ecma6

Since went to Baidu for a long time did not update the blog, read the previous written east, before the small company or relatively idle AH. The irony is this time to change jobs to small companies, just remember to write a blog ...After going to Baidu to learn Python, and then the front of GG gone, I do not want to use Python, the full effort to switch to Nodejs.More and more like the JS family, recently looked at the new features of ECMA6, and indee

New javascript features: let, function *, yield, promise I haven't updated my blog for a long time since I went to Baidu. I read the stuff I wrote before. I used to be idle in small companies. The irony is that this time I want to change my job to a small company, I think of writing blogs... I learned python first after I went to Baidu, and then GG went away. I didn't want to use python anymore, so I tried my best to switch to nodejs. I like the JS family more and more. I recently read the new f

Firefox, the 6th line of code function g is declared inside the block.ECMAScript 5, the current official specification of the JavaScript language, does no define the behavior for function Dec Larations inside blocks.Functiondeclarations is only allowed to appear on program or Functionbody. Syntactically, they can not be appear in Block ({...})-such as that, if, and for statements. This was because Blocks can only contain statements, not sourceelements, which functiondeclaration is. If we look a

Encountered in the interview, ask JS how to achieve inheritance, in fact, the best way is the constructor + prototype, today in the discussion, found that their previous understanding of some of the misunderstandings, specifically written out, recently are relatively busy, etc. hand on the project done, you can do a summary.First of all, I didn't know the place before.1 __proto__ This is not a standard implementation, but the major browsers and node have adopted,

jquery vs. VueForeword: Many people say Jquey and vue nothing comparable, should and angular,react to compare, I think they are not much comparable, are based on the idea of MVVM design framework, is not the same way of implementation, in different scenarios, there will be some differences in performance. But the shift from jquery to Vue, or to MVVM, is a thought-out shift from the original idea of direct manipulation of the DOM to operational data, isn't it a fundamental change?1.jquery Introdu

function g is in the block. ECMAScript 5, the current official specification of the JavaScript language, does not define the behavior for function declarations inside blocks.FunctionDeclarations are only allowed to appear in Program or FunctionBody. syntactically, they can not appear in Block ({...}) -such as that of if, while or for statements. this is because Blocks can only contain Statements, not SourceElements, which FunctionDeclaration is. if we look at production rules carefully, we can

JavaScript language is that it allows "dynamic binding", that is, which object the properties and methods belong to, not determined at compile time, but at runtime.Strict mode has some restrictions on dynamic binding. In some cases, only static bindings are allowed . That is, the property and method belong to which object, which is determined at the compile stage. This facilitates compilation efficiency and makes the code easier to read and less unexpected.Specifically reflected in:(1) Prohibit

a promise function chain. Simple and elegant code organization, good anomaly capture mechanism are the advantages of promise. One problem with promise, though, is that if a module is written in promise, almost any other module associated with it will have to be replaced by the Promise form. KOA. KOA actively embrace the ECMA6 standard, its use of CO module implementation, synchronous code to express the asynchronous feelings! KOA need to rewrite

, and the target language is JavaScript, in our When writing typescript you can use JavaScript, in my opinion the compiler big deal does not compile that piece of JavaScript code, right! So we write typescript in fact can write ECMASCRIPT6, the reason is very simple you will use TSC to compile, then you imagine you write typescript is to use ECMA6 standard to compile, OK? Now do you think they're a thing? If you don't understand, I can only get into t

null, that is, its literal. (for example, number literal can be any digit between 1-9)Null is used to represent an object that does not already exist (this is briefly described when discussing the typeof operator).Null is nothing, for example, space, empty string, 0, etc. are objects with actual values, and null of course there is a qualitative difference.Console.log (typeofnull// Print Object/* from a logical point of view, a null value represents an empty object pointer . This is why the

If you want to swap the values of two variables, you do not want to use the intermediate quantity. I used the method to process the arguments attribute of the function. Function Exchange (a, B) {var ARGs = arguments; ARGs = []. slice. call (ARGs ). reverse (); A = ARGs [0], B = ARGs [1]; console. log (a + ''+ B); // 10, 1}; Exchange (1, 10 ); If Firefox supports the ecma6 syntax, the browser can also be shorter, and the Structure assignment can be

1.jquery: This once is still the most popular web front-end JS library, but now whether domestic or foreign his utilization rate is gradually replaced by other JS libraries, with the browser vendors to HTML5 compliance and ECMA6 in the browser side of the implementation, The usage of jquery will be getting lower2.vue: Is a rising front-end JS library that is a streamlined mvvm. Technically speaking, Vue.js focuses on the ViewModel layer of the MVVM mo