document.getElementById('region_1').innerHTML+='<select name=regCity_2 id=regCity_2 ><option value=0 selected=selected >历下区</option><option value=1>市中区</option><option value=2>槐荫区</option><option value=3>天桥区</option><option value=4>历城区</option><option value=5>高新区</option><option value=6>长清区</option><option value=7>平阴县</option><option value=8>济阳县</option><option value=9>商河县</option><option value=10>章丘市</option></select>'