JSON的遍历方式

最新推荐文章于 2025-05-17 14:20:52 发布

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#json #function #javascript #object #email #null

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本文介绍三种使用JavaScript遍历JSON对象的方法：for循环、关键字in及jQuery.each()函数，并通过具体示例展示如何处理嵌套数据结构。

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第一种：使用for循环

js代码：

[javascript] view plain copy print ?

function CyclingJson1() {
var testJson = '[{ "name": "小强", "age": 16 },{"name":"小明","age":17}]';
testJson = eval("(" + testJson + ")");
for (var i = 0; i < testJson.length; i++) {
alert(testJson[i].name);
}
}

第二种：使用关键字in

js代码：

[c-sharp] view plain copy print ?

function CyclingJson2() {
var testJson = '[{ "name": "小强", "age": 16 },{"name":"小明","age":17}]';
testJson = eval("(" + testJson + ")");
for (var i in testJson) {
alert(testJson[i].name);
}
}

第三种；使用jquery.each()函数

[javascript] view plain copy print ?

function CyclingJson3() {
var testJson = '[{ "name": "小强", "age": 16 },{"name":"小明","age":17}]';
testJson = eval("(" + testJson + ")");
$.each(testJson, function (i, n) {
alert(i); //i为索引值
alert(n.name); //n为遍历的值
});
}

综合实例：

<script language="javascript" type="text/javascript">
        var array = { "a": "abc", "b": [1, 2, 3, 4, 5, 6], "c": 3, "d": { "name": "james", "age": 28},"e":null,"f":true };
        var arrayObj = { "a": { "name": "kobe", "age": 34 }, "b": { "name": "lofo", "age": 28} };

        //遍历array方式1

        for (var x in array) {
            if (typeof array[x] == 'object' && array[x] != null ) {

                for (var y in array[x]) {
                    alert("key = " + y + "  value = " + array[x][y]);
                }

            } else {
                alert("key = " + x + "  value = " + array[x]); // 非array object
            }
        }

        //遍历array方式2

        $.each(array, function(k, v) {
            var a = typeof (v);
            //数组与对象为object类型，其他分别是string与number类型
            //此时的k代表a、b、c、d，v代表对应的值
            if (typeof (v) == "object") {
                //获取数组与对象后，再去遍历这个数组与对象
                $.each(v, function(k1, v1) {
                    window.alert("key = " + k1 + " value=" + v1);
                });
            } else {
                window.alert("key = " + k + " value=" + v);
            }
        });


        //遍历arrayObj方式1

        for (var x in arrayObj) {
            for (var key in arrayObj[x]) {
                window.alert("key=" + key + " value=" + arrayObj[x][key]);
            }
        }

        //遍历arrayObj方式2

        $.each(arrayObj, function(key, value) {
            $.each(value, function(k, v) {
                window.alert("key=" + k + " value=" + v);
            });
        });

        //遍历arrayObj方式3
        $.each(arrayObj, function(key, value) {
            window.alert("key=" + key + " valueName=" + value.name + " valueAge=" + value.age);
        });
    </script>

<script language="javascript" type="text/javascript">
        var UserList = [
           { "UserID": 11, "Name": { "FirstName": "Truly", "LastName": "Zhu" }, "Email": "" },
           { "UserID": 12, "Name": { "FirstName": "Jeffrey", "LastName": "Richter" }, "Email": "" },
           { "UserID": 13, "Name": { "FirstName": "Scott", "LastName": "Gu" }, "Email": "" }
        ]
        $.each(UserList, function(k, v) {
            $.each(v, function(k1, v1) {
                if (typeof (v1) == "object") {
                    $.each(v1, function(k2, v2) {
                        window.alert("key=" + k2 + " value=" + v2);
                    });
                } else {
                    window.alert("key=" + k1 + " value=" + v1);
                }
            });
        });
    </script>

<script language="javascript" type="text/javascript">
        var userArray = [
           { "UserID": 11, "Name": { "FirstName": "Truly", "LastName": "Zhu" }, "Email": "" },
           { "UserID": 12, "Name": { "FirstName": "Jeffrey", "LastName": "Richter" }, "Email": "" },
           { "UserID": 13, "Name": { "FirstName": "Scott", "LastName": "Gu" }, "Email": "" }
        ];

        for (var i in userArray) {
            for (var k in userArray[i]) {
                if (typeof userArray[i][k] == "object" && userArray[i][k] != null) {
                    for (var j in userArray[i][k]) {
                        window.alert("key=" + j + "--value=" + userArray[i][k][j]);
                    }
                } else {
                    window.alert("key=" + k + "--value=" + userArray[i][k]);
                }
            }
        }
    </script>