parseFloat()里面的forEach()不起作用

Question

任何人都可以帮助我理解为什么这段代码不起作用？不知道我哪里出错了.

let ratings = ["8.8", "8.6", "9.0", "8.3"];

ratings.forEach(rating => {
return parseFloat(rating)}
);

我只是未定义.

Answer 1

您的程序无效,因为您forEach()没有将结果存储在任何地方.在这种情况下使用Array.map()会更好 :

:

let ratings = ["8.8", "8.6", "9.0", "8.3"];

ratings = ratings.map(a=> parseFloat(a));

console.log(ratings);