解决Layui动态添加表单元素后渲染失效的问题

$.post('http://4646464645',{adcode:data.value},function(d){
 var o= eval('(' +d+')');
 var municipalityStr = '';
 if (o.status==1) {
 for (var i = 0; i < o.districts[0].districts.length; i++) {
  municipalityStr +='<option value="'+o.districts[0].districts[i].adcode+'">'+o.districts[0].districts[i].name+'</option>';
 }
 }
 $("#municipality").append(municipalityStr);
 form.render();
});