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Review XML and JSON

2022-06-11 06:02:00 【Not bald】

review XML And JSON

1.XML
- 2.JSON

1.XML

XML No HTML substitute , Different design directions ,XML Designed to store and transmit data
XML Is an extensible markup language , The labels used must be customized , But have a root tag
And all XML All elements must have closing tags
for example

<note>
<to>George</to>
<from>John</from>
<heading>Reminder</heading>
<body>Don't forget the meeting!</body>
</note>

Medium note. In addition, when customizing labels , Labels cannot start with numbers and xml, The name cannot contain spaces .XML All elements can have text content and attributes , Attribute values should be placed in " " in ,XML Tags are case sensitive , Open and close tags must be written in the same case . stay XML in , Spaces will be reserved ,XML Nothing special . It's just plain text . Software with the ability to handle plain text can handle XML.
XML Special symbols in must use entity characters
for example
Insert picture description here
XML The comments in 

2.JSON

JSON And XML Similarity is used to store and transmit information , however JSON Than XML A smaller 、 Faster number of degrees 、 Easier to parse 、 No end tag 、 shorter 、 Faster reading and writing 、 Be able to use built-in JavaScript eval() Method 、 Using arrays 、 Do not use reserved words, etc
json Has the following characteristics ：
The data is in the name / Value alignment “name” : “yyds”
Data is separated by commas [
{ key1 : value1-1 , key2:value1-2 },
{ key1 : value2-1 , key2:value2-2 },
{ key1 : value3-1 , key2:value3-2 },
…
{ key1 : valueN-1 , key2:valueN-2 },
]
Curly braces {} Save the object { “age”:18 }
brackets [] Save array , An array can contain multiple objects [
{ key1 : value1-1 , key2:value1-2 },
{ key1 : value2-1 , key2:value2-2 },
{ key1 : value3-1 , key2:value3-2 },
…
{ key1 : valueN-1 , key2:valueN-2 },
]