json--Eon Gray JS notes

//simple values for JSON10NULLtrue"FC"//object representsvarbox ={name:' FC ', Age:25};//The JSON object represents{    "Name": "FC",    "Age": "25"}' {' name ': ' FC ', ' Age ': ' 25 '} '//Ps:json is plainly a string, so any representation should be quoted as a string. //Normal Arrayvarbox = [+, ' FC ',true];//JSON Array' [+, ' FC ', True] '//Ps:json objects and arrays are smaller than normal objects and arrays, with fewer semicolons, less variable assignments, and themselves as string representations. //The most commonly used JSON structure[    {        "Name": "FC",        "Age": 25    },    {        "Name": "LQ",        "Age": 25    },    {        "Name": "Hehe",        "Age": 25    }]//simulates the process of loading a JSON data string, var json = load (' Demo.json ');//load the JSON string in and assign it to the JSON variable. varJSON = [{"title": "A", "num": 1},{"title": "B", "num": 2}];varJson1 = ' [{' title ': ' A ', ' num ': 1},{' title ': ' B ', ' num ': 2}] '; Console.log (JSON); //[Object, Object]Console.log (Json1);//[{"title": "A", "num": 1},{"title": "B", "num": 2}]Console.log (typeofJson1);//string//parsing and serialization//if it is a loaded JSON file that we need to use, then we must parse the JSON string into native JavaScript values. Of course, if it is a native JavaScript object or array, it can also be converted to a JSON string. //The eval () function was used earlier for parsing a JSON string into a JavaScript native value. However, this approach is not secure and may execute some malicious code. varJSON = ' [{' title ': ' A ', ' num ': 1},{' title ': ' B ', ' num ': 2}] ';varbox =eval (JSON); Console.log (box); //[Object, Object]Console.log (Box[1].title);//bvarbox =[{title:A, Num:1, Height:122}, {title:' B ', Num:2, Height:133    }]varJSON =json.stringify (box); Console.log (JSON); //[{"title": "A", "num": 1, "height": 122},{"title": "B", "num": 2, "height": 133}]varbox =[{title:A, Num:1, Height:122}, {title:' B ', Num:2, Height:133    }]varJSON = json.stringify (box,[' num ', ' height ']); Console.log (JSON); //[{"num": 1, "height": 122},{"num": 2, "height": 133}]varbox =[{title:A, Num:1, Height:122}, {title:' B ', Num:2, Height:133    }]varJSON = json.stringify (box,function(key, value) {if(key = = ' title '){        return' Mr. ' +value; } Else {        returnvalue;  }}); Console.log (JSON); //[{"title": "MR.A", "num": 1, "height": 122},{"title": "Mr.b", "num": 2, "height": 133}]//PS: Firefox 3.5 and 3.6 when initially supporting JSON stringify method has a small bug, the execution of funxtion error. varbox =[{title:A, Num:1, Height:122}, {title:' B ', Num:2, Height:133    }]varJSON = json.stringify (box,[' title ', ' Num '), 4);varJson2 = json.stringify (box,[' title ', ' num '), '--'); Console.log (JSON);// [//     {//" title": "A",//"num": 1//     },//     {//" title": "B",//"num": 2//     }// ]Console.log (json2);// [// --{//----"title": "A",//----"num": 1// --},// --{//----"title": "B",//----"num": 2// --}// ]varbox =[{title:A, Num:1, Height:122}, {title:' B ', Num:2, Height:133    }]varJSON = json.stringify (box,NULL, 4); Console.log (JSON);// [//     {//" title": "A",//"num": 1,//"height": 122//     },//     {//" title": "B",//"num": 2,//"height": 133//     }// ]varbox =[{title:A, Num:1, Height:122, ToJSON:function () {            return  This. title; }}, {title:' B ', Num:2, Height:133, ToJSON:function () {            return  This. title; }    }]varJSON =json.stringify (box); Console.log (JSON); //["A", "B"]//JSON serialization also has an execution order, first executing the Tojson () method, or if the second parameter is applied. The serialization process is then performed. For example, the key-value pairs make up a valid JSON string, such as a double quotation mark, if the indentation is provided, the indentation is performed. varJSON = ' [{' title ': ' A ', ' num ': 1},{' title ': ' B ', ' num ': 2}] ';varbox =Json.parse (JSON) Console.log (JSON);

json--Eon Gray JS notes