JSON learning JSON in JavaScript detailed usage instructions _json

Copy Code code as follows:

<script type= "Text/javascript" src= "Scripts/json/json2.js" ></script>
<script type= "Text/javascript" src= "Scripts/json/jsonmessage.js" ></script>

first, use JSON to create an object in JavaScript
JS Code

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Create an empty object
var jsonobject = {}
To create a new object
var jsonobject = new Object ()
Creates an object that contains a property, with the name string and the age as an integral type
var jsonobject = {
"Name": "Kevin",
"Age": 23
}

Similar to Java, we can use the dot (.) The operator gets the properties of the object.

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var jsonobject = {
"Name": "Kevin",
"Age": 24,
};

Alert ("Jsonobject.name:" +jsonobject.name);
Alert ("Jsonobject.age:" +jsonobject.age);

Ii. Creating an Array object in JavaScript using JSON

Creates a student object containing two array objects, each containing the properties of the student object.

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var student = {
First Array Object class
"Class": [
{
"Name": "Kevin",
"ClassName": "Java",
"Age": 23
},
{
"Name": "Yang",
"ClassName": "Java",
"Age": 24
}
],
A 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);
}

using JSON to create messages in JavaScript

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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 is produce a JSON text from a JavaScript value.
This method converts a JavaScript value to 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");
}

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Expression has browser-compatible issues
var cx =/[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\ Uffff]/g,
escapable =/[\\\ "\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\ U206f\ufeff\ufff0-\uffff]/g,
This one is fixed.
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 '),