JSON detailed study JSON in JavaScript

Note: You only need to introduce the corresponding javascript into the front page to test the
Js code


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 containing attributes, where the name is a string and the age is Integer type
var JSONObject = {
"name":"kevin",
"age":23
}
Similar to java, we can get the properties of the object through the dot (.) operator.
Js code
var JSONObject = {
"name":"kevin",
"age":24,
};

alert("JSONObject.name:"+JSONObject.name);
alert("JSONObject.age :"+JSONObject.age);
2. Use JSON to create array objects in javascript
Create a Student object, which contains two array objects. Each array object contains the properties of the Student object.
Js code
var student = {                                                                            Class Name "age":23
},                                                                                        ],
//The second array object
"Score":[
                                   "name":"shower", "score":100                                                                           
                                                                                                                                                                                              (i=0;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 alert("student.Score["+i+"].name== =>"+student.Score[i].name);
alert("student.Score["+i+"].score===>"+student.Score[i].score);
}
3. Use JSON to create messages in javascript
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    array.push(Student.Math[i].name);   
    array.push(Student.Math[i].mark);   
    array.push(Student.Math[i].age);   
}   
  
for(i=0;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.  
//这个方法将一个JavaScript值转换为一个JSON字符串  
alert("array.toJSONString()==>"+array.toJSONString());   
alert("String.parseJSON==>"+array.toJSONString().parseJSON());   
var data2 = array.toJSONString().parseJSON();   
if(data2 instanceof Array){   
    alert("Array");   
}