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<script langauge="javascript">
var _Array = [];
_Array[_Array.length] = ['中国', ['北京', ['北京', '红灯区', '绿灯区'], ['aaa22', 'aaaa333', 'aaaa444']], ['江西', ['aaa33', 'aaaa555', 'aaaa666'], ['aaa44', 'aaaa777', 'aaaa888']]];
_Array[_Array.length] = ['美国', ['bb1', ['bbb11', 'bbbb111', 'bbbb222'], ['bbb22', 'bbbb333', 'bbbb444']], ['bb2', ['bbb33', 'bbbb555', 'bbbb666'], ['bbb44', 'bbbb777', 'bbbb888']]];
_Array[_Array.length] = ['朝鲜', ['cc1', ['ccc11', 'cccc111', 'cccc222'], ['ccc22', 'cccc333', 'cccc444']], ['cc2', ['ccc33', 'cccc555', 'cccc666'], ['ccc44', 'cccc777', 'cccc888']]];
function chgI(){
var SelI = document.all('SelI');
var SelII = document.all('SelII');
var ValueI = SelI.options[SelI.selectedIndex].value;
for(var x=SelII.options.length-1; x>=0; x--){
SelII.options[x] = null;
}
for(var a=0; a<_Array.length; a++){
if(_Array[a][0]==ValueI){
for(var b=1; b<_Array[a].length; b++){
SelII.options.add(new Option(_Array[a][b][0], _Array[a][b][0]));
}
chgII();
return;
}
}
}
function chgII(){
var SelI = document.all('SelI');
var SelII = document.all('SelII');
var SelIII = document.all('SelIII');
var ValueI = SelI.options[SelI.selectedIndex].value;
var ValueII = SelII.options[SelII.selectedIndex].value;
for(var x=SelIII.options.length-1; x>=0; x--){
SelIII.options[x] = null;
}
for(var a=0; a<_Array.length; a++){
if(_Array[a][0]==ValueI){
for(var b=1; b<_Array[a].length; b++){
if(_Array[a][b][0]==ValueII){
for(var c=1; c<_Array[a][b].length; c++){
SelIII.options.add(new Option(_Array[a][b][c][0], _Array[a][b][c][0]));
}
chgIII();
return;
}
}
}
}
}
function chgIII(){
var SelI = document.all('SelI');
var SelII = document.all('SelII');
var SelIII = document.all('SelIII');
var SelIV = document.all('SelIV');
var ValueI = SelI.options[SelI.selectedIndex].value;
var ValueII = SelII.options[SelII.selectedIndex].value;
var ValueIII = SelIII.options[SelIII.selectedIndex].value;
for(var x=SelIV.options.length-1; x>=0; x--){
SelIV.options[x] = null;
}
for(var a=0; a<_Array.length; a++){
if(_Array[a][0]==ValueI){
for(var b=1; b<_Array[a].length; b++){
if(_Array[a][b][0]==ValueII){
for(var c=1; c<_Array[a][b].length; c++){
if(_Array[a][b][c][0]==ValueIII){
for(var d=1; d<_Array[a][b][c].length; d++){
SelIV.options.add(new Option(_Array[a][b][c][d], _Array[a][b][c][d]));
}
}
}
return;
}
}
}
}
}
function window.onload(){
var SelI = document.all('SelI');
var SelII = document.all('SelII');
for(var i=0; i<_Array.length; i++){
SelI.options.add(new Option(_Array[i][0], _Array[i][0]));
}
SelI.selectedIndex = 0;
}
</script>
国家<select id="SelI" onchange="if(selectedIndex!=0){ chgI(); }"><option>选择</option></select>
省<select id="SelII" onchange="chgII();"></select>
城市<select id="SelIII" onchange="chgIII();"></select>
区<select id="SelIV"></select>