用$.isEmptyObject(对象)来判断 空返回true 否则为false
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<!-- 引入jquery.js -->
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-3.3.1.min.js"></script>
<script type="text/javascript">
$(function () {
$("#sb").click(function () {
var str = document.getElementById("su");
var st=str.value;
$.ajax({
url:"/Home/mail/find",
data:{number:st},
dataType:"json",
success:function (mobile) {
console.log($.isEmptyObject(mobile.mobileNumber));
console.log(mobile);
if(!$.isEmptyObject(mobile.mobileNumber)){//不为空
console.log(mobile);
var msg = mobile.mobileNumber+"=>"+mobile.mobileArea+"=>"+mobile.mobileType;
$("#result").html(msg);
}else{
$("#result").html("不存在");
}
}
})
})
});
</script>
</head>
<body>
<form >
<input id="su" type="text" name="number">
<input id="sb" type="button" value="查询归属地">
</form>
<div id="result"></div>
</body>
</html>