<script text/javasctipt>
 var studentObj={
    "sno":"110","sname":"张三","sex":"男"
};

//访间JSON对象的属性
alert(studentObj.sno+","+studentObj.sname +","+ studentObj.sex)
   </script>

<script type="text/javascript">
// JSON数组
var students =[
      {"sno":"110","sname":"张三","sex":"男"},
      {"sno":"120","sname":"李四","sex":"男"},
      {"sno":"130", "sname":"王五","sex":"男"}
];
// 遍历
for(var i = 0; i<students.length; i++){
var stuObj =students[i];
alert(stuObj.sno+","+stuObj.sname+","+ stuObj.sex);
}
</script>

  <script type="text/javascript">
    var user ={
        "usercode":110,"username":"王五",
        "sex":["男","女"],
        "address":{
              "city":"北京",
              "street":"大兴区",
              "zipcode":"12212121",
              "aihao" : ["smoke","drink","tt"]
         }
   }
      // 访问人名以及居住的城市
      alert(user.username+user.sex[0]+",居住在"+user.address.city+",喜欢"+user.address.aihao[0]);
      </script>

window.eval("var i=100:"); alert("i="+i);//i=100

  <script type="text/javascript">
    //这是java程序给发过来的ison格式的"字符串”//将以上的json格式的字符串转换成json对象 
    var fromJava="{\"name\":\"zhangsan!\",\"password\":\"123456\"}";
    window.eval("var jsonObj="+fromJava);//相当于用jsonObj创建了对象
    // 访问json对象
    alert(jsonObj.name +","+jsonObj.password);// 在前端取数据。
    </script>

  <script type="text/javascript">
    var data={
        "total" :4,
        "emps" :[
            {"empno" :110,"ename":"SMiTH","sal": 100},
            {"empno" :120,"ename":"SMiTH","sal": 100},
            {"empno" :130,"ename":"SMiTH","sal": 100},
            {"empno" :140,"ename":"SMiTH","sal": 100}
       ]
    };
    
    window.onload = function(){
        var displayBtnElt =document.getElementById("displayBtn"); 
           displayBtnElt.onclick =function(){
           var emps = data.emps; 
           var html ="";
            for(var i = 0; i<emps.length; i++){
             var emp = emps[i];
              html += "<tr>";
              html +="<td>"+emp.empno+"</td>";
              html +="<td>"+emp.ename+"</td>";
              html +="<td>"+emp.sal+"</td>"; 
              html += "</tr>";
            }
         document.getElementById("emptbody").innerHTML=html;
       document.getElementById("count").innerHTML=data.total;
        }
    }
    </script>
    <input type="button" value="显示员工信息列表" id="displayBtn"/>
    <h2>员工信息列表</h2>
    <hr>
    <table border="1px" width="50%">
     <tr>
         <th>员工编号</th>
        <th>员工名字</th>
        <th>员工薪资</th>
     </tr>
    <tbody id="emptboy">
    </tbody>
    </table>
    总共<span id="count"></span>