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js部分代码,这js在ie通过,在火狐出现错误错误: ch[a].getAttribute is not a function
function province_change( )
{
createxmldoc();
var si=document.getElementById("province").selectedIndex;
var c=document.getElementById("city");
c.length=0;
var x=document.getElementById("xian");
x.length=0;
var ch=xmlDoc.getElementsByTagName("PROVINCE")[si].childNodes;
var xch=xmlDoc.getElementsByTagName("PROVINCE")[si].childNodes[0].childNodes;
for(var a=0;a