**`split()`** 方法使用指定的分隔符字符串将一个[`String`](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/String)对象分割成子字符串数组,以一个指定的分割字串来决定每个拆分的位置。```jsconst str = 'The quick brown fox jumps over the lazy dog.';const words = str.split(' ');console.log(words);//Array ["The", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog."]const chars = str.split('');console.log(chars);// ["T", "h", "e", " ", "q", "u", "i", "c", "k", " ", "b", "r"......const strCopy = str.split();console.log(strCopy);// expected output: Array ["The quick brown fox jumps over the lazy dog."]```**适用于字符串转为数组**