保存值
function setActiveLayer() {
var n;
var f = document.forms[0];
var m = parent.MapFrame;
var index = f.active.selectedIndex;
m.ActiveLayerId = f.active.options[index].value;
var p = parent.PostFrame.document.forms[0];
var index1 = -1;
for (var t=0;t< m.layerCount;t++) {
if (m.ActiveLayerId==m.LayerID[t]) {
n=t;
}
}怎么把n的值保存下来