How can i use ES6 syntax such as let in chrome con

问题:

This question already has answers here:

Using ECMAScript 6 (5 answers)

Closed 4 years ago.

I am trying to write some ES6 code in chrome console but i ran with some errors. How can i run the ES6 scripts in console?

For example, given the input

let type='grizzle';

the console records a SyntaxError with the message

Block-scoped declarations (let, const, function, class) not yet supported outside strict mode

as shown in the following screenshot

回答1:

UPDATE: As of late 2019, you can just use let in the console.

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As the error message states, some ES6 features are not available outside of strict mode. Therefore, to take advantage of those features, you must first create a strict-mode block.

From the console, the easiest way to use strict mode is by creating an Immediately-Invoked Function Expression (IIFE). For example,

(function() { "use strict"; let x = "asdf"; }());

will behave as intended when entered in the console.