var acity=[0, 1, 2, 3, 4]
acity[0]=["---请选择---"]
acity[1]=["广州市", "深圳市", "珠海市"]
acity[2]=["--请选择--", "长沙市", "湘潭市"]
acity[3]=["--请选择--", "杭州市", "温州市"]
alert(acity)//正确显示var a=[1,2,3,4,5]
a[0][0]=1;
a[0][1]=2
alert(a[0][0])//undefined
acity[0]=["---请选择---"]
acity[1]=["广州市", "深圳市", "珠海市"]
acity[2]=["--请选择--", "长沙市", "湘潭市"]
acity[3]=["--请选择--", "杭州市", "温州市"]
alert(acity)//正确显示var a=[1,2,3,4,5]
a[0][0]=1;
a[0][1]=2
alert(a[0][0])//undefined
var aCity=[];
aCity[0]=[];
aCity[1]=[];
aCity[2]=[];
aCity[3]=[];
aCity[0][0]="--请选择--";
aCity[1][0]="--请选择--";
aCity[1][1]="广州市";
aCity[1][2]="深圳市";
aCity[1][3]="珠海市";
aCity[2][0]="--请选择--";
aCity[2][1]="长沙市";
aCity[2][2]="湘潭市";
aCity[3][0]="--请选择--";
aCity[3][1]="杭州市";
aCity[3][2]="温州市"; alert(aCity)
所以不会出错
var aCity=[];
aCity[0]=[];
aCity[1]=[];
aCity[2]=[];
aCity[3]=[];
aCity[0]=["--请选择--","--请选择--"];
aCity[1]=["广州市","深圳市"];
是一种声明
还有可以这样
var acity=new Array(n);
for(var i=0;i<acity.length;i++){
acity[i]=new Array(n)
for(var j=0;j<acity[i].length;j++){
acity[i][j]=xxx
}
}
a[0][0]=1;
a[0][1]=2;
alert(a[0][0]);
或者
var a=[1,2,3,4,5];
a[0]=[1,2];
alert(a[0][0]);