Question

tutorial: http://www.jamesyu.org/2011/01/27/cloudedit-a-backbone-js-tutorial-by-example/ I am going through the CloudEdit rails/backbone.js tutrorial and got stuck on the very first chunk of code. here it is:

var Document = Backbone.Model.extend({
  url : function() {
    var base =  documents ;
    if (this.isNew()) return base;
    return base + (base.charAt(base.length - 1) ==  /  ?    :  / ) + this.id;
  }
});

我所努力的路线是:

return base + (base.charAt(base.length - 1) ==  /  ?    :  / ) + this.id;

Since base = documents isn t base.charAt(base.length - 1) = s ? I know what it is supposed to do, I am just wondering why it does it. Does the value of base change to documents/ sometimes? Why not just write return base+ / +this.id

Answer 1

这条线等于

if last character is  / 
   return base + this.id
else 
   return base +  /  + this.id

仅凭return base+ / +this.id,即可得出一个包含base=”documents/“和id=6的模型的“文件//6”。

Update
As Adam Lassek mentioned in the comments, that line of should simply be written as

return base+ / +this.id

例如,<代码>底线变量在同一栏目中界定。然而,该法典也载于,主干法源代码 ,其宗旨如上所述。

而不是凌驾于<代码>url之上您应制定以下方法:

var Document = Backbone.Model.extend({
  urlRoot :  documents 
});

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