javascript - JavaScript/jQuery：SyntaxError：函数语句需要名称

Question

我有一个功能可以在用户单击下一个/上一个按钮时更改字段集。

//jQuery time
var current_fs, next_fs, previous_fs; //fieldsets
var left, opacity, scale; //fieldset properties which we will animate
var animating; //flag to prevent quick multi-click glitches

$(".next").click(function() {
  if (animating) return false;
  animating = true;

  current_fs = $(this).parent();
  next_fs = $(this).parent().next();

  //activate next step on progressbar using the index of next_fs
  $("#progressbar li").eq($("fieldset").index(next_fs)).addClass("active");

  //show the next fieldset
  next_fs.show();
  //hide the current fieldset with style
  current_fs.animate({
    opacity: 0
  }, {
    step: function(now, mx) {
      //as the opacity of current_fs reduces to 0 - stored in "now"
      //1. scale current_fs down to 80%
      scale = 1 - (1 - now) * 0.2;
      //2. bring next_fs from the right(50%)
      left = (now * 50) + "%";
      //3. increase opacity of next_fs to 1 as it moves in
      opacity = 1 - now;
      current_fs.css({
        'transform': 'scale(' + scale + ')',
        'position': 'absolute'
      });
      next_fs.css({
        'left': left,
        'opacity': opacity
      });
    },
    duration: 800,
    complete: function() {
      current_fs.hide();
      animating = false;
    },
    //this comes from the custom easing plugin
    /* easing: 'easeInOutBack' */
  });
});

$(".previous").click(function() {
  if (animating) return false;
  animating = true;

  current_fs = $(this).parent();
  previous_fs = $(this).parent().prev();

  //de-activate current step on progressbar
  $("#progressbar li").eq($("fieldset").index(current_fs)).removeClass("active");

  //show the previous fieldset
  previous_fs.show();
  //hide the current fieldset with style
  current_fs.animate({
    opacity: 0
  }, {
    step: function(now, mx) {
      //as the opacity of current_fs reduces to 0 - stored in "now"
      //1. scale previous_fs from 80% to 100%
      scale = 0.8 + (1 - now) * 0.2;
      //2. take current_fs to the right(50%) - from 0%
      left = ((1 - now) * 50) + "%";
      //3. increase opacity of previous_fs to 1 as it moves in
      opacity = 1 - now;
      current_fs.css({
        'left': left
      });
      previous_fs.css({
        'transform': 'scale(' + scale + ')',
        'opacity': opacity
      });
    },
    duration: 800,
    complete: function() {
      current_fs.hide();
      animating = false;
    },
    //this comes from the custom easing plugin
    /* easing: 'easeInOutBack' */
  });
});

但是，截至今天，我不断收到“SyntaxError：函数语句需要名称”错误。什么也没有变。

我尝试将所有内容包装在 function() 调用中，但无济于事。我该如何解决？

谢谢！

标签： javascriptjquery