each | 易学教程

jQuery.each implementation differs from native Array.forEach

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问题 Does anyone why is the otherwise excellent jQuery.each function is designed differently from the (now) native Array.forEach ? F.ex: var arr = ['abc','def']; arr.forEach(function(entry, index) { console.log(entry); // abc / def }); This makes absolute sense. But jQuery chose to put the index as first argument: $.each(arr, function(index, entry) { console.log(entry); }); Does anyone know the reasoning behind this design decision? I have always used $.each extensively, but it always bugged me

jQuery when each is completed, trigger function

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how do start a function like redirecting to a new page when .each is done looping my elements? this is my current code: $('#tabCurrentFriends > .dragFriend').each(function(){ var friendId = $(this).data('rowid'); $.ajax({ type: "POST", url: "../../page/newtab.php", data: "action=new&tabname=" + tabname + "&bid=" + brugerid + "&fid=" + friendid, complete: function(data){ } }); }); Jasper You can use $.when() / $.then() to redirect your users after all the AJAX requests are done: //create array to hold deferred objects var XHRs = []; $('#tabCurrentFriends > .dragFriend').each(function(){ var

jQuery, get ID of each element in a class using .each?

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问题 I'm trying this to get the id of each element in a class but instead it's alerting each name of the class separately, so for class="test" it's alerting: t , e , s , t ... Any advice on how to get the each element id that is part of the class is appreciated, as I can't seem to figure this out.. Thanks. $.each('test', function() { alert(this) }); 回答1: Try this, replacing .myClassName with the actual name of the class (but keep the period at the beginning). $('.myClassName').each(function() {

jQuery 'each' loop with JSON array

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问题 I'm trying to use jQuery's each loop to go through this JSON and add it to a div named #contentHere . The JSON is as follows: { "justIn": [ { "textId": "123", "text": "Hello", "textType": "Greeting" }, { "textId": "514", "text":"What's up?", "textType": "Question" }, { "textId": "122", "text":"Come over here", "textType": "Order" } ], "recent": [ { "textId": "1255", "text": "Hello", "textType": "Greeting" }, { "textId": "6564", "text":"What's up?", "textType": "Question" }, { "textId": "0192"

Resit Assignment – CSC3060 “AIDA”

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Resit Assignment – CSC3060 “AIDA” Release date: Friday 5th August Deadline: 11:00pm Sunday 11 th August 2019. This version: 2019-07-04. Introduction This assignment re-assesses key practical and theoretical learning outcomes from the CSC3060 module. With the exception of Section 1, this assignment must be completed in R. Section 1 can be completed in Python (recommended), Java or R. Convenient and commonly used machine learning packages are available for R and Python, such as “class”, “caret” and “randomForest” (in the case of R). When you use a procedure that has an element of randomness (e.g

COMP3331/9331 Computer Networks and Applications

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COMP3331/9331 Computer Networks and Applications Assignment for T2 2019 (19T2) Version 1.0 1. Change Log Version 1.0 released on 19th June 2019 (Week 3). 2. Due date: Due: 17:00 Hours Friday, 9th August 2019 (Week 10). 3. Goal and learning objectives For this assignment, your task is to implement the link state routing protocol. Your program will be running at all routers in the specified network. At each router, the input to your program is a set of directly attached routers (i.e. neighbours) and the costs of these links. Each router will broadcast link-state packets to all other routers in

Graph Theory: Representation and Algorithms

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Summer Project - 2019 Graph Theory: Representation and Algorithms 1 Introduction In order to complete this project successfully, the student should be familiar with many basic notions of graph theory. The questions below whose answers should be included in the project report will force the student to go over these necessary background notions about graphs. Most of the background can be studied in the following references, specially Cormen textbook where graph definitions can be found in Appendix B.4 and the Graph Algorithms can be read in chapters 22 to 26. 1. Introduction to Algorithms, T.H.

Educational Codeforces Round 68 Editorial

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题目链接： http://codeforces.com/contest/1194 A. Remove a Progression time limit per test:2 seconds memory limit per test: 256 megabytes input: standard input output: standard output You have a list of numbers from 1 1 to n n written from left to right on the blackboard. You perform an algorithm consisting of several steps (steps are 1 1-indexed). On the i i-th step you wipe the i i-th number (considering only remaining numbers). You wipe the whole number (not one digit). When there are less than i i numbers remaining, you stop your algorithm. Now you wonder: what is the value of the x x-th

如何获得网页中的json数据

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在python抓取图片的时候，有时候却找不到对应的网址，可能存在json中，所以如何用python解析json数据，小白看了几个论坛后自己总结一些以便加深印象。 1.requests.get(url,params) 获得请求数据 import requests def get_many_pages(keyword, page): params = []#收集不同页面的json数据 for i in range(30, 30*page, 30):#动态加载，每页30个 params.append({ 'tn': 'resultjson_com', 'ipn': 'rj', 'ct': 201326592, 'is': '', 'fp': 'result', 'queryWord': keyword, 'cl': 2, 'lm': -1, 'ie': 'utf-8', 'oe': 'utf-8', 'adpicid': '', 'st': -1, 'z': '', 'ic': '', 'word': keyword, 's': '', 'se': '', 'tab': '', 'width': '', 'height': '', 'face': 0, 'istype': 2, 'qc': '', 'nc': '' , 'fr': '', 'pn': i, 'rn': 30, 'gsm'

Should I use jQuery.each()?

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问题 I'm doing very frequent iterations over arrays of objects and have been using jQuery.each(). However, I'm having speed and memory issues and one of the most called methods according to my profiler is jQuery.each(). What's the word on the street about its performance? Should I switch to a simple for loop? Of course I'm fixing the many issues in my own code too. 回答1: The source code for jQuery's each is as follows (Thank you John Resig and MIT License): each: function( object, callback, args )