Javascript 未捕获类型错误：无法读取属性'；偏移量'；未定义的

我得到未捕获的TypeError:无法读取未定义的属性“offset”

在此之前，我从同一块中得到了相同的“top”异常。我现在用一种方法修复了它，我得到了带有“offset”的错误

这是我的密码

var ssSmoothScroll = function() {

    $('.smoothscroll').on('click', function (e) {
        if (this.hash !== "" && this.pathname == window.location.pathname) {
        var target = this.hash;
        // $target    = $(target);


        e.preventDefault();
        e.stopPropagation();

        var topOffset = 0; //#top should default to 0 so no need to calculate the difference between top and top :)
            if (target != "#top") { //If the target is not "#top", then calculate topOffset 
            var topOffset = $(target).offset().top;
            }
        }
        else{
                var target = this.hash,
                $target    = $(target);

                e.preventDefault();
                e.stopPropagation();

        }
        $('html, body').stop().animate({
            'scrollTop': $target.offset().top
        }, cfg.scrollDuration, 'swing', function () {
            window.location.hash = target;
        });
    });
};

---

非常感谢您的帮助：）

因为您在else语句中定义了

$target

，所以如果它没有进入else语句，它将是未定义的

您需要在else之外设置

$target

if (target != "#top") {
  // you do not set it here
  ...
else{
  var target = this.hash,  // <-- not sure why you are declaring target again....
  $target    = $(target); // you set it here
  ...
}

if（目标！=“顶部”）{
//你不能把它放在这里
...
否则{
var target=this.hash，//试试这段代码，我认为这是可行的

var ssSmoothScroll = function() {
  $(".smoothscroll").on("click", function(e) {
    if (this.hash !== "" && this.pathname == window.location.pathname) {
      var target = this.hash,
        $target = $(target);
      // $target    = $(target);

      e.preventDefault();
      e.stopPropagation();

      var topOffset = 0; //#top should default to 0 so no need to calculate the difference between top and top :)
      if (target != "#top") {
        //If the target is not "#top", then calculate topOffset
        topOffset = $(target).offset().top;
      }
      $("html, body")
        .stop()
        .animate(
          {
            scrollTop: $target.offset().top
          },
          cfg.scrollDuration,
          "swing",
          function() {
            window.location.hash = target;
          }
        );
    }
  });
};

我认为
这
指的是事件参数