javascript es6 class

, top, bottom}; = ProcessInput (input);5.StringsUse template strings instead of string links when programmatically generating stringsfunction Sayhi (name) { return ' How is You, ${name}? `;}6. FunctionsUsing function declarations instead of function expressionsfunction foo () {}The function expression that is called immediately:() = { console.log (' Welcome to the Internet. Please follow me. ' );}) ();Never declare a function in a non-function code block (if,while) and assign that

]) {...} f ([1, 2, 3]); // parameter is a set of no-order values function 3, Y:2, x:1});Extracting JSON datavar = {jsondata, "OK", data: [867, 5309 = Jsondata;console.log (ID, status, number); // "OK", [867, 5309]Default values for function parametersfunction (URL, { true, function () {}, true, function () {}, false, true, // ... more config}) { // ... do stuff};Traverse the map structurevar New Map (); Map.set (' first ', ' Hello '); Map.set (' second ', ' World ') ; for (Let

I believe many people have used export, export default, import, but what is the difference between them?In JavaScript ES6, export and export default can be used for exporting constants, functions, files, modules, etc., which you can import in other files or modules in such a way that they can be import+(常量 | 函数 | 文件 | 模块)名 used, but in a file or module, Export, import can have multiple, export default only

In the spirit of sharing the Internet, I will share my understanding of promise to you.The Promise method of JavaScript ES6 is mainly applied to the result of handling the return of an asynchronous function, noting that he is not converting an asynchronous function to a synchronous function, but when the asynchronous function has the result when the corresponding method is called to process.Promise has the

JavaScript modularity is a large and easily confusing topic. Almost all third-party libraries support the Cmd,amd,es6,global object approach to referencing the services that Lib exposes.So what if we want to write a lib ourselves, and as a module can be freely referenced by other modules?First of all, we need to figure out how we should export the service of the module we want to write, what are the ways?In

I believe many people have used export, export default, import, but what is the difference between them?In JavaScript ES6, exportand export default can be used for exporting constants, functions, files, modules, etc., which you can import+(常量 | 函数 | 文件 | 模块)名 import in other files or modules, In order to be able to use it, but in a file or module, export, import can have multiple,export default only one .S

Function* Gen () { yield 1; Yield 2; Yield 3; } var g = gen (); G.next (); {value:1, done:false} g.return ("foo");//{value: "foo", Done:true} Note If the done value is true and then call return, the value returned is also undefined Function* Gen () {yield 1;} var g = gen (); Console.log (G.next ());//{value:1, Done:false} Console.log (G.next ());//{value:undefined, Done:true} 2.5 Generator.prototype.throw () Thorw () method, by throwing an exception into the iterat

be said that these two methods are the extension of includes method; Let str= ' Google '; Console.log (Str.startswith (' G ')); True Repeat the Lazy man welfare As the name suggests, this method is to get the string repeated n times after the method; Let str= ' Google '; Console.log (Str.repeat (3)); Googlegooglegoogle The Repeat method accepts an argument of a numeric type, which can be either formal or decimal, and if it is a floating-point type, it automatically i

ES6 can use the arrows to define a function, note that it is a function, and do not define a class (constructor) in this way. => First, the grammar 1. Simple function with one parameter var single = a => a ("Hello, World")//' Hello, World ' 2. No parameters need to be used before the arrow plus parentheses var log = () => { alert (' no param ') } 3. Multiple parameters need to u

What is a deconstruction assignment? The deconstruction assignment allows you to assign array and object property values to a series of variables using syntax such as array or object literal. This syntax is very concise and more explicit than traditional attribute access. Access the first three items of the array without using the destructor assignment: var-i = somearray[0]; var second = somearray[1]; var third = somearray[2]; var-i = somearray[0]; var second = somearray[1]; var thir

ES5 object property names are strings, which can easily cause property names to conflict. For example, if you use an object provided by another person but want to add a new method to the object (mixin mode), the name of the new method may conflict with the existing method. If there is a mechanism to ensure that the names of each attribute are unique, this will fundamentally prevent the conflict of property names. This is why ES6 introduced Symbol.

Before object.is, we compare values using the two equal sign "= =" or the three equal sign "= =", the three equals is more rigorous, as long as the comparison of the two types of different immediately return false. In addition, there is and only one value is not equal to itself, it is Nan Now ES6 added a object.is, let comparison operation of the river is more chaotic. In most cases object.is is equivalent to "= =", as follows 1 = = 1//Tru

function* statement The function* declaration (the Function keyword followed by an asterisk) defines a generator (generator) function that returns a generator object.A generator is a function that you can exit from and then re-enter. The environment of the generator (the bound variable) is saved after each execution and continues to be used the next time it is entered.Invoking a generator function does not immediately execute its body, but instead returns an iterator (iterator) object for t