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问题 Let me explain my code a little bit (Excuse me if somethings wrong, I\'ve just written this example from scratch, it is very close to what I currently have). HTML: <form id=\"form\"> <!-- Friend 1 --> Name 1: <input type=\"text\" name=\"friendName1\" id=\"friendName1\" class=\"friendName\" value=\"\"><br /> Email 1: <input type=\"text\" name=\"friendEmail1\" id=\"friendEmail1\" value=\"\"><br /><br /> <!-- Friend 2 --> Name 2:<input type=\"text\" name=\"friendName2\" id=\"friendName2\" class=

问题 In jQuery, is it possible to invoke a callback or trigger an event after an invocation of .each() (or any other type of iterative callback) has completed . For example, I would like this \"fade and remove\" to complete $(parentSelect).nextAll().fadeOut(200, function() { $(this).remove(); }); before doing some calculations and inserting new elements after the $(parentSelect) . My calculations are incorrect if the existing elements are still visible to jQuery and sleeping/delaying some

问题 Now, This is the array, [1,2,3,4,5,6,7,8,9] I want, [1,2],[2,3],[3,4] upto [8,9] When I do, each_slice(2) I get, [[1,2],[3,4]..[8,9]] Im currently doing this, arr.each_with_index do |i,j| p [i,arr[j+1]].compact #During your arr.size is a odd number, remove nil. end Is there a better way?? 回答1: Ruby reads your mind. You want cons ecutive elements? [1, 2, 3, 4, 5, 6, 7, 8, 9].each_cons(2).to_a # => [[1, 2], [2, 3], [3, 4], [4, 5], [5, 6], [6, 7], [7, 8], [8, 9]] 回答2: .each_cons does exactly

问题 I have a JavaScript object like the following: var p = { \"p1\": \"value1\", \"p2\": \"value2\", \"p3\": \"value3\" }; Now I want to loop through all p elements ( p1 , p2 , p3 ...) And get their keys and values. How can I do that? I can modify the JavaScript object if necessary. My ultimate goal is to loop through some key value pairs and if possible I want to avoid using eval . 回答1: You can use the for-in loop as shown by others. However, you also have to make sure that the key you get is an