①

JSON数据如下，是一个嵌套JSON：

{"comments":[{"content":"很不错嘛","id":1,"nickname":"纳尼"},{"content":"哟西哟西","id":2,"nickname":"小强"}]}

function loadInfo() {
    $.getJSON("loadInfo", function(data) {
        $("#info").html("");//清空info内容
        $.each(data.comments, function(i, item) {
            $("#info").append(
                    "

" + 
                    "" +
                    "

---

");
        });
        });
}

loadinfo是请求的地址，function(data){...}就是在请求成功后的回调函数，data封装了返回的JSON对象，在下面的$.each(data.comments,function(i,item){...})方法中data.comments直接到达JSON数据内包含的JSON数组：

[{"content":"很不错嘛","id":1,"nickname":"纳尼"},{"content":"哟西哟西","id":2,"nickname":"小强"}]

②

如果返回的JSON数据比较复杂，则只需多些$.each()进行遍历即可，嘿嘿。例如如下JSON数据：

{"comments":[{"content":"很不错嘛","id":1,"nickname":"纳尼"},{"content":"哟西哟西","id":2,"nickname":"小强"}],"content":"你是木头人，哈哈。","infomap":{"性别":"男","职业":"程序员","博客":"http://www.cnblogs.com/codeplus/"},"title":"123木头人"}

functionloadInfo() {
    $.getJSON("loadInfo", function(data) {
        $("#title").append(data.title+"

---

");
        $("#content").append(data.content+"

---

");
//jquery解析map数据
       $.each(data.infomap,function(key,value){
            $("#mapinfo").append(key+"----"+value+"

---

");
        });
//解析数组
       $.each(data.comments, function(i, item) {
            $("#info").append(
                    ""+
                    ""+
                    "

---

");
        });
        });
}

③直接解析一个json字符串

var result={"getMeters":[{"Mid":"34","Mname":"","Tid":"5416685","Tname":"5号楼","Tcldid":"11","Unicode":"152"},{"Mid":"35","Mname":"","Tid":"5416685","Tname":"5号楼","Tcldid":"12","Unicode":"152"}]}

 

    var getCode=new Array();

       var dataobj = eval("(" + result.value + ")"); //转换为json对象 
    $.each(dataobj.getMeters, function (i, item) {
         getCode.push(item.Unicode);
    });