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A preliminary understanding of JSON

jackloveOriginal: 2018-05-08 09:27:501460browse

JSON plays an important role in JavaScript, and this article will explain it in detail.

<html>
<body>
<h2>在 JavaScript 中创建 JSON 对象</h2>
<p>
Name: <span id="jname"></span><br />
Age: <span id="jage"></span><br />
Address: <span id="jstreet"></span><br />
Phone: <span id="jphone"></span><br />
</p>
<script type="text/javascript">var JSONObject= {
"name":"Bill Gates",
"street":"Fifth Avenue New York 666",
"age":56,
"phone":"555 1234567"};document.getElementById("jname").innerHTML=JSONObject.namedocument.getElementById("jage").innerHTML=JSONObject.agedocument.getElementById("jstreet").innerHTML=JSONObject.streetdocument.getElementById("jphone").innerHTML=JSONObject.phone</script>
</body>
</html>

Like XML

JSON is plain text

JSON is "self-descriptive" (human readable)

JSON has a hierarchical structure (in values Value exists)

JSON can be parsed through JavaScript

JSON data can be transmitted using AJAX

Differences compared to XML

No end tag

Shorter

Read and write faster

Can use the built-in JavaScript eval() method for parsing

Use arrays

Not usedReserved words

Why use JSON?

JSON is faster and easier to use than XML for AJAX applications:

Using XML

Reading XML documents

Using XML DOM for looping Traverse the document

Read values and store in variables

Use JSON

Read JSON String

Use eval( ) Processing JSON string

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