Backbone 集合UnderscoreMethods使用案例

Backbone 集合UnderscoreMethods使用案例

例子1 --collection.each

varBook = Backbone.Model.extend({

defaults : {

title :'unknown',

author :'unknown'

}

,publish:function(){

alert(this.get("title"));

}

});

varbooks = new Backbone.Collection([

newBook({ title:"java", author:"java author"}),

newBook({ title:"jsp", author:"jsp author"})

]);

books.each(function(book){

book.publish();

});

例子2 -- collection.map

varBook = Backbone.Model.extend({

defaults : {

title :'unknown',

author :'unknown'

}

,publish:function(){

alert(this.get("title"));

}

});

varbooks = new Backbone.Collection([

newBook({ title:"java", author:"java author"}),

newBook({ title:"jsp", author:"jsp author"})

]);

//titles -> ["java", "jsp"]

vartitles = books.map(function(book) {

returnbook.get("title");

});

例子3 -- collection.filter

varBook = Backbone.Model.extend({

defaults : {

title :'unknown',

author :'unknown'

}

,publish:function(){

alert(this.get("title"));

}

});

varjava = new Book({ title:"java", author:"java author"})

,ruby= new Book({ title:"ruby", author:"ruby author"})

,jsp= new Book({ title:"jsp", author:"jsp author"});

varbooks = new Backbone.Collection([java, ruby, jsp]);

//javaAuthorBook -> [java, ruby]

varjavaAuthorBook = books.filter(function(book) {

returnbook.get("author") === "java author" ||book.get("author") === "ruby author";

});

例子4 -- collection.sortBy

varBook = Backbone.Model.extend({

defaults : {

title :'unknown',

author :'unknown'

}

});

varjava = new Book({ title:"java", author:"java author"})

,ruby= new Book({ title:"ruby", author:"ruby author"})

,jsp= new Book({ title:"jsp", author:"jsp author"});

varbooks = new Backbone.Collection([ java, ruby, jsp ]);

//javaAuthorBook -> [java, jsp, ruby] a-z升序排列

varalphabetical = books.sortBy(function(book) {

returnbook.get("author").toLowerCase();

});

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