第一种：使用for循环

js代码：

第二种：使用关键字in

js代码：

第三种；使用jquery.each()函数

综合实例：

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);
});


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);
 }
 });
});

希望本文所述对大家JavaScript程序设计有所帮助。