javascript - 在 Jquery 或 Javascript 中设置变量

Question

$('#firstname').bind('focusout focusin', function() {
    var get_firstname = $("#firstname").val().replace(/ /g, "+");
    var n_firstname = get_firstname.length;
    if (n_firstname > 2) {
        $(".firstname_good").fadeIn("fast");
        var firstname_v = 1;
    }
    else {
        $(".firstname_good").fadeOut("fast");
        var firstname_v = '';
    }
});​

我无法理解如何使用下面的 VAR firstname_v。在上面我需要做什么才能在下面使用它

$('#lastname').bind('focusout focusin', function() {
    if (firstname_v == 1) {
        alert(firstname_v);
    }
});​

Answer 1

您需要在两个内部作用域都可以访问的更高作用域中声明变量:

var firstname_v; // declare it

$('#firstname').bind('focusout focusin', function() {
    var get_firstname = $("#firstname").val().replace(/ /g, "+");
    var n_firstname = get_firstname.length;
    if (n_firstname > 2) {
        $(".firstname_good").fadeIn("fast");
        firstname_v = 1; // no var here, you're just setting it
    }
    else {
        $(".firstname_good").fadeOut("fast");
        firstname_v = ''; // no var here, you're just setting it
    }
});​

$('#lastname').bind('focusout focusin', function() {
    if (firstname_v == 1) { // no var here, you're just getting it
        alert(firstname_v);
    }
});​