What does ${} (dollar sign and curly braces) mean in a string in Javascript?

问题

I haven't seen anything here or on MDN. I'm sure I'm just missing something. There's got to be some documentation on this somewhere?

Functionally, it looks like it allows you to nest a variable inside a string without doing concatenation using the + operator. I'm looking for documentation on this feature.

Example:

var string = 'this is a string';

console.log(`Insert a string here: ${string}`);

回答1:

You're talking about template literals.

They allow for both multiline strings and string interpolation.

Multiline strings:

console.log(`foo
bar`);
// foo
// bar

String interpolation:

var foo = 'bar';
console.log(`Let's meet at the ${foo}`);
// Let's meet at the bar

回答2:

As mentioned in a comment above, you can have expressions within the template strings/literals. Example:

const one = 1;
const two = 2;
const result = `One add two is ${one + two}`;
console.log(result); // output: One add two is 3

来源：https://stackoverflow.com/questions/35835362/what-does-dollar-sign-and-curly-braces-mean-in-a-string-in-javascript