Initial learning and understanding of json2.js
1.) The download address of the js is: http://www.json.org/json2.js
2.) Quote the script on the page:
3.) Example Demonstration 1:
//Declare the json data structure directly
var myJSONObject = {"bindings": [
{"ircEvent": "PRIVMSG ", "method": "newURI", "regex": "^http://.*"},
{"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": " ^delete.*"},
{"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"}
]
};
In this example, an object is created that contains only one member "bindings". "bindings" is an array containing 3 objects, and each object has 3 members: "ircEvent", "method" and "regex".
These members can be obtained using "." or subscript operations.
For example: myJSONObject.bindings[0].method // "newURI"
myJSONObject.bindings[1].deleteURI // "newURI"
//Declaration string, you can compare the json text with ours The difference between normal text
var normalstring='[{persons:[{name:"jordan",sex:"m",age:"40"}, {name:"bryant",sex:"m",age :"28"}, {name:"McGrady",sex:"m",age:"27"} ]}]';
var jsontext='[{"persons":[{"name":" jordan","sex":"m","age":"40"}, {"name":"bryant","sex":"m","age":"28"}, {"name" :"McGrady","sex":"m","age":"27"} ]}]';
We can use the eval() function to call the JavaScript compiler to convert JSON text into an object. Because JSON is an exact subset of JavaScript, the compiler can correctly parse the JSON text and then generate an object structure.
//Call the eval function to convert to a json object,
var myE = eval(normalstring);
//Convert the json object to a string
var text = JSON.stringify(myE);
//Compare the difference between the converted json text and the declared text
document.writeln('Converted json text:' text '
Declared json format text' jsontext '
Declared normal format text 'normalstring '
');
The result is as follows:
Converted json text: [{"persons":[{"name ":"jordan","sex":"m","age":"40"},{"name":"bryant","sex":"m","age":"28"},{ "name":"McGrady","sex":"m","age":"27"}]}]
Declared json format text [{"persons":[{"name":"jordan" ,"sex":"m","age":"40"},{"name":"bryant","sex":"m","age":"28"},{"name":" McGrady","sex":"m","age":"27"}]}]
The plain text of the declaration [{persons:[{name:"jordan",sex:"m",age: "40"}, {name:"bryant",sex:"m",age:"28"}, {name:"McGrady",sex:"m",age:"27"} ]}]
Summary: The converted json text and the declared json format text content are the same.
//When security is more important, it is better to use JSON parsing. JSON parsing will only recognize JSON text and it is more secure. The parse function of json is called below to convert the text data to generate a json data structure
var myData = JSON.parse(jsontext);
The complete file is as follows (difference: myJSONObject , jsontext, normalstring):
<script> <BR>var normalstring='[{persons:[{name:"jordan",sex:"m",age:"40"}, {name:"bryant",sex:"m ",age:"28"}, {name:"McGrady",sex:"m",age:"27"} ]}]'; <BR>var jsontext='[{"persons":[{"name ":"jordan","sex":"m","age":"40"}, {"name":"bryant","sex":"m","age":"28"}, { "name":"McGrady","sex":"m","age":"27"} ]}]'; <BR>var myJSONObject = {"bindings": [ <BR>{"ircEvent": " PRIVMSG", "method": "newURI", "regex": "^http://.*"}, <BR>{"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"}, <BR>{"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"} <BR>] <BR>}; <BR>//Call the eval function to convert to a json object, <BR>var myE = eval(normalstring); <BR>//Convert the json object to a string <BR>var text = JSON.stringify(myE); <BR> //Compare the difference between the converted json text and the declared text<BR>document.writeln('Converted json text:' text '<br><br>Declared json format text' jsontext '<br> <br>Declared normal string 'normalstring '<br><br>'); <BR>//JSON parsing<BR>var myData = JSON.parse(jsontext); <BR></script>> ;
4.) Example demonstration two:
// The following is the operation of adding, deleting, checking and modifying json objects
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