js实现简单的省市县三级联动效果实例_javascript技巧

//省市县数据格式
var province_city_county_data=[
  {
    province:"四川",
    city:[
      {
        cityName:"成都",
        county:["成都市","崇州市","金堂县"]
      },
      {
        cityName:"南充",
        county:["仪陇县","南部县","营山县"]
      }
    ]
  },
  {
    province:"北京",
    city:[
      {  cityName:"北京市",
        county:["东城区","朝阳区"]
      }
    ]
  },
  {
    province:"安徽",
    city:[
      {  cityName:"安庆",
        county:["安庆市","怀宁县","潜山县"]
      },
      {  cityName:"蚌埠",
        county:["蚌埠市","固镇县","怀远县"]
      }
    ]
  }
]
var opt0 = ["省份","地级市","市、县级市、县"];
var selectID_arr2=["provinceid","cityid","countyid"];
var province_index;
window.onload = function(){
  //初始化下拉框
  function init_select(){
    init_title();
    init_province();
    bind_province();
  }
  //初始化提示标题
  function init_title(){
    for(var k = 0;k