json获取元素数量

 1 var keleyijson={"plug1":"myslider","plug2":"zonemenu"}
 2 
 3 function JSONLength(obj) {
 4 var size = 0, key;
 5 for (key in obj) {
 6 if (obj.hasOwnProperty(key)) size++;
 7 }
 8 return size;
 9 };
10 document.write("json对象的元素个数是："+JSONLength(keleyijson));//结果为2

在获取一组json，看其返回结果

 1 var keleyijson={
 2 
 3 "model": [
 4 { "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" },
 5 
 6 { "firstName": "Jason", "lastName":"Hunter", "email": "bbbb" }
 7 ],
 8 
 9 "girl": [
10 { "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" },
11 
12 { "firstName": "Jason", "lastName":"Hunter", "email": "bbbb" }
13 ],
14 
15 "zachary": [
16 { "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" },
17 
18 { "firstName": "Jason", "lastName":"Hunter", "email": "bbbb" }
19 ],
20 
21 "lite": [
22 { "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" },
23 
24 { "firstName": "Jason", "lastName":"Hunter", "email": "bbbb" }
25 ]
26 
27 }
28 
29 function JSONLength(obj) {
30 var size = 0, key;
31 for (key in obj) {
32 if (obj.hasOwnProperty(key)) size++;
33 }
34 return size;
35 };
36 document.write("json对象的元素个数是："+JSONLength(keleyijson));