javascript 使用 underscore.js 迭代对象
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Iterating objects with underscore.js
提问by Industrial
So, I am learning out backbone.js and are currently iterating over some models in a view with the below example. The first snippet works, when the other underscore.js-based one doesn't. Why?
因此，我正在学习backbone.js 并且目前正在使用以下示例在视图中迭代某些模型。第一个片段有效，而另一个基于 underscore.js 的片段无效。为什么？
// 1: Working
this.collection.each(function(model){ console.log(model.get("description")); });
// 2: Not working
_.each(this.collection, function(model){ console.log(model.get("description")); });
What am I doing wrong, as I can't see it by myself?
我做错了什么，因为我自己看不到它？
回答by Esailija
this.collectionis an instance while this.collection.eachis a method that iterates the proper object under the covers which is the .modelsproperty of a collection instance.
this.collection是一个实例 whilethis.collection.each是一个方法，它在掩护下迭代适当的对象，这是.models集合实例的属性。
With this said you can try:
有了这个，你可以尝试：
_.each(this.collection.models, function(model){ console.log(model.get("description")); });
Which is completely pointless as this.collection.eachis a function that does similar to:
这是完全没有意义的，因为this.collection.each它的功能类似于：
function(){
return _.each.apply( _, [this.models].concat( [].slice.call( arguments ) ) );
}
So you might as well use this.collection.each;P
所以你不妨使用this.collection.each;P
回答by coliath
Also, you could try...
另外，你可以试试...
_.each(this.collection.models, function(model){
console.log(model.get("description"));
});
