２次元配列を作り、変数に代入する方法と、２次元配列の要素にアクセスする方法。
解説
２次元配列を作る
１次元配列の要素の値を、配列にするだけで、２次元配列を作ることができる。
[]で括る方法
<script type="text/javascript">
var sampleArray = [
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
];
</script>
var sampleArray = [
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
];
</script>
new Array()
<script type="text/javascript">
var sampleArray = new Array(
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
);
</script>
var sampleArray = new Array(
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
);
</script>
Array()
<script type="text/javascript">
var sampleArray = Array(
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
);
</script>
var sampleArray = Array(
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
);
</script>
２次元配列の要素にアクセス
インデックスを2つ指定すれば、２次元配列の要素にアクセスできる。
<script type="text/javascript">
sampleArray[0][0] // 要素１－１
sampleArray[0][2] // 要素１－３
sampleArray[1][0] // 要素２－１
sampleArray[2][1] // 要素３－２
</script>
sampleArray[0][0] // 要素１－１
sampleArray[0][2] // 要素１－３
sampleArray[1][0] // 要素２－１
sampleArray[2][1] // 要素３－２
</script>
サンプル
[]で括る方法
ソースコード
<script type="text/javascript">
var sampleArray = [
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
];
for( index = 0; index < sampleArray . length; index++ ){
document . write( sampleArray[index][0] + " : " );
document . write( sampleArray[index][1] + " : " );
document . write( sampleArray[index][2] + "<br />" );
}
</script>
var sampleArray = [
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
];
for( index = 0; index < sampleArray . length; index++ ){
document . write( sampleArray[index][0] + " : " );
document . write( sampleArray[index][1] + " : " );
document . write( sampleArray[index][2] + "<br />" );
}
</script>
new Array()
ソースコード
<script type="text/javascript">
var sampleArray = new Array(
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
);
for( index = 0; index < sampleArray . length; index++ ){
document . write( sampleArray[index][0] + " : " );
document . write( sampleArray[index][1] + " : " );
document . write( sampleArray[index][2] + "<br />" );
}
</script>
var sampleArray = new Array(
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
);
for( index = 0; index < sampleArray . length; index++ ){
document . write( sampleArray[index][0] + " : " );
document . write( sampleArray[index][1] + " : " );
document . write( sampleArray[index][2] + "<br />" );
}
</script>
Array()
ソースコード
<script type="text/javascript">
var sampleArray = Array(
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
);
for( index = 0; index < sampleArray . length; index++ ){
document . write( sampleArray[index][0] + " : " );
document . write( sampleArray[index][1] + " : " );
document . write( sampleArray[index][2] + "<br />" );
}
</script>
var sampleArray = Array(
[ "要素１－１", "要素１－２", "要素１－３" ],
[ "要素２－１", "要素２－２", "要素２－３" ],
[ "要素３－１", "要素３－２", "要素３－３" ]
);
for( index = 0; index < sampleArray . length; index++ ){
document . write( sampleArray[index][0] + " : " );
document . write( sampleArray[index][1] + " : " );
document . write( sampleArray[index][2] + "<br />" );
}
</script>