在Javascript操作JSON对象，增加 删除 修改

<script type="text/javascript">    var jsonObj2 = { teacher: [        { name: "jordan", sex: "m", age: "40" },        { name: "bryant", sex: "m", age: "28" },        { name: "McGrady", sex: "m", age: "27" }    ]};    var jsonObj2New = {};    $("#btn").click(function () {        //invoke the update        updateData("jordan");        var persons = jsonObj2.teacher;        for (var i = 0; i < persons.length; i++) {            var cur_person = persons[i];            alert(cur_person.sex);        }        //invoke the delete        deleteData("jordan");        var persons = jsonObj2.teacher;        for (var i = 0; i < persons.length; i++) {            var cur_person = persons[i];            alert(cur_person.sex);        }        //push         var temp = { name: "kenny", sex: "m", age: "25" };        jsonObj2.teacher.push(temp);        var persons = jsonObj2.teacher;        for (var i = 0; i < persons.length; i++) {            var cur_person = persons[i];            alert(cur_person.name);        }    });    function updateData(name) {        var persons = jsonObj2.teacher;        //alert(name);        for (var i = 0; i < persons.length; i++) {            var cur_person = persons[i];            if (cur_person.name == name) {                persons[i].sex = "f";            }        }    }    function deleteData(name) {        var persons = jsonObj2.teacher;        //alert(name);        for (var i = 0; i < persons.length; i++) {            var cur_person = persons[i];            if (cur_person.name == name) {                jsonObj2.teacher.splice(i, 1);            }        }    }    </script>