javascript mind map

map Definitions and methodsThe Map () method returns a new array in which the elements of the array are called after the function is processed by the original array element. Map () method processes the elements sequentially, in the order of the original array elements. note: map does not detect an empty

In the daily use of the map process, you will often encounter map labels, cue points and other displays do not meet our needs, need to write JavaScript code.For example, in the process of using the map, you will find that many place names appear to deviate. This is when you need to use

Map ()For example, for example, we have a function f (x) =x2, to function on an array [1,2,3,4,5,6,7,8,9].Because the map () method is defined in the JavaScript array, we call the map () method of array and pass in our own function, and we get a new array as the result:function Pow (x) { return x*x; } var

The examples in this article describe the JavaScript analog map output and the method of removing duplicates. Share to everyone for your reference. The specific methods are as follows: 1.Javascriptmap output function Map () {//private var obj = {};//Empty object container, bearing key value pair//put method this.put = function (key, value) {Obj[key] = VA

| 24 | [PNG data] 5 | 15 | 25 | [PNG data] This table is easy to query for a particular tile: for example, the query level is 8, the column number is 116, the row number is 192 of the tile data: SQLite>SELECTfromWHERE=8and=116 and=192; [PNG data] Tile_data is a binary stream file that can be easily read from the Mbtiles database, whether it's a desktop app or Android or iOS app. Here is a demo program I made with Delphi: Cita

encapsulate a compatible method, the code is as follows: /** * The foreach traversal array * @param callback [function] callback function; * @param context [object] context;*/Array.prototype.myForEach=functionMyforeach (callback,context) {context= Context | |window; if(' ForEach 'inchArray.prototye) { This. ForEach (Callback,context); return; } //Ie6-8 Write your own callback function execution Logic for(vari = 0,len = This. length; I ) {Callback Callback.call (Context, This[I],i, T

the array pass the test of the specified function. Every () does not change the original array.Grammar:Arr.every (callback[, Thisarg])Parameters:1. Callback: A function executed on each item of the array, receiving three parameters:CurrentValue (the value of the current item), index (the current item's indexes), and array (the array itself);2. Thisarg: Optional parameter. An object that is used as the value of this in the callback function, that is, the execution context of the callback functio

MapIs the structure of a set of key-value pairs with extremely fast lookup speeds.For example: Find students ' grades, normal Arry array operations Create two ordinary Arryvar name = {' aaaa ', ' bbbb ', ' CCCC '};var scores = {96,97,98}Given a name, to find the corresponding score, first to find the corresponding position in the names, and then remove the corresponding results from scores, the longer the array, the longer the time.If you use map to a

Implementation of Baidu map ABCD marker based on Arcgis for javascript, arcgismarker First, we will show you the effect after implementation: For the sake of intuition, first paste out the effect I have made List display and Map Display and linkage Display Information Implementation ideas: 1. Interaction between lists and maps When the cursor goes through the l

Recently learning JavaScript, in the middle see map and reduce method, feel very interesting, learn to write this blog.Both of these functions embody the idea of functional programming to some extent, and the function is passed as an argument to another function.The caller of the map () method is typically an array, and the parameter is a function called callback

: 　　/*** foreach Traversal array * @param callback [function] callback function; * @param context [object] context; */array.prototype.myforeach = function MyF Oreach (callback,context) { context = context | | window; if (' ForEach ' in Array.prototye) { This.foreach (callback,context); return; } Ie6-8 write the callback function execution logic for (var i = 0,len = This.length; i 　　/*** Map Traversal Array * @param ca

Map -JavaScript is case-sensitive, map is the data type, and map is the method defined in the array. The map () method is a higher-order function than the iterable foreach () method. Map () performs its parameter function on each

/css"href= "Http://serverapi.arcgisonline.com/jsapi/arcgis/1.5/js/dojo/dijit/themes/tundra/tundra.css">8 Scripttype= "Text/javascript"src= "http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.5">Script>9 Scripttype= "Text/javascript"> Ten One Dojo.require ("Esri.map"); A functioninit () { - - //Add a slider with no scale the EsriConfig.defaults.map.sliderLabel= N

/css"href= "Http://serverapi.arcgisonline.com/jsapi/arcgis/1.5/js/dojo/dijit/themes/tundra/tundra.css">8 Scripttype= "Text/javascript"src= "http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.5">Script>9 Scripttype= "Text/javascript"> Ten One Dojo.require ("Esri.map"); A functioninit () { - - //Add a slider with no scale the EsriConfig.defaults.map.sliderLabel= N

WEX5 provides a BMAP component to call Baidu Maps, in the Baidu map API, there are many versions of the API for developers to call. In WEX5 development, the JavaScript API is integrated, tested, and successful. Today, starting from 0, step-by-step operation, in the future will produce more complex map and positioning effects, we learn together and progress togeth

'). Contentdocument get Svgdom, Otherwise, you will not get the svgdom. That's what I wrote:if (iframe.attachevent) { Iframe.attachevent (' onload ', function () { Alert (' iframe is loaded ') })}else{ Iframe.onload = function () {Get Svgdom herevar iframesvg = document.getElementById (' iframe '). Contentdocument;Next, you can manipulate the svgdom, bind elements, click events, change the attributes of the elements, and so on.Bind a point-and-click event to an element with Id '

This article is the author's personal summary of some of the judging conditions when looking at the Liaoche teacher JavaScript tutorialnull、undefined、0、NaNand an empty string‘‘Asfalse, all other values are consideredtrue, so the result of the above code condition judgment istrueLoop 1.for (same c) 2.while (same as C) 3.do while (same as C) Variant for...in Traversal object only Traverse property, no value for property Iterating through an array only i

Suppose that there is a function f (x) =x2; the function is in an array [1,2,3,4,5,6,7,8,9], which is usually implemented by means of traversal.function f (x) { return x * x; } var arr = [1,2,3,4,5,6,7,8,9]; var result = []; for (var i=0; i) {Result.push (f (arr[i)) }This can be done, but we have a more elegant implementation.function f (x) { return x * x;} var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9// [1, 4, 9, +, +, +, +, +, Bayi]The map () metho

Reference yesterday's content, have a friend or ask how to call Baidu map, also, who let us all in the domestic, no way, you understand.First go to apply for a key, and then look at the first example of Baidu JavaScript: http://developer.baidu.com/map/jsdemo.htmThe next step is to move the code in the example to Twebbrower.Unit Unit3;InterfaceUsesSystem.sysutils,

"Turn" from:http://blog.csdn.net/semanwmj/article/details/7066306 JavaScript is always used for Web pages, and JSON is always used with JavaScript. If you use it recently, write it.Here is a summary:1. Convert the array in JavaScript and {} into JSON string can use Json2.js, source address Https://github.com/douglascrockford/JSON-js.2. To convert a JSON string t