问题
This question already has an answer here:
- Usage of the backtick character (`) in JavaScript? 7 answers
Recently ran into some JS code that uses ` and '. I can't figure out if there is a different use for each apostrophe. Is there any?
回答1:
' or " denote a string and ` denotes a template string. Template strings have some abilities that normal strings do not. Most importantly, you get interpolation:
var value = 123;
console.log('test ${value}') //=> test ${value}
console.log(`test ${value}`) //=> test 123
And multiline strings:
console.log('test
test')
// Syntax error
console.log(`test
test`)
// test
// test
They have some other tricks too, more on template strings here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/template_strings
Note they are not supported in all javascript engines at the moment. Which is why template strings are often used with a transpiler like Babel. which converts the code to something that will work in any JS interpreter.
来源：https://stackoverflow.com/questions/33679732/difference-if-there-is-any-between-and-in-javascript