javascript map foreach

Tag: text NULL index false size script new get elementUse JavaScript to imitate Java map function, group training work, record!Write a map with JavaScript

Script> vararr= [2,3,6,7,9]; //javascriptin theForEachand theMapmethod arr.ForEach(function(value,Index){//(value,Index) Console.Log(value);}); arr.Map(function(value,Index){//(value,Index) Console.Log(value);}); //jqueryof theEach mapmethod $(arr). each(function(Index,value){//(Index,value) Console.Log(Index);}); $. each(arr,function(Index,value){//(Index,value) Console.Log(Index);}); $.Map(arr,func

/* "map meaning, map to a new array, an array of certain operations" */ var arr=[1,3,5,6var computedarr = Arr.map (function(item) { return item*item*item; }); Console.log (Computedarr); // [1, 216]FilterCreates a new array that matches the filter criteria.Example-1 (No filter):vararr = [ {"Name": "Apple", "Count": 2}, {"Name": "Orange", "Count": 5}, {"Name": "Pear", "Count": 3}, {"Name": "Oran

Purpose: To obtain the id value of each multi-box; Each method: Defines an empty array, and adds the id value to the array through the each method. After the array is converted to a string, alert this value; $ (Function(){VaRArr =[]; $ (": Checkbox"). Each (Function(Index) {arr. Push (This. ID );});VaRSTR = arr. Join (","); Alert (STR );}) Map Method: Run return this for each: checkbox. ID; then, the returned values are automatically saved

has not been able to adhere to the habit of blogging, after n months once again write a blog, is also the first technical blog, the example project is two or three months ago in the school wrote, writing is also relatively simple, the first contact API development, mostly just divert, their programming ability needs to improve. A brief introduction to this example, the main function of the example is to display the location of Guangzhou tourist attractions and related information, can achieve lo

Code:View CodeSpecific steps: 1, Baidu Search: Baidu Map generator2. Open the first one, copy the URL http://api.map.baidu.com/lbsapi/creatmap/index.html, open3, the page is displayed as4, according to your request to modify5. Finally get the code, and then copy the code. JavaScript (v)--Insert Map

JavaScript simulates implementing a map in the Java languageImplementation code:JavaScript simulates implementing a map in the Java language

Paste it down:JS Code paste:Interested can refer to the Baidu API document learning: http://developer.baidu.com/map/jsdemo.htmBaidu Map API JavaScript shows people distribution information

The JavaScript array map () method creates a new array that uses the results of the functions provided on each element of this array.Grammar Array.map (callback[, Thisobject]); The following are the details of the parameters: Callback: The element that produces the new array from the current element function. Thisobject: Object is used as the execution callback return value: R

var n = {1:100, 2:101, 3:102, 4:103};How to get the length of this object n?Method One:function GetLength (obj) {var count = 0;for (var i in N) {count++;}return count;}Improvement plus a hasOwnProperty judgment filter the properties in the prototype are more secure.function GetLength (obj) {var count = 0;for (var i in N) {if (N.hasownproperty (i)) {count++;}}return count;}Method Two://Do not consider the case of hasOwnPropertyfunction GetLength (obj) {return Object.key (n). length;}Gets the leng

This is the day in the group to hear someone do this function, thus generating interest. Also want to try, referring to the KK on GitHub example Https://github.com/kunkun12/MapSwipe, the example is written in detail, I do not repeat here. Look first:In fact, the principle is very simple, is to set the second add in the layer of the div container width and height.Here's what I learned from the small experience: in the above there are 2 radio button buttons, we choose the horizontal roller shutter

JavaScript implements the Java map, list functionality, as follows: function HashMap () { this.size=0; This.map=new Object (); } Hashmap.prototype.put=function (Key,value) { if (!this.map[key]) { this.size++; } This.map[key]=value; }; Hashmap.prototype.get=function (key) { return This.iskey (key)? This.map[key]:null; }; Hashmap.prototype.iskey=function (key) { Return (ke