ecmascript-5

问题 I've tried the babel transpiler, and it converts All let, const and var to just var, so in all, what's the difference in our code usage? I have read documents and I know what's the difference between let, const and var , but if all of them are eventually converted to var , what's the difference ? it means that there shouldn't be any meaningful differences in performance or even scope! Update (02.14.2019) : Based on the answers I understood that scope does matter and even though they are

问题 I made a library and it needs to support multiple applications. However one of the sites is non-angular and will not support "modules", hence I am unable to use "export" on my function. My External library: var foo = (function() { function MyFunction(){ } MyFunciton.prototype.bar(){ } return MyFunction; }()); My Question: How do I import this into my component.ts without an export? 回答1: Include your script in your angular.json file in the scripts section. "architect": { "build": { "builder":

问题 I need to repeat async/await block several times, but cannot use the following code: for (let i = 0; i <= 10; i += 1) { const res = await DoSomething(); } because it contradicts with no-await-in-loop rule. 回答1: Use Promise.all if order of iteration doesn't matter If you don't mind code running out-of-order (meaning order of each iteration doesn't matter), just use Promise.all instead: const promises = []; for (let i = 0; i <= 10; i += 1) { promises.push(DoSomething()); } const responses =

问题 Could someone please help me to extract the text between the : and the ^ symbols using a JavaScript (ECMAScript) regular expression in C++11. I do not need to capture the hw-descriptor itself - but it does have to be present in the line in order for the rest of the line to be considered for a match. Also the :p....^ , :m....^ and :u....^ can arrive in any order and there has to be at least 1 present. I tried using the following regular expression: static const std::regex gRegex("(?:hw

问题 Could someone please help me to extract the text between the : and the ^ symbols using a JavaScript (ECMAScript) regular expression in C++11. I do not need to capture the hw-descriptor itself - but it does have to be present in the line in order for the rest of the line to be considered for a match. Also the :p....^ , :m....^ and :u....^ can arrive in any order and there has to be at least 1 present. I tried using the following regular expression: static const std::regex gRegex("(?:hw

问题 Could someone please help me to extract the text between the : and the ^ symbols using a JavaScript (ECMAScript) regular expression in C++11. I do not need to capture the hw-descriptor itself - but it does have to be present in the line in order for the rest of the line to be considered for a match. Also the :p....^ , :m....^ and :u....^ can arrive in any order and there has to be at least 1 present. I tried using the following regular expression: static const std::regex gRegex("(?:hw

问题 Long Question To start, I know ECMA Script is the standard, and JavaScript and JScript are implementations. I understand that all three have their own specifications maintained, and there are many, many engines, interpreters, and implementations, but my specific question is: Assuming the implementation of a perfect interpreter and engine for each of the three, what could you do in one that you could not do in another, or what would have different effects in one than the other two? I

问题 The following is the code that works best for displaying custom errors in Chrome Devtools, Node.js, etc. Based on this StackOverflow answer. function CustomErr (message) { var err = new Error(message) Object.setPrototypeOf(err, CustomErr.prototype) return err } CustomErr.prototype = Object.create(Error.prototype, { name: { value: 'Custom Error', enumerable: false } }) However, when I convert it to Typescript: function CustomErr (message: string) { var err = new Error(message) Object

问题 The following is the code that works best for displaying custom errors in Chrome Devtools, Node.js, etc. Based on this StackOverflow answer. function CustomErr (message) { var err = new Error(message) Object.setPrototypeOf(err, CustomErr.prototype) return err } CustomErr.prototype = Object.create(Error.prototype, { name: { value: 'Custom Error', enumerable: false } }) However, when I convert it to Typescript: function CustomErr (message: string) { var err = new Error(message) Object

来源： https://stackoverflow.com/questions/39899332/check-date-against-an-array-of-dates