One 、 Basics

（ One ） The essence ： Text

1、 Concept

Javascript grammar 
 Data objects 
 Lightweight text data interchange format 
 Independent 

2、 features

 Pure text 
 Can be read 
 Median value （ Hierarchy ）
JS analysis 
 data AJAX transmission 
 No end tag 
 short 
 fast 
 Built in method analysis 
 Array 
 No reserved words 

（ Two ） grammar ：JavaScript object

 The data is in the name / Value alignment 
 Data consists of commas , Separate 
 Curly braces  {}  Save the object 
 brackets  []  Save array , An array can contain multiple objects 

（ 3、 ... and ） name / It's worth it ：（key : value）

"name" : " The Chinese people "

1、value： value

 Numbers （ Integer or floating point number ）：{ "age":30 }

 character string （ In double quotes ）

 Boolean value （true  or  false）： Boolean value 
	{ "flag":true }
	
 Array （ In brackets ）：[]
	{ "sites": [
 	    { "name":" Novice tutorial " , "url":"www.runoob.com" }, 
     	{ "name":"google" , "url":"www.google.com" }, 
     	{ "name":" Microblogging " , "url":"www.weibo.com" }
			]
	}
	
 object （ In braces ）：{ "name":" Novice tutorial " , "url":"www.runoob.com" }

null：{ "runoob":null }

（ Four ） Format ：

 file type —— .json
MIME  The type is ——application/json

（ 5、 ... and ） Compare ：

{
    "sites": [
    { "name":" Novice tutorial " , "url":"www.runoob.com" }, 
    { "name":"google" , "url":"www.google.com" }, 
    { "name":" Microblogging " , "url":"www.weibo.com" }
    ]
}

<sites>
  <site>
    <name> Novice tutorial </name> <url>www.runoob.com</url>
  </site>
  <site>
    <name>google</name> <url>www.google.com</url>
  </site>
  <site>
    <name> Microblogging </name> <url>www.weibo.com</url>
  </site>
</sites>