基于JS实现省市联动效果代码分享

var linkDatas = {
provinces:[
{
"code":"0",
"name":"请选择"
},
{
"code":"1",
"name":"北京"
},
{
"code":"2",
"name":"天津"
},
{
"code":"3",
"name":"河北"
},
{
"code":"4",
"name":"湖北"
},
{
"code":"5",
"name":"广东"
},
{
"code":"6",
"name":"其他"
}
],
citys:{
0:[
"请选择"
],
1:[
"朝阳区",
"海淀区",
"东城区",
"西城区",
"房山区",
"其他"
],
2:[
"天津"
],
3:[
"沧州",
"石家庄",
"秦皇岛",
"其他"
],
4:[
"武汉市",
"宜昌市",
"襄樊市",
"其他"
],
5:[
"广州市",
"深圳市",
"汕头市",
"佛山市",
"珠海市",
"其他"
],
6:[
"其他"
]
}
};

function addOptions(target,options){
var optionEle = null,
target = target,
option = options,
optionLen = options.length;
for(var i = 0;i < optionLen;i++){
optionEle = document.createElement('option');
optionEle.value = option[i].value;
optionEle.text = option[i].text;
target.options.add(optionEle);
}
}

pro.onchange = function(){
console.log(this);
var ct = city[this.value],
ctLen = ct.length,
ctBox = [];
c.innerHTML = ""; 
/*添加城市*/ 
for(var j = 0;j < ctLen;j++){
ctBox.push({
"text" : ct[j],
"value": ct[j]
});
}
addOptions(c,ctBox);
}

<div class="content">
<h3>下拉框联动效果</h3>
<p>省份：
<select name="provinces" id="provinces">
</select>
</p>
<p>
市：
<select name="citys" id="citys">
</select>
</p>
</div>

var linkDatas = {
provinces:[
{
"code":"0",
"name":"请选择"
},
{
"code":"1",
"name":"北京"
},
{
"code":"2",
"name":"天津"
},
{
"code":"3",
"name":"河北"
},
{
"code":"4",
"name":"湖北"
},
{
"code":"5",
"name":"广东"
},
{
"code":"6",
"name":"其他"
}
],
citys:{
0:[
"请选择"
],
1:[
"朝阳区",
"海淀区",
"东城区",
"西城区",
"房山区",
"其他"
],
2:[
"天津"
],
3:[
"沧州",
"石家庄",
"秦皇岛",
"其他"
],
4:[
"武汉市",
"宜昌市",
"襄樊市",
"其他"
],
5:[
"广州市",
"深圳市",
"汕头市",
"佛山市",
"珠海市",
"其他"
],
6:[
"其他"
]
}
};
function addOptions(target,options){
var optionEle = null,
target = target,
option = options,
optionLen = options.length;
for(var i = 0;i < optionLen;i++){
optionEle = document.createElement('option');
optionEle.value = option[i].value;
optionEle.text = option[i].text;
target.options.add(optionEle);
}
}
function provincesCitysLink(pro,c){
var LD = linkDatas,
provinces = LD.provinces,
city = LD.citys,
initCity = city[0],
proBox = [];
/*添加省份*/
for(var i = 0;i < provinces.length;i++){
proBox.push({
"text" : provinces[i].name,
"value": provinces[i].code
})
} 
addOptions(pro,proBox);
/*初始化城市*/
addOptions(c,[{
"text" : initCity,
"value": initCity
}]);
/*添加联动事件*/
pro.onchange = function(){
console.log(this);
var ct = city[this.value],
ctLen = ct.length,
ctBox = [];
c.innerHTML = ""; 
/*添加城市*/ 
for(var j = 0;j < ctLen;j++){
ctBox.push({
"text" : ct[j],
"value": ct[j]
});
}
addOptions(c,ctBox);
}
}
var provinces = document.getElementById('provinces'),
citys = document.getElementById('citys');
provincesCitysLink(provinces,citys);