ajax 根据返回的json字串生成下拉选择框

var student_info = ({'name':'哈哈哈','age':20,'gender':'男'}); // 学生信息json字串

function createSelect(jsonString){

var student = eval(jsonString);

var str = "<select name='selectn'>";

str += "<option value="+student.name+">"+student.name+"</option>";

str += "<option value="+student.age+">"+student.age+"</option>";

str += "<option value="+student.gender+">"+student.gender+"</option>";

str += "</select>";

document.getElementById("tt").innerHTML = str;

}

createSelect(student_info);