javascript-objects

问题 A couple of days ago I was having fun with some js, when I came to the question if I could automate object nesting. Of course I'm still a newby so I haven't gotten too far. But what I got is this: var a = {}; var stso = ""; storing the second object function sto(b) { // start the object a[b] = {}; stso = b; } function nmo(...objs) { // nesting more object console.log(objs[0]); if(objs.length) { // checking to see that I have at least one variable before proceding for(i = 0; i < objs.length; i

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: How do I pass the this context into an event handler? I am doing a Javascript related assignment and am required to make a calendar which is associated with a particular input. The calendar is displayed constantly and does not hide, etc. There can be multiple calendars pointing to different text fields. Now, each calendar is created by a Javascript object, i.e. var cal1=new Calendar("inputfield_id"); Now the

问题 My data is currently stored in this format, stored in a JSON file: { "name": { "0": ______, "1": ______, "2": ______ }, "xcoord": { "0": ______, "1": ______, "2": ______ }, "ycoord": { "0": ______, "1": ______, "2": ______ } } And I need to convert it into this format, as an array of objects: [ { "id": 0, "name": _____, "xcoord": _____, "ycoord": _____ }, { "id": 1, "name": _____, "xcoord": _____, "ycoord": _____ }, { "id": 2, "name": _____, "xcoord": _____, "ycoord": _____ } ] As you can see

问题 I have an object literal like this: var test = { one: function() { }, two: function() { this.one(); // call 1 test.one(); // call 2 } }; What is the difference between the calls in the two function (using the object literal name versus using this )? 回答1: test is always bound within the closure of the two function to the variable test whereas this depends on how the function is called. If the function is called using the regular object member access syntax, this becomes the object owning the

问题 I am having trouble into sorting the following Object by KEY (DESC). Then, sorting each item by the "notesList.id" property (DESC). Expected order "2017/04/17" "2017/03/14" "2017/02/30" Then, for the "2017/04/17" notesList items, here is the Expected order : id:57 id:48 id:12 The JS Object var myNotes = { "customNotes":{ "2017/04/17":{ "concernedDate":"2017/04/17", "notesList":[ { "id":48, "title":"Title 48" }, { "id":12, "title":"Title 12" }, { "id":57, "title":"Title 57" } ] }, "2017/02/30"

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . I would like to take the following php/mysql loop, and apply the results: $test,$test1,$test2 to the var Data object in the javascript code. This will make the var Data dynamic, pulling its data to construct the

问题 I'm trying to create a simple JS game engine on my own. Here's the code for one of the states. var menuState = { //state variables menuBttn: {x: _canvas.width/2, y:_canvas.height/2, img: imageArray[2], over: false, click: function(){changeState(2);}}, preload: function () { }, update: function(){ surface.clearRect(0, 0, _canvas.width, _canvas.height); for (var i = 0; i < menuAssets; i++){ surface.drawImage(menuState.menuBttn.img , menuState.menuBttn.x, menuState.menuBttn.y); console.log

问题 I would like to retain some properties from an array of javascript objects. Here is the array of objects. obj_array = [{ "CHR_ID": 1, "CHR_NAME": "Jim", "CHR_BB_TYP": 2, "CHR_MAC": "5474", }, { "CHR_ID": 3, "CHR_NAME": "Fro", "CHR_BB_TYP": 33, "CHR_MAC": "8e30", }, { "CHR_ID": 2, "CHR_NAME": "Jimb", "CHR_BB_TYP": 2, "CHR_MAC": "45e8", }, { "CHR_ID": 4, "CHR_NAME": "Kht1", "CHR_BB_TYP": 35, "CHR_MAC": "58d0", }, { "CHR_ID": 6, "CHR_NAME": "Sens", "CHR_BB_TYP": 34, "CHR_MAC": "d004", } ] I have

问题 In another SO question about whether to call a super-constructor or use the prototype chain the answer provided by one of the users seemed sensible but didn't work for me when I implemented it on my solution which has multiple layers of inheritance. Here's the answer I'm referring to: https://stackoverflow.com/a/4389429/392591 So I've created a jsFiddle using this custom extend method to illustrate the problem: https://jsfiddle.net/68q7yghv/ I've added the jsFiddle code at the bottom. In my

问题 Wish to merge two objects. However, when a property "date" with same value exists in both the objects, the other properties (tag1 and tag2) are to be clubbed under the same date. Example input var myVar1 = [ { "date": "2015-07-16", "tag1": 35.34}, { "date": "2015-07-18", "tag1": 34.12} ]; var myVar2 = [ { "date": "2015-07-16", "tag2": 45.34}, { "date": "2015-07-17", "tag2": 44.12} ]; Desired output mergedVar = [ { "date": "2015-07-16", "tag1": 35.34, "tag2": 45.34}, { "date": "2015-07-17",