<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>