<6; i++){ 
    console.log(pboard.state.top[i]) 
} 

...，这就是我究竟是如何得出上述形象。我试过类似board.state.top[i][j]（增加额外的尺寸），但打印的值0,0,0,0,99,99

如何访问这些元素？

如下的建议，我尝试了以下（无范围）...

var i; 
var j; 
for (i=0; i<6; i++){ 
    row = pboard.state.top[i]; 
    row.forEach(element => {console.log(element);}); 
    // for (j=0; j<6; j++){ 
    // console.log(top[j]) 
    // } 
} 

Answer 1

为了简化问题，做一个系统的订单。

首先从属性board.state.top检索array并将其存储在一个变量中。

然后使用forEach API遍历元素。

实施例：

var board = { 
 
    //this data structure was heavily discussed with Lydia Brothers. its current form is due to her help 
 
    state: { 
 
    flipped: true, 
 
    ballWasDroppedLastMove: false, 
 
    topPlace: 0, 
 
    bottomPlace: 0, 
 
    top: [[1, 2, 3, 4, 5, 6], [7, 8, 9, 10, 11, 99], [12, 13, 14, 15, 99, 99], [16, 17, 18, 99, 99, 99], [19, 20, 99, 99, 99, 99], [21, 99, 99, 99, 99, 99]], 
 
    bottom: [[0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 99], [0, 0, 0, 0, 99, 99], [0, 0, 0, 99, 99, 99], [0, 0, 99, 99, 99, 99], [0, 99, 99, 99, 99, 99]], 
 
    } 
 
} 
 

 
var that_row = board.state.top[2]; 
 
that_row.forEach(element => { console.log(element); });

Answer 2

尝试此。它应该工作。您需要达到该值，然后逐个获得所需的值。像这样的东西

state.top.forEach(function(innerItem){ 
    innerItem.forEach(function(item){ 
     console.info(item); 
    }) 
}) 

希望它有帮助。

快乐学习:)

Answer 3

后续片段将在POS财产打印每个值吧数组：

var board = { 
 
    //this data structure was heavily discussed with Lydia Brothers. its current form is due to her help 
 
    state: { 
 
    flipped: true, 
 
    ballWasDroppedLastMove: false, 
 
    topPlace: 0, 
 
    bottomPlace: 0, 
 
    top: [[1, 2, 3, 4, 5, 6], [7, 8, 9, 10, 11, 99], [12, 13, 14, 15, 99, 99], [16, 17, 18, 99, 99, 99], [19, 20, 99, 99, 99, 99], [21, 99, 99, 99, 99, 99]], 
 
    bottom: [[0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 99], [0, 0, 0, 0, 99, 99], [0, 0, 0, 99, 99, 99], [0, 0, 99, 99, 99, 99], [0, 99, 99, 99, 99, 99]], 
 
    } 
 
} 
 

 
board.state.top.forEach(function(pos, topIndex) { 
 
    pos.forEach(function(v, i) { 
 
     console.log('From top index', topIndex, 'value in position', i, v); 
 
    }); 
 
});