Add, delete, modify, and query an array

Add, delete, modify, and query an array

During batch data input, you need to add, delete, modify, and query arrays in json. splice is a powerful method to record the usage.

Var lang = ["php", "java", "javascript"];

// Delete
Var removed = lang. splice (2, 1 );
Console. log (lang); // php, javascript
// Console. log (removed); // java, return the deleted item
// Insert
Var insert = lang. splice (0th, "asp"); // insert data from locations
// Alert (insert); // returns an empty array
Console. log (lang); // asp, php, javascript
// Replace
Var replace = lang. splice (, "c #", "ruby"); // delete one item and insert two items
// Alert (lang); // asp, c #, ruby

Console. log (replace); // php, return the deleted item

In addition, the addition, deletion, modification, and query of multiple json files are also attached:

/**
* Json object operations: add, delete, modify, and query
*
* @ Author lellansin
* @ Blog www.lellansin.com
* @ Version 0.1
*
* Solve some common problems
* Get/set solves the problem of no node interruption when obtaining and setting.
* Create can create a multi-level node. If it exists, it overwrites the new value.
* Delete a node and Its subnodes
* Print_r format the output object (for debugging)
* For the instance, see the bottom.
*/


Function Json (){


}


/**
* Get a node in the Json object
* Example: json. get (Data, 'country', 'vince ', 'city ');
* If the result is returned, Data ['country'] ['vince '] ['city'] is returned.
* If none, false is returned.
*/
Json. prototype. get = function (obj, key ){
Var args = this. get. arguments;
Var result = obj;


For (var I = 1; I <args. length; I ++ ){
Result = result [args [I];
If (result = undefined ){
Return false;
};
};
Return result;
};


/**
* Set a node in the Json object
* Example: obj. set (data, "ENTRY", "FA_TOKEN_INVALID", 1234 );
* Set data ['entry '] ['fa _ token_invalid'] To 1234.
* Success: true; Failure: false
*/
Json. prototype. set = function (obj, key ){
Var args = this. set. arguments;
If (ergodic_set (obj, args, 1 )){
Return true;
} Else {
Return false;
}
}


/**
* Create a node in the Json object (overwrite the value if any)
* Example: obj. create (data, 'add', 'Hello', 'test', 120 );
* Add the data ['create'] ['hello'] ['test'] node and set the value to 120.
* Success: true; Failure: false
*/
Json. prototype. create = function (obj, key ){
Var args = this. create. arguments;
If (ergodic_create (obj, args, 1 )){
Return true;
} Else {
Return false;
}
}


/**
* Delete a node from a Json object
* Example: obj. delete (prods, 'grad', 'Math ');
* Success: true; Failure: false
*/
Json. prototype. delete = function (obj, key ){
Var args = this. delete. arguments;
If (ergodic_delete (obj, args, 1 )){
Return true;
} Else {
Return false;
}
}


/**
* Return the string form of the Json object (encapsulate the ECMAScript library function)
*/
Json. prototype. getStr = function (obj ){
Return JSON. stringify (obj );
}


/**
* Parse the string and return a Json object (encapsulate the ECMAScript library function)
*/
Json. prototype. getJson = function (str ){
Return JSON. parse (str );
}


/**
* Format the output Json object.
*/
Json. prototype. print_r = function (obj ){
Console. log ("{")
Ergodic_print (obj ,"");
Console. log ("}")
}


Function ergodic_print (obj, indentation ){
Var indent = "" + indentation;
If (obj. constructor = Object ){
For (var p in obj ){
If (obj [p]. constructor = Array | obj [p]. constructor = Object ){
Console. log (indent + "[" + p + "] =>" + typeof (obj) + "");
Console. log (indent + "{");
Ergodic_print (obj [p], indent );
Console. log (indent + "}");
} Else if (obj [p]. constructor = String ){
Console. log (indent + "[" + p + "] => '" + obj [p] + "'");
} Else {
Console. log (indent + "[" + p + "] =>" + obj [p] + "");
}
}
}
}


