javascript - Uncaught ReferenceError : topPos is not defined

Question

我的代码遇到了问题。它在 html 中工作正常。当我转换为 Wordpress 时，当我按下按钮以显示底部隐藏信息时收到错误消息。

单击按钮后显示此错误未捕获的 ReferenceError:未定义 topPos

这是我的代码

 $(".info-data").hide();
    var activeInfoData = $(".info-nav .active a").attr("href");
    $(activeVehicleData).show();

$('.info-nav-scroll').click(function () {
    var direction = $(this).data('direction');
    var scrollHeight = $('.info-nav li').height() + 1;
    var navHeight = $('#info-nav-container').height() + 1;
    var actTopPos = $(".info-nav").position().top;

    // Scroll Down
    if (direction == 'down' && -navHeight <= actTopPos - (scrollHeight * 2)) {
        topPos = actTopPos - scrollHeight;
        $(".info-nav").css('top', topPos);
    }

    // Scroll Up
    if (direction == 'up' && 0 > actTopPos) {
        topPos = actTopPos + scrollHeight;
        $(".info-nav").css('top', topPos);
    }
    return false;
});

Answer 1

定义 topPos 变量在点击函数的一侧或外侧

var topPos = '';  // or  var topPos = 0;
var direction = $(this).data('direction');
var scrollHeight = $('.info-nav li').height() + 1;
var navHeight = $('#info-nav-container').height() + 1;
var actTopPos = $(".info-nav").position().top;

您可以阅读更多关于 scope of variable in Javascript 的信息.