react js interview questions

The interview question is a topic of great interest to both the company and the developer, and the company wants to know the real level of the developer and the details of the process, and the developer wants to be able to show the best possible level (or even paranormal). This article provides a number of front-end development interview questions, whether the re

There are 100 steps, can be 1 steps across 2 steps, then a number of ways to go; Telephone interview today. Encountered an algorithm problem, and then an instant face Meng force; Then wit me, think smart of the thought if a person every time walk 1 steps, then the most steps, 2 steps at least step, and then obviously digress ... Fortunately, the other party in time to interrupt me ... or I guess I'm going to die on this thing . Go all the way to t

Most people will do wrong questions about the classic JS Closure Interview Questions evolved from work This is a problem I encountered at work. It seems very interesting. I went to the interview as a question and found that almost no one could answer all the correct

'); Alert (typeof om = = ' undefined '); 2. JS does not have a block scope, the variables declared in the function are available throughout the function (whether at the beginning of the function declaration or at the end), such as JS Code function () { alert (OM); Show undefined var om = ' abc '; alert (OM); Show ABC } 3. JS declares the variable

Html5+js Test Questions==============================================1. Talk about your understanding of JS closures:　　Closures are a relatively abstract concept, especially for JS novices. The explanation in the book is rather obscure, and it is the same for me.But he is also the ability to improve the

The following are compiled online JS interview questions, the answer is for reference only./2, intercept the string ABCDEFG EFGAlert (' ABCDEFG '. SUBSTRING (4));3, judge the most frequently occurring characters in a string, count this number/*var str = ' ASDFSSAAASASASASAA ';var json = {};for (var i = 0; i if (!json[str.charat (i)]) {Json[str.charat (i)] = 1;}el

Interview questions:function fn (A, b) {Console.log (this);Console.log (a);Console.log (A+B);}Fn.call (1);Fn.call.call (FN);Fn.call.call.call (fn,1,2);Fn.call.call.call.call (fn,1,2,3);Answer:Fn.call (1); 1,undefined,nanFn.call.call (FN); Fn,undefined,nanFn.call.call.call (fn,1,2); 1,2,nanFn.call.call.call.call (fn,1,2,3); 1,2,5Deep Problem Solving Ideas:Fn.call (1); The first parameter of call changes the keyword in the function in the call before th