使用javascript解析JSON并获取数组中的特定值

Question

In my console log the array look like this:

{"userid":"5502","fullname":"My fullname","email":"sample@yahoo.com","user_access":"real"}

Now on my ajax, I have a handle code for the data array that the server sends to the app:

function handleData(responseData) {
    var access = responseData;

    console.log(access);
    if (access == '"real"') {
        alert("Welcome");
        location.href = "home.html";
    } else {
        alert("Your username and password didn\'t match.");
    }
}

How I can get the specific value of this "user_access":"real" in array and use it in condition.

like this:

if (access == '"real"') { // What should be the format of access variable?
    alert("Welcome");
    location.href = "home.html";
}

Answer 1

function handleData(responseData) {
                var response = JSON.parse(responseData);//assuming you are getting the response as a string

                var access = response.user_access;    
                console.log(access);

                if (access == "real") {
                    alert("Welcome");
                    location.href = "home.html";    
                } else {
                    alert("Your username and password didn\'t match.");
                }    
            }//handleData()

Normally, we want our response to be in json ( or we can say 'object' ) form, so that we can easily access its inner properties. So, if it's already an object, you do not need to use JSON.parse . You can directly access any property like this - responseData.user_access . But if it's in string form, then you have to use JSON.parse() first to parse the string into JSON ( or object ) format.

Answer 2

If it is not surrounded by "" around the {} brackets then just do

function handleData(responseData) {
    var access = responseData.access;
    if (access === 'real') {
        alert("Welcome");
        location.href = "home.html";
    } else {
        alert("Your username and password didn\'t match.");
    }
}