JS makes address selection function
This time I will bring you the JS address selection function. What are the precautions for JS address selection function? The following is a practical case, let’s take a look.
<!DOCTYPE html>
<html>
<head>
<metacharset="UTF-8">
<title></title>
<script>
var shenArr = new Array(5);
shenArr["广东"] = ["广州","深圳","韶关","汕头","茂名"];
shenArr["湖南"] = ["长沙","张家界","株洲","岳阳","吉首"];
shenArr["湖北"] = ["武汉","宜昌","荆州","黄冈","仙桃"];
shenArr["安徽"] = ["合肥","黄山"];
shenArr["河南"] = ["郑州","开封","洛阳","信阳"];
function getShen(){
var s = document.getElementById("shen");
for(var v in shenArr){
//把数组键加入到省的下拉框
s.add(new Option(v,v),null);
}
}
function getCity(){
var s = document.getElementById("shen");
var c = document.getElementById("city");
var v = s.value;//省份的名称，也是数组中的键
c.options.length = 0;//把城市下拉框中的项清除
//循环把某一个省的城市加入到市的下拉框
for(var i in shenArr[v] ){
c.add(new Option(shenArr[v][i],shenArr[v][i]),null);
}
}
</script>
</head>
<bodyonload="getShen()">
省:<selectid="shen"onchange="getCity()">
<optionvalue="0">--请选择--</option>
</select>
市:<selectid="city"></select>
</body>
</html>Real-time acquisition of the input input box content
vue implements the click-to-image magnification function (with code)
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