jQuery动态函数和变量

Question

I am trying to create a function that handles the 'keyup' event for several input fields and passes the input value to a php script. Here's the code I have so far

$(document).ready(function () {

    $("#email").keyup(function () {

        val = $("input#email").val();
        what = 'email';

        aFunction(val, what);

    });

});

function aFunction(val, what) {

    var dataString = what + '=' + val;
    var error = "email_check";

    $.post("key.php", dataString, function (data) {
        //if (data.[error] == 'invalid'){
        if (data.email_check == 'invalid') {
            $("#ppp").html('error');
        } else {
            $("#ppp").html('good to go');
        }
    }, "json");

    //return false; 
}

When I uncomment

//if (data.[error] == 'invalid'){

and comment out

if (data.email_check == 'invalid'){

My the script doesnt execute and js file doesn't load into the firebug script console - I assume means there's an error because when I undo that and refresh I can view it. I've tried added single and double quotes to the variable. Also, it would be helpful if there was a way to see what the is error is, but I don't know how to do that.

Answer 1

这里的主要问题是，您应该使用点符号（“ data.error”）或数组符号（“ data ['error']”），但不能同时使用两者（“ data。['error']”）。

Answer 2

Javascript does not support braces in identifiers.

If the key is actually just error , you can write if (data.error == 'invalid') .
If it is [error] , you'll need to write if (data['[error]'] == 'invalid )`.

To see syntax errors, go to Firebug's Console tab.