Collect four methods to share json parsing_javascript skills

Json is widely used in web development. As a carrier of data transmission, how to parse the data returned by Json is very common. Here are four ways to parse Json:

Part 1

Copy code The code is 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 The code is as follows:

var value = {
"china":{
"hangzhou":{"item":"1"},
"shanghai":{"item":"2"},
"chengdu ":{"item":"3"}
},
"America":{
"aa":{"item":"1"},
"bb":{" item":"2"}                                                                                                      2"},
"ff":{"item":"3"}
}
};
for(var countryObj in value)
{
document.write( countryObj ":
")
//Useless for(var cityObj in value.countryObj)
for(var cityObj in value[countryObj])
{
document. write(' ' cityObj "
");
for(var itemObj in value[countryObj][cityObj])
{
document.write(" " itemObj value[countryObj][ cityObj][itemObj] "
")
}
} }
}



Explanation:

countryObj is an attribute value of the value object, value[countryObj] is the attribute value of the value object, here is a json object such as b, value[countryObj][cityObj] is the attribute value of the josn object b, which is also a json object. So value[countryObj][cityObj]["item"] can get the json object to temporarily become the value of c, or value[countryObj][cityObj].item.

In short, it is crucial to distinguish whether it is json or array.

Part 3

Copy code

The code is as follows:var value2 = {

"china":[

{"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 ":
")
for (var cityObj in value2[countryObj])
{
//You can use document.write(" " value2[countryObj][cityObj].item "
");
document.write(cityObj " " value2[countryObj][cityObj]["name"] "
" );
}
}

Explanation:

countryObj is the attribute name of the value2 object, value2[countryObj] is the attribute value of the value2 object. In this example, it is an array, cityObj is an element of the array, and it is another json object, so, value2[countryObj] [cityObj]["name"] can access the attribute value of the object's name, or you can access the attribute value through value2[countryObj][cityObj].name.

Part 4

Copy code The code is as follows:

var value2 = {
"china":[
{"name":"hangzhou", "item":"1"},
"china":[
{"name":"shanghai", "item":"2 "},
{"name":"sichuan", "item":"3"}
],
"America":[
{"name":"aa", "item ":"12"},
                                                                                                                                                   ", "item":"1"},
{"name":"dd", "item":"23"},
{"name":"ee", "item":"3 "}
]
};

for (var countryObj in value2)
{
document.write(countryObj ":
")
/ /document.write(" " value2[countryObj].length);
for (var i = 0;i {
document.write(" " value2[countryObj][i]["name"] "
");
}
}

Explanation:

The attribute name of the countryObj value2 object, value2[countryObj] attribute value. In this example, it is an array, value2[countryObj].length is the length of the array, and the items of the value2[countryObj][i] array == json object.

value2[countryObj][i]["name"] gets the value of name. You can also use value2[countryObj][i].name to get the value of name.