JavaScript 的当前版本是 ECMAScript 5;ECMAScript 6 目前正在开发中。 影响和语言的性质 JavaScript 的创造者 Brendan Eich 别无选择,只能很快地创建这种语言(否则,Netscape 可能会采用其他更糟糕的技术)。他从几种编程语言中借鉴了一些东西:Java(语法,原始值与对象),Scheme 和 AWK(一级函数),Self(原型继承),以及...
19.16 Enforce spacing inside of computed property brackets. eslint: computed-property-spacing // bad obj[foo ] obj[ 'foo'] const x = {[ b ]: a} obj[foo[ bar ]] // good obj[foo] obj['foo'] const x = { [b]: a } obj[foo[bar]]...
eslint: object-curly-spacing jscs: requireSpacesInsideObjectBrackets // bad const foo = {clark: 'kent'}; // good const foo = { clark: 'kent' }; 18.12 避免一行代码超过100个字符(包含空格)。 注意: 对于上面——strings--line-length,长字符串不受此规则限制,不应分解。 eslint: max-len ...
css-in-javascript Add linting for Markdown prose 8年前 linters Add linting for Markdown prose 8年前 packages [eslint config] [*] [docs] Specify yarn-specific install instructions 8年前 react Updated "how to define propTypes..." 8年前 .editorconfig Add editorconfig 9年...
Here the trick is to look at the second set of square brackets; +[] creates a zero inside an object accessor. So, from the right it looks like [+[]]; then, farther left a new array is created with [], so you are looking for a “0” inside a blank array which returns ...
Missing punctuation. As mentioned earlier, JavaScript programming often involves lots of symbol pairs like opening and closing parentheses and brackets. For example, if you typealert(‘hellO’;—leaving off the closing parenthesis—you’ll probably get the:“Unexpected token;” message, meaning that ...
import { foo } from 'es6-foo'; let test = foo() === true ? 'Pass' : 'Fail'; console.log(test, 'foo() should import and return true.'); In both cases, you can include multiple variables inside the import/export brackets, but I recommend that you try to export one thing from...
}2. We can no longer call closureScope() afterwards as it has no name... so instead we'll wrap our function definition in brackets... remember that the function keyword returns a defined function... so we will then invoke it using the standard "()" parentheses;(function () {...
To get theIdfrom any record in the application, open that record and use theCopy a Linkcommand. Paste the link into Notepad and isolate the portion that contains theidparameter value excluding the encoded brackets (“%7b” = “{”) and (“%7d” = “}”). For example, the following ...
With arrow functions, we don't have to write curly brackets if we just return one value. However, if you want to instantly return an object from an arrow function, you have to write it between parentheses, otherwise everything between the two braces will be interpreted as a block statement...