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Detailed explanation of the syntax and format of Json in js

高洛峰

Dec 05, 2016 pm 04:52 PM

The JSON text format is syntactically identical to the code that creates JavaScript objects.

Due to this similarity, JavaScript programs can use the built-in eval() function to generate native JavaScript objects from JSON data without the need for a parser.

JSON syntax rules:

Data is in name/value pairs
Data is separated by commas
Cure braces save objects
Square brackets save arrays

Introduction to JSON name/value pairs

"name":"张飞",
"age":23

The value of Json can be:

Number (Integer or floating point number)
String (to be included in double quotes)
Logical value (true or false)
Array (in square brackets)
Object (in curly brackets)

The method of converting Json to javascript object is ;

　javascript object Convert to JSON

<html>
<head>
 <title>Json测试</title>
 <script src="/Scripts/jquery-1.7.2.min.js" type="text/javascript"></script>
 <script type="text/javascript">
  //基本上，Json返回的要么是对象，要么是数组，如果单纯返回一个字符串，那么就没有必要用Json了，因此
  //Json基本就下面这些可，不过要注意双引号
  var str0 = "{employees:&#39;测试&#39;}";
  var obj0 = eval("(" + str0 + ")");
  alert(obj0.employees);   //输出测试
 
  var str = "{name:&#39;张三&#39;,Age:21}";
  var obj = eval("(" + str + ")");
  document.write(obj.name + obj.Age); //输出 张三21
  alert(obj.name);
 
  //别看下面那段Json长，其实是一个对象，属性employees的值是一个对象数组。和上面的相比，只是name:张三 中的"张三"字符串 变成了对象数组而已
  var str2 = &#39;{ "employees" : [&#39; + &#39;{ "firstName":"Bill" , "lastName":"Gates" },&#39; + &#39;{ "firstName":"George" , "lastName":"Bush" },&#39; + &#39;{ "firstName":"Thomas" , "lastName":"Carter" } ]}&#39;;
  var obj2 = eval("(" + str2 + ")");
  alert(obj2.employees[0].firstName);  //弹出 Bill
 
  var str3 = "[1,2,3,4,5,6]";    //json 数组
  var obj3 = eval("(" + str3 + ")");  //输出 2
  alert(obj3[1]);
 </script>
</head>
<body>
 <div id="div1">
 </div>
</body>
</html>

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