一维数组的访问 和 二维数组的访问

一维数组的访问

    <script>
        var color = ["red","orange","yellow","green","cyan","blue","purple"];//一维数组
        console.log(color[2])
        for(var i=0; i<color.length; i++){//遍历
            document.write(color[i] + "<br />")
        }
    </script>

二维数组的访问

<script>
        var china = [//二维数组            ["承德","唐山","邯郸","保定","张家口","邢台",],
            ["郑州","驻马店","信阳","安阳","洛阳","周口",],
            ["太原","大同","朔州","忻州","阳泉","吕梁",]
        ]
        //console.log(china[1][2])
        for(var i=0; i<china.length; i++){//一维
            for(j=0; j<china[i].length; j++){
                console.log(china[i][j])
            }
        }
</script>