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function getStr(url)
{
var len = url.length;
var str="";
for(var i=0;i<len;i++)
{
var s = url.substr(len-i,1);
if( s != "/")
{
str = s + str;
}
else
{
return str;
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var url;
//url = window.location.href;
url = "http://www.***.com/daxiaa/qq123"
alert(getStr(url));
</script>