id
在model.attributes中,需要用户自行定义,可不定义,获取方法:model.get('id')
cid
collection中每个model都有的属性,由backbone自动生成,获取方法:model.cid
idAttribute
在model中,用于指定使用model.attributes中哪个键作为id,默认情况下是model.attributes.id,需要用户自行定义,可不定义,获取方法:model.idAttribute
当使用set进行智能判断操作时,只有idAttribute指定的键相同的情况会把该操作视为change
DEMO
1 var TodoCollection = new Backbone.Collection(); 2 3 TodoCollection.add([ 4 5 {id:1,title: 'go to a', completed:true}, 6 7 {title: 'go to b', completed:false}, 8 9 {title: 'go to c', completed:false}, 10 11 ]); 12 13 TodoCollection.on('add', function(model){ 14 15 console.log('add:' + model.get('title')); 16 17 }); 18 19 TodoCollection.on('remove', function(model){ 20 21 console.log('remove:' + model.get('title')); 22 23 }); 24 25 TodoCollection.on('change', function(model){ 26 27 console.log('change:' + model.get('title')); 28 29 }); 30 31 TodoCollection.set([ 32 33 {id:1,title: 'go to a', completed:false}, 34 35 {title: 'go to b', completed:false}, 36 37 {title: 'go to c', completed:false}, 38 39 ]);
该代码的执行结果是
1 change:go to a 2 remove:go to b 3 remove:go to c 4 add:go to b 5 add:go to c