Unexpected =在coffeescript类定义中

我是咖啡脚本的新手,这个定义可能比这个问题本身更糟糕.

特定

class window.SlideManager                                                                                                                                                                     
  constructor: (@$contentDiv, @analyticsCanvas) ->                                                                                                                                            
    @iterator = Iterator(@slides)                                                                                                                                                             
    @slides = @$contentDiv.data('slides')                                                                                                                                                     

  nextSlide: ->                                                                                                                                                                               
    try {                                                                                                                                                                                     
      url = @iterator.next()                                                                                                                                                                  
    } catch {                                                                                                                                                                                 
      @iterator = Iterator(@slides)                                                                                                                                                           
      url = @iterator.next()                                                                                                                                                                  
    }                                                                                                                                                                                         

    this.renderSlide(url)                                                                                                                                                                     

  renderSlide: (slide) ->                                                                                                                                                                     
    $.get(slide, {nolayout: 'true'}, (data) ->                                                                                                                                                
      @$contentDiv.contents().replaceWith(data)                                                                                                                                               
      window.setupCanvas($(@analyticsCanvas), window.createChartData(window.getVisitCounts($(@analyticsCanvas))))                                                                             
    )                                                                                                                                                                                         

我在第8行(url = @iterator.next())遇到意外=语法错误

有谁知道我可能会缺少什么？