Function ergodic_set (obj, args, floor ){
If (obj. constructor = Object ){
For (var tmpKey in obj ){
If (tmpKey = args [floor]) {
If (floor <args. length-2 ){
Return ergodic_set (obj [tmpKey], args, floor + 1 );
} Else {
// At this time, the parameter floor is the second to the last, and the value of 1 is the last one.
Obj [tmpKey] = args [floor + 1];
Console. log ("set successfully, return true ");
Return true;
}
}
}
}
}


Function ergodic_create (obj, args, floor ){
If (obj. constructor = Object ){
For (var tmpKey in obj ){
If (tmpKey = args [floor]) {
If (floor <args. length-2 ){
Return ergodic_create (obj [tmpKey], args, floor + 1 );
} Else {
Obj [tmpKey] = args [floor + 1];
Return true;
}
}
}
}
// The node does not exist. Create a new node.
If (floor <args. length-1 ){
Var jsonstr = getJsonFormat (args [args. length-1]);


For (var I = args. length-2; I> floor; I --){
Jsonstr = '{"' + args [I] + '":' + jsonstr + '}';
};


// When parsing third-party Json data using eval, malicious code may be executed
// Var node = eval ('+ jsonstr + ')');
Var node = JSON. parse (jsonstr );
Obj [args [floor] = node;
Return true;
}
}


Function ergodic_delete (obj, args, floor ){
If (obj. constructor = Object ){
For (var tmpKey in obj ){
If (tmpKey = args [floor]) {
If (floor <args. length-1 ){
Return ergodic_delete (obj [tmpKey], args, floor + 1 );
} Else {
Delete obj [tmpKey];
Return true;
}
}
}
}
}




Function getJsonFormat (param ){
If (param. constructor = String ){
Return '"' + param + '"';
} Else {
Return param;
}
}






/**
* Use instances
*/


Var data = {};


Var prods = {
'Name': 'Alan ',
'Grad ':{
'China': 120,
'Math': 130,
'Computing ':{
'Noi': 'First Prize'
}
}
};
/*
Var json = new Json ();


Console. log ("Get nodes in Json ");
Console. log (json. get (data ));
Console. log (json. create (data, "0 ",""));
Console. log (json. set (data, "0", prods ));
Console. log (json. create (data, "1 ",""));
Console. log (json. set (data, "1", prods ));
Console. log (json. create (data, "2 ",""));
Console. log (json. set (data, "2", prods ));
Console. log (json. get (data ));
Json. print_r (data );*/
/*
Console. log (json. get (data, "OK"); // 200
Console. log (json. get (data, "ENTRY", "FA_TOKEN_INVALID"); // 1001
Console. log (json. get (data, "TEST", ""); // false if no node is returned, false


Console. log ("set nodes in Json ");
Console. log (json. set (data, "ENTRY", "FA_TOKEN_INVALID", 1234); // true
Console. log (json. get (data, "ENTRY", "FA_TOKEN_INVALID"); // 1234 obtain the node you just set
Console. log (json. set (data, "ENTRY", "test node not set", 1234); // false setting failed


Console. log ("Creating a New Json node ");
Var prods = {
'Name': 'Alan ',
'Grad ':{
'China': 120,
'Math': 130,
'Computing ':{
'Noi': 'First Prize'
}
}
};
Console. log (json. create (prods, 'create', 'Hello', 'test', 120); // true
Console. log (json. create (prods, 'create', 'Hello', 'test2', 'pass'); // true


Console. log ("formatting output node ");
Json. print_r (prods );


Console. log ("delete node ");
Console. log (json. delete (prods, 'grad', 'Math'); // true
Console. log (json. delete (prods, 'grad', 'computing'); // true
Console. log (json. delete (prods, 'grade ', 'delete nodes not exists'); // false
Json. print_r (prods );
*/