JSON遍历方式实例总结

本文实例总结了JSON遍历方式。分享给大家供大家参考，具体如下：
第一种：使用for循环
js代码：


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：


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


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>



希望本文所述对大家JavaScript程序设计有所帮助。


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