Four ways to collect JSON parsing share _javascript skills

JSON is very useful for web development, and as a carrier of data delivery, how to parse the data returned by JSON is very common. Here are the next four ways to parse JSON:

Part 1

Copy Code code as follows:

var list1 = [1,3,4];
Alert (list1[1]);
var list2 = [{"Name": "Leamiko", "Xing": "Lin"}];
Alert (list2[0]["Xing"])
Alert (list2[0].xing)

Part 2

Copy Code code as follows:

var value = {
"A": {
"Hangzhou": {"Item": "1"},
"Shanghai": {"Item": "2"},
"Chengdu": {"Item": "3"}
},
"America": {
"AA": {"Item": "1"},
"BB": {"Item": "2"}
},
"Spain": {
"DD": {"Item": "1"},
"ee": {"Item": "2"},
' ff ': {' item ': ' 3 '}
}
};
for (var countryobj in value)
{
document.write (Countryobj + ": <br/>")
Useless for (Var cityobj in value.countryobj)
for (Var cityobj in value[countryobj])
{
document.write (' + cityobj + <br/> ');
for (Var itemobj in value[countryobj][cityobj])
{
document.write ("" + Itemobj + value[countryobj][cityobj][itemobj] + "<br/>")
}
}
}

Explain:

Countryobj is an attribute of the value object, Value[countryobj] is the property value of the value object for a JSON object such as B,value[countryobj][cityobj] for josn object B It is also a JSON object, so value[countryobj][cityobj]["item" can take the value of a JSON object to temporarily become C, or Value[countryobj][cityobj].item.

It is critical to distinguish between JSON and array.

Part 3

Copy Code code as follows:

var value2 = {

"A": [
{"Name": "Hangzhou", "Item": "1"},
{"Name": "Shanghai", "Item": "2"},
{' name ': ' Sichuan ', ' Item ': ' 3 '}
],
"America": [
{"name": "AA", "Item": "12"},
{"name": "BB", "Item": "2"}
],
"Spain": [
{"Name": "CC", "Item": "1"},
{' name ': ' DD ', ' Item ': ' 23 '},
{' name ': ' EE ', ' Item ': ' 3 '}
]
};

for (Var countryobj in value2)
{
document.write (Countryobj + ": <br/>")
for (Var cityobj in value2[countryobj])
{
can be used document.write ("" + Value2[countryobj][cityobj].item + "<br/>");
document.write (Cityobj + "" + value2[countryobj][cityobj]["name"] + "<br/>");
}
}

Explain:

Countryobj is the property name of the Value2 object, Value2[countryobj] is the Value2 object property value in this case it is an array, cityobj is an element of the array, and it is another JSON object, so value2[ countryobj][cityobj]["Name" accesses the property value of the object's name, or it can be accessed by Value2[countryobj][cityobj].name.

Part 4

Copy Code code as follows:

var value2 = {
"A": [
{"Name": "Hangzhou", "Item": "1"},
{"Name": "Shanghai", "Item": "2"},
{' name ': ' Sichuan ', ' Item ': ' 3 '}
],
"America": [
{"name": "AA", "Item": "12"},
{"name": "BB", "Item": "2"}
],
"Spain": [
{"Name": "CC", "Item": "1"},
{' name ': ' DD ', ' Item ': ' 23 '},
{' name ': ' EE ', ' Item ': ' 3 '}
]
};

for (Var countryobj in value2)
{
document.write (Countryobj + ": <br/>")
document.write ("" + value2[countryobj].length);
for (var i = 0;i < value2[countryobj].length; i++)
{
document.write ("" + value2[countryobj][i]["name"] + "<br/>");
}
}

Explain:

Countryobj value2 object's property name, Value2[countryobj] property value in this case is an array, value2[countryobj].length the length of the array, Value2[countryobj][i] The item of the array = = JSON object.

value2[countryobj][i]["Name" gets the value of name, or you can use Value2[countryobj][i].name to get the value of name.