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This article mainly shares 25 JavaScript interview questions that we need to know. If you want to pass the interview, refer
1. use typeof bar === "object" to determine if bar is an object with potential drawbacks? How can we avoid such disadvantages?
The disadvantage of using typeof is obvious (this disadvantage is th
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
Xiaomi company JavaScript interview questions, Xiaomi javascript
Interview Questions
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Copy codeThe Code is as follows:Define such a functionFunction repeat (func, times, wait ){}This function can return a new function, for examp
JavaScript is the official language of all modern browsers. As a result, JavaScript problems are encountered in all language developers ' interviews.This article does not talk about the latest JavaScript libraries, general development practices, or any new ES6 functions. Instead, talk about the 3 JavaScript problems th
object. Conversely, when Getfullname () is assigned to the test variable, the context refers to the Global Object (window). This is because test is a property that is implicitly set to the global object. For this reason, the function returns the FullName of the window, that is, the value defined in the first row. Question 5:call () and apply ()Now let you solve the previous problem and make the final Console.log () print Aurelio De Rosa. Answer The problem can change the function context by fo
The demand for JavaScript programmers in the IT world is huge. If you are very proficient in JavaScript, you will have a lot of opportunities to change jobs and raise salaries. But before a company hires you, you have to pass the interview and prove your skills. In this article, I'll show you 5 JavaScript-related
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
first line of the code snippet in this case.Question 5: call () and apply ()
Fix the previous issue and print Aurelio De Rosa from the last console. log.Answer
You can use the call () or apply () function to force the context of the function. If you do not know the difference between call () and apply (), I recommend that you read the article function. call and function. apply. Is there a difference between them? . In the following code, I will use call (), but in this case, apply () can also g
first line of the code snippet in this case.Question 5: call () and apply ()
Fix the previous issue and print Aurelio De Rosa from the last console. log.Answer
You can use the call () or apply () function to force the context of the function. If you do not know the difference between call () and apply (), I recommend that you read the article function. call and function. apply. Is there a difference between them? . In the following code, I will use call (), but in this case, apply () can also g
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 === 'o
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
nested, must have root element, all XHTML elements must be nested within the root element5, to the Web standardization (or site reconstruction) know what the relevant knowledge, briefly describe a few of the Web standards you know? Web standardization is divided into structural standardization, performance standardization, behavior standardization. The structure standard language has XHTML and XML, the performance standard language CSS, the behavior standard language w3c,ecmscriptWeb standardi
configuration. While JavaScript is interpreted to perform without generating intermediate files, "read a sentence, execute a sentence", the execution can generally be done in three ways:1. The general browser comes with the JS interpreter, which can be used directly by the browser;2. Special interpreter software can be installed node. js, executing the. js file;3. Executed with the Web page, using the Third, the data typeJava is a strongly typed lang
Java, which meansThird-party applications developed by the SDK must use the Java language. However, this is not equivalent to "third-party applications can onlyUse Java ". At the first release of the Android SDK, Google claimed that its virtual machine Dalvik supported JNI programming.Method, that is, third-party applications can call their own C dynamic library through JNI, that is, on the Android platform,The "Java + C" programming method can always be implemented.Of course, the root cause of
. Conversely, when Getfullname () is assigned to the test variable, the context refers to the Global Object (window). This is because test is a property that is implicitly set to the global object. For this reason, the function returns the FullName of the window, that is, the value defined in the first row.Question 5:call () and apply ()Now let you solve the previous problem and make the final Console.log () print Aurelio De Rosa. ReplyThe problem can change the function context by forcing the
JavaScript Interview Requirements: the following questions must be selected from one to four, three questions, implemented using native code, cannot be usedIn any framework, the fifth question is selected.1. display images in a fixed area of the page1. Each time you click the right arrow, the image area will scroll to
are not placed under the sub-domain name, but placed in a separate primary domain name. There is also a reason that the browser for a domain name will have a limit on the number of requests, this method can be convenient to do CDN.What are the states of the readystate of 23.ajax, and what are the meanings respectively?Ajax readystate A total of 5 states, respectively, 0-4, each of which means that the meaning of each number is 0 is not called the Open method, 1 means that the Send method is not
Questions about function call variables
var a =10; function aaa(){ alert(a); } function bbb(){ var20; //10 } bbb();
Variable declaration issues
function aaa(){ var a=b=10; } aaa(); alert(a);//not defined alert(b);//10
Variable lookup is the nearest principle to find, Var defined variables, when the nearest is not found, will look for the outer layer:
var10 funct
1.----------------------------------------------------var function () {this. Name = ' Peter '; return ' Jack '}; var New Fun ();Excuse me, p.name is:A: ' Peter ', B: ' Jack ', C:null, d:undefined2.----------------------------------------------------var function () {this. Name = ' Peter '; return ' Jack '; var New Fun ();Excuse me, p.name is:A: ' Peter ', B: ' Jack ', C:null, d:undefined3.----------------------------------------------------var function =' peter '}}varnew fun (); var New =
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