js 解析 json

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1.簡單的json格式

{"user":[{"name":"name1","age":24,"sex":"男"},{"name":"name2","age":24,"sex":"男"},{"name":"name3","age":24,"sex":"男"}]}

 2.完整的Ajax調用

<script type="text/javascript">        function GetMessageByUrl() {            $.ajax({                type: "GET",                cache: "false",                //                url: "http://192.168.1.132:890/api/vehicle/tracking",                url: "TextJson.txt",                datatype: "json",                success: function (data) {                    ///                    ///通過eval()將json格式字串轉換成json對象。                    ///                    var dataEval = eval("(" + data + ")");                    alert(dataEval.user[1].name);                    alert("節點1");                    ///                    ///通過$.parseJSON()將json格式字串轉換成json對象。                    ///                    var dataObj = jQuery.parseJSON(data);                    alert(dataObj.user[2].name);                    alert("節點2");                    ///                    ///遍曆json對象中的元素                    ///                    $.each(dataObj.user, function (idx, item) {                        alert("name:" + item.name + ",value:" + item.age);                    })                },                error: function (err_data) {                    alert(err_data);                }            })        };    </script>

 3.簡單調用

                        var txt = ‘{"employees":[‘ +            ‘{"firstName":"Bill","lastName":"Gates" },‘ +            ‘{"firstName":"George","lastName":"Bush" },‘ +            ‘{"firstName":"Thomas","lastName":"Carter" }]}‘;                        var obj = eval("(" + txt + ")");                        document.getElementById("fname").innerHTML = obj.employees[1].firstName                        document.getElementById("lname").innerHTML = obj.employees[1].lastName                        $.each(obj.employees, function (idx, item) {                            if (idx == 0) {                                return true; //同countinue，返回false同break                             }                            alert("name:" + item.firstName + ",value:" + item.lastName);                        });