Property access in JSON format-dot or bracket

1. JSON format-access JSON property names, property values

<script> attr format-dot or bracket-NOTE: the variable var imgdata={"name" can be placed inside the brackets: " Picture description and picture relative path "," title ":" Logo image "," url ":" Logo.png "};  alert (imgdata.name);   Alert (imgdata["name"]);  var str= "name";     Alert (Imgdata[str]); var json1={"name": "Here is a set of pictures of the text description and picture relative path", "title": ["logo image", "Picture 1", "Picture 2", "Picture 3"], "url": ["Logo.png", "1.png", "2.P Ng "," 3.png "]};alert (json1.name), alert (Json1.url), alert (json1.url[1]), alert (json1[" name "]), alert (JSON 1["url"]), alert (json1["url"][1]), var json2 ={"name": "Picture description and picture relative path", "Imgdata": [{"Name": "Picture 1", "title": "Logo picture 1 "," url ":" Logo1.png "}, {" Name ":" Picture 2 "," title ":" Logo picture 2 "," url ":" Logo2.png "}, {" Name ":" Picture 3 "," title ":" Logo image 3 "," url ":" Logo3.png "}]}; alert (json2.name);  alert (json2.imgdata);      alert (json2.imgdata[0].name); Alert (json2["name"]);  Alert (json2["Imgdata"]);      Alert (json2["Imgdata"][0].name); </script> 

2.for-in accessing JSON property names, property values

<script>         var json1= {         "name": "July",          "age": 2.png,          "imgsrc": ["1.png", "", "3.png"]         };  /* For-in Access Property name: Name Age    imgsrc*/for         (var attr in json1) {         console.log (attr);            }      /* For-in Access attribute value           :           July           ["1.png", "2.png", "3.png"]            *                /for (Var attr in json1) {         Console.log (json1[attr]);                } </script>

3.for-in the property name of the Access object, the property value

  For-in the property name of the Access object, the property value for the         (var attr in window) {             console.log (   attr);           }         for (var attr in window) {             console.log (  window[attr]);          }

　　

  For-in the property name of the Access object, the property value for the         (var attr in document) {             console.log (   attr);          }         for (var attr in document) {             console.log (  document[attr]);          }

　　

Property access in JSON format-dot or bracket