graph traversal javascript

1.js Array loop traversal. Array loop variable, the first thing to think about is the for (Var i=0;i In addition, you can use a simpler foreach method 2.forEach function. Both Firefox and Chrome's array types have foreach functions. Use the following: But above, the code does not work correctly in IE. Because IE's array does not have this method The execution of the above sentence is "undefined", which means that the A

、undefined、nullWhat do they stand for separately?1.NaN: First nan is not equal to Nan, then Nan is the first not a number to convert the data into numbers.2.undefined is a data type, a variable is not assigned, or the function is not declared and does not know what.1. The variable is not assigned, and is automatically assigned as undefined when declared.2. The function does not declare or access the function, or access to the variable, when calling the function, will return undefined3. When the

': [The]' 3 ': {' 5 ': ' abc ', ' 6 ': ' BCD '},};Through the For In loopfor (var i in a) {Console.log (a[i]);}Chrome,firefox Browser output: 1,ABC,Object { 5="abc", 6="BCD" },[1, 2, 3],function ();IE8 and the following browsers: 1,function (), ABC,[1, 2, 3], Object { 5="abc", 6="BCD"};There are two ways to solve this problem:The first is to change the key value of the number into a string, including letters or underscores;The second is to solve the compatibility of IE, by first travers

Detailed description of the text control for page traversal using Javascript This article mainly introduces the text control for page traversal by Javascript. If you need it, you can refer to it for help. The following function lists the IDs of all html controls whose types are text. The Code is as follows: Function

Look at a simple jquery example to traverse a JavaScript array object.var json = [{"id": "1", "TagName": "Apple"},{"id": "2", "TagName": "Orange"},{"id": "3", "TagName": "Banana"},{"id": "4", " TagName ":" Watermelon "},{" id ":" 5 "," TagName ":" Pineapple "}];$.each (JSON, function (idx, obj) {alert (obj.tagname);});The code snippet above works fine, prompting "Apple", "orange" ... And so on, as expected.Problem: JSON stringIn the following example,

The differences between for and for in javascript array Traversal There are two methods to traverse arrays in js: Copy codeThe Code is as follows:Var array = ['a']// Standard for LoopFor (var I = 1; I Alert (array [I])}// Foreach LoopFor (var I in array ){Alert (array [I])} Under normal circumstances, the above two methods traverse the array have the same result. First, the first difference between the t

# implements each traversal of a multidimensional array Algorithm-implements each traversal of a multidimensional array (JavaScript)

>Head>MetaCharSet= "Utf-8">Head>Body>Tableclass= "TB"Border= "1">TR> TD>Row1,cell1TD> TD>Row1,cell2TD>TR>TR> TD>Row2,cell1TD> TD>Row2,cell2TD>TR>Table>Buttontype= "button">Click MeButton>Scripttype= "Text/javascript"src= "./js/jquery-1.11.1.min.js">Script>Script>$ (document). Ready (function(){ $("Button"). Click (function(){ $("TD"). each (function() {alert ($ ( This). text ()); }) })})Script>Body>HTML>

1. js array looping. Array loop variables, the first thought of is the for (vari0; I lt; count; I ++) method. In addition, you can also use the relatively simple forEach method 2. forEach function. The Array types of Firefox and Chrome both have forEach... SyntaxHighlig 1. js Array traversal. Array loop variable, first thought of IS for (var I = 0; I New Document Script var arryAll = []; arryAll. push (1); arryAll. push (2); arryAll. push (3); ar

: the current element, the index of the current element, and the current array object. If the parameter thisobject is passed in, it will be treated as the this object inside the callback function (callback), and if it is not passed or null, the global object will be used.Map does not change the original array, remember: Only the array elements passed in before the callback function executes, the elements that are added after the callback function begins execution are ignored, and when the callba

Although arrays are objects in Javascript, it is not recommended to use a for in loop to traverse an array, in fact, there are many reasons to prevent us from using the for in loop for arrays.Because the for in loop will enumerate all the attributes on the prototype chain, and the only blocking method is to use hasOwnProperty to determine, this will be much slower than the normal for loop. Traverse The best way to traverse an array for maximum perfo

This article mainly introduces how to traverse and print arrays by JS, and analyzes the techniques related to JavaScript Array traversal and print output by using examples, if you need it, you can refer to the examples in this article to analyze the JS traversal array and print the array method. We will share this with you for your reference. The details are as f

Binary Tree postorder TraversalGiven a binary tree, return the postorder traversal of its nodes ' values.For example:Given binary Tree {1,#,2,3} , 1 2 / 3Return [3,2,1] .Note:recursive solution is trivial, could do it iteratively? The same recipe, the same flavor.Binary Tree inorder Traversal:Http://www.cnblogs.com/Liok3187/p/4808974.htmlBinary Tree Preorder Traversal:Http://www.cnblogs.com/Liok3187/p/4805834.html1 /**2 * Definiti

Binary tree traversal javascript Three types of traversal code: Function inOrder (node) {// traverse if (node! = Null) {inOrder (node. left); document. write (node. show () + ""); inOrder (node. right) ;}} function preOrder (node) {// traverse if (node! = Null) {document. write (node. show () + ""); preOrder (node. left); preOrder (node. right) ;}} function p

* @param callback [function] callback function; * @param context [object]; Array.prototype.myForEach = function Myforeach (callback,context) {Context = context | | window; if (' ForEach ' in Array.prototye) { This.foreach (callback,context); return; } Ie6-8 The logic for the execution of the callback function (var i = 0,len = This.length I /** * Map traverses array * @param callback [function] callback function; * @param context [object]; Array.prototype.myMap = f

are provided by the ECMAScript implementation, independent of the hosting environment, and appear when the ECMAScript program starts executing." This means that the developer does not have to instantiate the built-in object explicitly, it has been instantiated. ECMA-262 only defines two built-in objects, Global and Math (they are also local objects, by definition, each built-in object is a local object).Host ObjectAll non-local objects are host objects (host object), which is the object provide

...}, 4 Object { index=2, name="frie", age=72, 更多...} 5 ] Or, you can extend it in the following ways:View Source print? 01 if(!Array.prototype.map) 02 { 03 Array.prototype.map =function(fun/*, thisp*/) 04 { 05 varlen =this.length; 06 if

Sample Code for Javascript traversal of elements in a table This article mainly introduces how Javascript traverses the elements in the table. For more information, see For example: In JS, how does one traverse the value assignment?Program code var count=0;for(i=0; i See another way to use dom (but I did not try it out, I don't know why)

1. js Array loop traversal. array loop variable, the first thing to think about is the for (Var i=0;i In addition, you can use a simpler foreach method 2. The ForEach function.Both Firefox and Chrome's array types have foreach functions. Use the following: But above, the code does not work correctly in IE. Because IE's array does not have this method alert (Array.prototype.forEach);The execution of the above sentence is "undefined", which means t

The slave server returns a JSON string with the following content: var str = [{"id":"328482","user_id":"54","time":"1320214671"},{"id":"328283","user_id":"43","time":"1320046877"},{"id":"327075","user_id":"43","time":"1318740675"},{"id":"326153","user_id":"60","time":"1318144953"}] Remote links can be referenced in this way. This JSON is an object. How can I traverse this JSON object? You can search for a method from the Internet. Function allPrpos (obj) {// used to save all attribute names and