浅谈jQuery添加的HTML,JS失效的问题

$('.provinceList').live('change', function(){ 
var provinceId = $(this).val(); 
var obj = $(this); 
$.post('/yuyue/ajaxCityList', {'provinceId':provinceId}, function(list){ 
  var data = eval( '(' + list + ')' ); 
  if( data . status == 0 ) 
  { 
    var html = '<option value="">-请选择城市-</option>'; 
    for ( var i=0; i < data . list . length; i++ ) 
    { 
      html += '<option value="'+ data . list[i] . region_id +'">' + data . list[i] . region_name + '</option>'; 
    } 
    obj.parent().find("select[name='region_id']").html(html); 
  } 
});