javascript数组

var city = new Array(3);
city[0]= new Array("普陀","黄浦");
city[1]= new Array("武汉","黄石");
city[2]= new Array("昌平","保定");
for(i=0;i<city.length;i++){
	for(j=0;j<city[j].length;j++){
		document.write(city[i][j]);
		document.write("<br>");
	}
}
document.write(city[0].toString());
document.write("<br>");
document.write(city[1].join("@"));
document.write("<br>");
document.write(city[1].reverse().join());
document.write("<br>");
document.write(city[1].join("@").split("@"));