JSON in JavaScript

Note: you only need to introduce the corresponding javascript on the front-end page to test the function.
Js Code
<Script type = "text/javascript" src ="Http://www.phpchina.com/scripts/json/json2.js> </script>
<Script type = "text/javascript" src = "scripts/json/jsonmessage. js"> </script>
1. Create an object using JSON in javascript
Js Code
// Create an empty object
Var JSONObject = {}

// Create a new object
Var JSONObject = new Object ()

// Create an object that contains attributes. The name is a string and the age is an integer.
Var JSONObject = {
"Name": "kevin ",
"Age": 23
}
Similar to java, we can use the dot (.) operator to obtain the attributes of an object.
Js Code
Var JSONObject = {
"Name": "kevin ",
"Age": 24,
};

Alert ("JSONObject. name:" + JSONObject. name );
Alert ("JSONObject. age:" + JSONObject. age );
2. Create an array object using JSON in javascript
Create a Student object that contains two array objects, each of which contains the attributes of the Student object.
Js Code
Var student = {
// The first array object Class
"Class ":[
{
"Name": "kevin ",
"ClassName": "java ",
"Age": 23
},
{
"Name": "yang ",
"ClassName": "java ",
"Age": 24
}
],
// The second array object
"Score ":[
{
"Name": "shower ",
"Score": 100
},
{
"Name": "zheng ",
"Score": 100
}
]
}

Var I = 0;

For (I = 0; I <student. Class. length; I ++ ){
Alert ("student. Class [" + I + "]. name =>" + student. Class [I]. name );
Alert ("student. Class [" + I + "]. className =>" + student. Class [I]. className );
Alert ("student. Class [" + I + "]. age =>" + student. Class [I]. age );
}

For (I = 0; I <student. Score. length; I ++ ){
Alert ("student. Score [" + I + "]. name =>" + student. Score [I]. name );
Alert ("student. Score [" + I + "]. score =>" + student. Score [I]. score );
}
3. Create a message in javascript using JSON
Js Code
// Create a Student Object
Var Student = {
"Math ":[{
"Name": "kevin ",
"Mark": 70,
"Age": 23
},{
"Name": "smart ",
"Mark": 40,
"Age": 25
}
],
"Science ":[{
"Name": "kevin2 ",
"Mark": 70,
"Age": 23
},{
"Name": "smart2 ",
"Mark": 40,
"Age": 25
}
]
}

// Print array value
Var I = 0;
Var array = new Array ();

For (I = 0; I <Student. Math. length; I ++ ){
Array. push (Student. Math [I]. name );
Array. push (Student. Math [I]. mark );
Array. push (Student. Math [I]. age );
}

For (I = 0; I <Student. Science. length; I ++ ){
Array. push (Student. Science [I]. name );
Array. push (Student. Science [I]. mark );
Array. push (Student. Science [I]. age );
}
Alert ("array =>" + array );

// This method produce a JSON text from a JavaScript value.
// This method converts a JavaScript value into a JSON string
Alert ("array. toJSONString () =>" + array. toJSONString ());
Alert ("String. parseJSON =>" + array. toJSONString (). parseJSON ());
Var data2 = array. toJSONString (). parseJSON ();
If (data2 instanceof Array ){
Alert ("Array ");
}