JavaScript gets the position of the element relative to the browser ie5, 6, 7, 8, 9, 10 test passed
Each element node in the dom has a layout positioning attribute offsetLeft relative to the parent node, offsetTop getPosition: function (el) { _x = 0, _y = 0; while (el.offsetParent !== null) { _x += el.offsetLeft; _y += el.offsetTop; el = el.offsetParent; } return { x: _x, y: _y }; }
Recursive algorithm chess piece movement java, 7, java data structure and algorithm: analysis and implementation of the eight queens problem, recursive backtracking…
What is the Eight Queens Problem: It means that on an 8 * 8 chessboard, 8 chess pieces are placed to ensure that these 8 chess pieces are not in the same row, column, or diagonal with each other. How many ways are there? How to place? Game link: http://www.4399.com/flash/42643.htm#search3 Directly enter the code: public class QueueLv8 { int maxSize =8; int[] array = new int[maxSize]; static int count &# 61; 0;//Number of correct answers static int okCount = 0;//Number of judgments public static void main(String[] args){ //8 Queen Problem: It refers to how many ways are there to place 8 chess pieces on an 8 * 8 chessboard to ensure that these 8 chess pieces are not in the same row, column, or diagonal with each other. Pendulum method? There are 92 pendulum methods in total //The 8-queen problem is implemented using recursion, which embodies the idea of backtracking. //It is implemented using a one-dimensional array, such as: int[8] = {0,4,7,5,2,6,1,3}, means: the i+1st queen is placed on the i+1th row of the chessboard, the int[i]+1 column. This is very important. If you understand this, you can understand the following algorithm //The first queen is placed in row 1…
How does the php array elegantly convert 1,2,4,5,6,7,9,11 into strings like ‘1,2,47,9,11’?
As the title There is a php array 1234 [1,2,4,5, 6,7,9,11] [7,11,16,17,18,33,102,103,555] Elegant conversion to 12 ‘1,2,4-7,9, 11’ ‘7,11,16-18,33,102-103,555’ like this What about strings? Thank you for your answer.
underscore knowledge points_error: partition(s) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,_cily_undefined’s blog
1. Installation Node. js –> npm install underscore Meteor.js –> meteor add underscore Require.js –> require([“underscore”], … Bower bower –> install underscore Component –> component install jashkenas/underscore Second, aggregate function (array or object) 1, each Syntax: _.each(list, iteratee, [context]) Description: Traverse all elements in the list, and call the iteratee function with each element as a parameter in order. If the context parameter is passed, bind iteratee to the context object. Each call to iteratee passes three parameters: (element, index, list). If list is a JavaScript object, the arguments to iteratee are (value, key, list)). Return a list to facilitate chain calls. Example: _.each([1, 2, 3], alert); => alerts each number in turn… _.each({one: 1, two: 2, three: 3}, alert); => alerts each number value in turn… 2, map Syntax: _.map(list, iteratee, [context]) Description: Generate a corresponding array by calling the conversion function (iteratee iterator) for each element in the list. iteratee passes three parameters: value, then the iteration index (or key Fool’s Wharf note: if the list is a JavaScript object, this parameter is the key), and the last one is a reference to the entire list. Example: _.map([1, 2, 3], function(num){ return num * 3; }); => [3,…
