look at the following code: function test(){ console.log(this === window); show(); window.show(); function show(){ console.log(this === window, fn ); } } function show(){ console.log(this === window, local ); } tes...
var a = 10; var obj1 = { a: 20, fn: (function() { this.a *= 2; a = 5; var a = 6; return function() { this.a *= a; console.log(a) } })() } var obj2 = { a: 30 } var fn = obj1.f...
A topic about the scope of JS functions related codes var xyx = 1; function fx(){console.log(xyx)} var xyx = 2; fx(); The result of the output is 2. isn t it supposed to look from the inside to the outside of the fx function declaration, and the...
Scope = VO + All Parent VOs I think this represents the variable object in this function scopeChain = [[VO] + [VO1] + [VO2] + [VO nesti1]]; this represents all the variable objects in the global environment All Parent VOs. ...
Why the difference between the two is wrong in the first place? it feels like a scope, but I can t tell why. Is there a specific first ? function e (v) { console.log(w) } function a(z){ return function b(y) { return function c(x) { ...
in the part where thinkphp5 is used as the site configuration item to take effect in real time read the data in the configuration table in the app_init hook function, which can be read in all pages. My idea is to use $GLOABLS. But I see other people ...
I have just learned python and encountered some problems about the scope of variables, as follows: the following is not very clear var a = 3 const f = () => { a += 4 console.log(a) } a() 7 f() 7 in js , you can not only access gl...
Code written by colleagues function tableVue(tableData){ var tableData = tableData; * vue * var tableV = new Vue({ el: -sharptable , data: { item:[] }, mounted: function () { ...
var a= 1; function fn1(){ alert(a); a = 2; } fn1(); alert(a); output 1 first, and then output 2 I would like to ask the browser about the process of performing this, and ask for advice ...
function student () { var name = xxx ; var getName = function () { return name } var setName = function (newName) { name = newName; } return { getName: getName, setName: setName, name: na...
how do you explain the relationship between spring scope and threads? Is there any relevance? the problem is as follows: spring scope is simulated in singleton mode, so it is considered that multiple requests for the same address will be executed seq...
when Google is set to keep only local data until you exit the browser, does it mean that the persistent cookie (with expiration time, not session-level cookie) written by Google will also expire? in this way, the sessionid will be regenerated every t...
according to Wechat open platform documents, mobile applications can pull Mini Program. For more information, please see the link below . Mobile app pulls up Mini Program function < H2 > my needs < H2 > the partner is APP, and we are Mini Program...
the following is the code I wrote when I was learning, but as soon as I ran the button event in the web page JS, it ran automatically. I don t know where I made a mistake. I looked on Baidu and saw that the button event was written like this. Please he...
beginner to learn the algorithm, do not quite understand the concept of this block, such as a function function fn(){ for(i = 0; i < n; iPP){} } if this is the case, how to calculate the time complexity? is it O (nlogn+n), or can it no...
1. In all component trees, if VNode is a component or a slot, that contains components, then VNode must be unique. So the following two examples are wrong. how to understand this first error Chestnut: <div id= app > <ele> ...