ajax请求学习之<XMLHttpRequestJSON> ->以json格式传输数据

以json格式传输数据
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Demo</title>
<style>
body, input, select, button, h1 {
    font-size: 28px;
    line-height:1.7;
}
</style>
</head>

<body>

<h1>员工查询</h1>

<label>请输入员工编号：</label>
<input type="text" id="keyword" />
<button id="search">查询</button>
<p id="searchResult"></p>

<h1>员工新建</h1>
<label>请输入员工姓名：</label>
<input type="text" id="staffName" /><br>
<label>请输入员工编号：</label>
<input type="text" id="staffNumber" /><br>
<label>请选择员工性别：</label>
<select id="staffSex">
<option>女</option>
<option>男</option>
</select><br>
<label>请输入员工职位：</label>
<input type="text" id="staffJob" /><br>
<button id="save">保存</button>
<p id="createResult"></p>

<script>
document.getElementById("search").onclick = function() {
    var request = new XMLHttpRequest();
    request.open("GET", "serverjson.php?number=" + document.getElementById("keyword").value);
    request.send();
    request.onreadystatechange = function() {
        if (request.readyState===4) {
            if (request.status===200) {
                var data = JSON.parse(request.responseText);
                if (data.success) {
                    document.getElementById("searchResult").innerHTML = data.msg;
                } else {
                    document.getElementById("searchResult").innerHTML = "出现错误：" + data.msg;
                }
            } else {
                alert("发生错误：" + request.status);
            }
        }
    }
}

document.getElementById("save").onclick = function() {
    var request = new XMLHttpRequest();
    request.open("POST", "serverjson.php");
    var data = "name=" + document.getElementById("staffName").value
                      + "&number=" + document.getElementById("staffNumber").value
                      + "&sex=" + document.getElementById("staffSex").value
                      + "&job=" + document.getElementById("staffJob").value;
    request.setRequestHeader("Content-type","application/x-www-form-urlencoded");
    request.send(data);
    request.onreadystatechange = function() {
        if (request.readyState===4) {
            if (request.status===200) {
                var data = JSON.parse(request.responseText);
                if (data.success) {
                    document.getElementById("createResult").innerHTML = data.msg;
                } else {
                    document.getElementById("createResult").innerHTML = "出现错误：" + data.msg;
                }
            } else {
                alert("发生错误：" + request.status);
            }
        }
    }
}
</script>
</body>
</html>