JSON Learning JSON in JavaScript detailed instructions_json

Copy code The code is as follows:

1. Create an object using JSON in javascript
Js code

Copy code The code is as follows:

//Create an empty object
var JSONObject = {}
//Create a new object
var JSONObject = new Object()
/ /Create an object containing properties, where the name is a string and the age is an integer
var JSONObject = {
"name":"kevin",
"age":23
}

Similar to java, we can get the properties of an object through the dot (.) operator.

Copy code The code is as follows:

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.

Copy code The code is as follows:

var student = {
// The first array object Class
"Class":[
"{
"name":"kevin",
"className":"java",
"age":23
                                                                                 
],
/ /The second array object
"Score":[
" {
" name": "shower",
"score":100
},
{
" name":"zheng",
"score":100
" " }
" " ]
}

var i=0;

for(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

Copy code

The code is as follows:

//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");
}

复制代码 代码如下:

//表达式有浏览器兼容问题
//var cx = /[u0000u00adu0600-u0604u070fu17b4u17b5u200c-u200fu2028-u202fu2060-u206fufeffufff0-uffff]/g,
// escapable = /[\"x00-x1fx7f-x9fu00adu0600-u0604u070fu17b4u17b5u200c-u200fu2028-u202fu2060-u206fufeffufff0-uffff]/g,
//这个是修正后的
var cx = new RegExp('/[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g'),
escapable = new RegExp('/[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g'),