A, json defined
JSON (JavaScript Object Notation), which is just a bunch of string elements will be marked with specific symbols.
- Bis {} brackets indicate the object
- [] Represents an array in brackets
- "" Is in quotation marks or attribute value
- : Colon which indicates the value of the former (this value may be a string, a number, or may be another array or object)
JavaScript Object Notation JSON syntax is a subset of the syntax of law.
Data in the name / value pairs separated data by commas, braces for objects, brackets backup array
JSON values may be: a number (integer or floating point), the string (in double quotes), a logical value (true or false ), array (in square brackets), the object (in braces), null
Therefore, { "name": "Michael"} may be understood as a name for the object containing the Michael
Second, why use json
- JSON is a text format that is independent of language and platform.
- To generate and parse XML in terms of relative simplicity.
- Read and write faster.
Three, JS built two Json method
1, the object into a string
Any Json into the JavaScript, this object is serialized as Json string before it can be transmitted through the network;
JSON.stringify( {} , [ ] , "")
// Parameter One: To serialized data (Object)
// two parameters: the control key object, just the output of the specified attribute, passed in an array
@ three parameters: After serialization, the printout format (a Tab, can be more intuitive view json)
example:
2, the string into an object
If we receive a JSON string format, just take it deserialized into a JavaScript object, you can use the object directly in JavaScript
JSON.parse( json.DATA )
// incoming json string
Fourth, the global replacement string
V. traverse json object and the json array
1 traversing JSON object code as follows:
packJson = {var "name": "Liza", "password": "123"};
for (var K in packJson) {// iterate each key object packJson / value pair of, k is the key
Alert (K + " "packJson + [K]);
}
2, JSON array traversal code is as follows:
var packJson = [{"name":"Liza", "password":"123"}, {"name":"Mike", "password":"456"}];
for(var i in packJson){//遍历packJson 数组时，i为索引
alert(packJson[i].name + " " + packJson[i].password);
}
This is a constant learning imitation, practice, and then to finally face his own original process.
虽然可能从来不能写出超越网上通类型同主题博文，但为什么还是要写？
于自己而言，博文主要是自己总结。假设自己有观众，毕竟讲是最好的学（见下图）。于读者而言，笔者能在这个过程get到知识点，那就是双赢了。
当然由于笔者能力有限，或许文中存在描述不正确，欢迎指正、补充！
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