配列、連想配列

var eto=new Array();
eto[0] = "子";
eto[1] = "牛";
eto[2] = "寅";
eto[4] = "馬";

day = new Array("Sun", "Mon", "Thu");

//連想配列、番号ではなくて、文字列で指定

var week=new Array();
week["sun"] = "日曜日";
week["mon"] = "月曜日";
week["tue"] = "火曜日";
week["wed"] = "水曜日";
week["thu"] = "木曜日";
week["fri"] = "金曜日";
week["sat"] = "土曜日";