小白关于loadsh _.after的问题

Question

官方api的例子写的太简洁var saves = ['profile', 'settings'];var done = _.after(saves.length, function() {console.log('done saving!');});_.forEach(saves, function(type) {asyncSave({ 'type': type, 'complete': done });});不是很懂....求大神解释下### 题目描述