<script type="text/javascript" async="true">
function Loadcity(){
var text_2=document.getElementById("city");
text_2.removeAttribute("hidden");
}
</script>
JavaScript原生添加hidden属性，也就是增加一个hidden，达到隐藏效果
<script type="text/javascript" async="true">
function Loadprovince(){
var text_1=document.getElementById("province");
text_1.setAttribute("hidden",true);
}
</script> 
