javascript closure interview question

functionality that can be called by an EXE.5. what is strong type and weak type? which is good, why? What is strong-typing versus weak-typing? Which is preferred? Why?Strong-typing refers to checking the type of variables as early as possible, usually at compile time. Week-typing refers to checking the variable type as far back as possible, usually at run time. Which is good? In fact, each has a good, like Ruby, JavaScript, belong to Week-typing, the

# Closed Bag #My understanding: In the interview, first say the scope chain, and then the cause of the closure, then garbage collection GC, finally said closures.A. A variable declared inside a function is its private variable.B. In JavaScript attributes, a function is a variable that can access all the variables in its scope chain.C. But outside the function, pr

25 JavaScript interview questions you need to know 1. Usetypeof bar === "object"JudgmentbarIs an object having potential drawbacks? How can we avoid such disadvantages? UsetypeofThe disadvantage is obvious.instanceof): let obj = {};let arr = [];console.log(typeof obj === 'object'); //trueconsole.log(typeof arr === 'object'); //trueconsole.log(typeof null === 'object'); //true According to the output,type

Today, I saw a javascript question, which cyclically binds events according to common sense, but the result is not what I wanted.Copy codeThe Code is as follows: 1. The I displayed in the click link of this Code is-1. Why?Simply put, it is the scope of function variables. If function () {alert (I); return false;} is treated as a function a (); a (), internal variable I is not defined, but it is used interna

Mingyuan interview. The written examination questions are as follows: I. SQL test questions 1 has two tables Based on the given SQL statement, what are the number of rows returned? For visual display, I gave the SQL statement execution results. A student table B Score Table New question Select a. * from a inner join B on a. id = B. id; Select a. * from a, B where a. id = B. id Select a. * from a left joi

DOCTYPE HTML>HTML> Head> MetaCharSet= "{CHARSET}"> title>title> Head> Scripttype= "Text/javascript" /> functionChkform ( This) { varvalue=Thist.d1.value; varLen=value.length; for(varI=0; ILen;i++){ if(Value.charat (i)>"9" ||Value.charat (i)"0") {alert ("contains non-numeric characters"); return false; } } return true; } Script> Body>

Beginners often encounter, that is, get the HTML element collection, loop to add events to the element. The corresponding index is obtained in the event response function (handler). But each fetch is the index of the last loop. The reason is that beginners do not understand the characteristics of JavaScript closures.A netizen asked a question, such as the next HTML, why click All the paragraph p output is 5

Xiaomi company JavaScript interview questions, Xiaomi javascript Interview Questions I, Copy codeThe Code is as follows:Define such a functionFunction repeat (func, times, wait ){}This function can return a new function, for exampleVar repeatedFun = repeat (alert, 10,500 0)Call this repeatedFun ("hellworld ")Alert ten

This article mainly introduces the personal solutions for Xiaomi's JavaScript interview questions. For more information, see the following interview questions. I, The Code is as follows: Define such a functionFunction repeat (func, times, wait ){}This function can return a new function, for exampleVar repeatedFun = repeat (alert, 10,500 0)Call this repeatedFun

write-only, and some6, how do you make sure that you do not traverse the properties of the prototype when using the For In loop object?Recommendation: Use the hasOwnProperty method to determine7,json formatted data, what is the case error prone?Suggestion: This question I did not answer out, just checked the information, should be the problem of anti-slash, refer to this information: http://www.cnblogs.com/lengyuhong/archive/2012/01/07/2262390.html8,

David Posin helps you land this next programming position by understanding important JavaScript fundamentals.JavaScript is a fun, powerful, and important language with a low barrier of entry. People from all kinds of backgrounds and careers find themselves choosing to wrestle with the chaos, is JavaScript Pro Gramming. With such a varied set of backgrounds, does everyone has the same broad knowledge of

developer's knowledge about JavaScript inheritance and prototype attributes.Question 3: HoistingWhat is the output result of the following code?Function test (){Console. log ();Console. log (foo ());Var a = 1;Function foo (){Return2; } }Test (); answerUndefined and 2.The above code is equivalent to the following code:Function test (){Var;Function foo (){Return2; }Console. log ();Console. log (foo ());A = 1; }Test ();

Why do you say that, if you receive an interview invitation a few days ago, you can try it. You haven't had an interview for a few years. And interviewer This article aims to allow more programmers to understand some concepts of javascript. We already know enough about it. It's time to move closer to the deeper understanding. Why do you say that, if you receive

JavaScript Interview Requirements: the following questions must be selected from one to four, three questions are implemented using native code, and no framework is available. The fifth question is chosen as the JavaScript Interview Requirements: the following questions must

JavaScript is not only a low threshold, but also an interesting, powerful and very important language. People from all walks of life find their most confusing choice is the Javasscript programming language. Because of the variety of backgrounds, not everyone has a broad understanding of JavaScript and its rationale. Usually carcass, unless you go to a job interview