1. 学到的东西：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
//1.定义基本格式
var person = {"name": "张三", age: 23, 'gender': true};
//获取name的值
//var name = person.name;
var name = person["name"];
// alert(name);
//alert(person);
//2.嵌套格式 {}———> []
var persons = {
"persons": [
{"name": "张三", "age": 23, "gender": true},
{"name": "李四", "age": 24, "gender": true},
{"name": "王五", "age": 25, "gender": false}
]
};
// alert(persons);
//获取王五值
var name1 = persons.persons[2].name;
// alert(name1);
//2.嵌套格式 []———> {}
var ps = [{"name": "张三", "age": 23, "gender": true},
{"name": "李四", "age": 24, "gender": true},
{"name": "王五", "age": 25, "gender": false}];
//获取李四值
//alert(ps);
alert(ps[1].name);
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
//1.定义基本格式
var person = {"name": "张三", age: 23, 'gender': true};
var ps = [{"name": "张三", "age": 23, "gender": true},
{"name": "李四", "age": 24, "gender": true},
{"name": "王五", "age": 25, "gender": false}];
//获取person对象中所有的键和值
//for in 循环
/* for(var key in person){
//这样的方式获取不行。因为相当于 person."name"
//alert(key + ":" + person.key);
alert(key+":"+person[key]);
}*/
//获取ps中的所有值
for (var i = 0; i < ps.length; i++) {
var p = ps[i];
for(var key in p){
alert(key+":"+p[key]);
}
}
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>注册页面</title>
<script src="js/jquery-3.3.1.min.js"></script>
<script>
//在页面加载完成后
$(function () {
//给username绑定blur事件
$("#username").blur(function () {
//获取username文本输入框的值
var username = $(this).val();
//发送ajax请求
//期望服务器响应回的数据格式：{"userExsit":true,"msg":"此用户名太受欢迎,请更换一个"}
// {"userExsit":false,"msg":"用户名可用"}
$.get("findUserServlet",{username:username},function (data) {
//判断userExsit键的值是否是true
// alert(data);
var span = $("#s_username");
if(data.userExsit){
//用户名存在
span.css("color","red");
span.html(data.msg);
}else{
//用户名不存在
span.css("color","green");
span.html(data.msg);
}
});
});
});
</script>
</head>
<body>
<form>
<input type="text" id="username" name="username" placeholder="请输入用户名">
<span id="s_username"></span>
<br>
<input type="password" name="password" placeholder="请输入密码"><br>
<input type="submit" value="注册"><br>
</form>
</body>
</html>
2. 遇到的问题:JSON的使用
3. 明日计划:继续学习JavaWeb技术