js import and export
// helloworld.js
export function helloWorld() {
return 'Hello World!';
}
// main.js
import helloWorld from './helloworld.js';
console.log(helloWorld());js import and export
// helloworld.js
export function helloWorld() {
return 'Hello World!';
}
// main.js
import helloWorld from './helloworld.js';
console.log(helloWorld());export and export default
// Three different export styles
export foo;
export default foo;
export = foo;
// The three matching import styles
import {foo} from 'blah';
import foo from 'blah';
import * as foo from 'blah';export default react
import React from 'react'; // get the React object from the react module
class HelloWorld extends React.Component {
render() {
return <p>Hello, world!</p>;
}
}
export default HelloWorld; // expose the HelloWorld component to other modulesexport default
/*
Since export default is used to declare a fallback value for a module or
file, you can only have one value be a default export in each module or
file. Additionally, you cannot use export default with var, let, or const.
*/
// named function
export default function add(x, y) {
return x + y;
}
// anonymous function
export default function(x, y) {
return x + y;
}import and export type in js
// Exporting individual features
export let name1, name2, …, nameN; // also var, const
export let name1 = …, name2 = …, …, nameN; // also var, const
export function functionName(){...}
export class ClassName {...}
// Export list
export { name1, name2, …, nameN };
// Renaming exports
export { variable1 as name1, variable2 as name2, …, nameN };
// Exporting destructured assignments with renaming
export const { name1, name2: bar } = o;
// Default exports
export default expression;
export default function (…) { … } // also class, function*
export default function name1(…) { … } // also class, function*
export { name1 as default, … };
// Aggregating modules
export * from …; // does not set the default export
export * as name1 from …; // Draft ECMAScript® 2O21
export { name1, name2, …, nameN } from …;
export { import1 as name1, import2 as name2, …, nameN } from …;
export { default } from …;export default
// Default exports
export default expression;
export default function (…) { … } // also class, function*
export default function name1(…) { … } // also class, function*
export { name1 as default, … };Copyright © 2021 Codeinu
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