$.ajax({ 
type: "POST", 
url: root + "/xxx, 
data: requestData, 
dataType: "json", 
success: function(data){ 
// 清空列表 
$("#formOpinion #listLeft").empty(); 
$.each(data, 
function(i, $data) { 
var $option = $("<option name='opinion.tag' value=" 
+ $data.code + $data.name + ">" + $data.code 
+ $data.name + "</option>"); 
// 绑定数据到listLeft 
$("#formOpinion #listLeft").append($option); 
}); 
} 
});