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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/String/toLowerCase below:

String.prototype.toLowerCase() - JavaScript | MDN

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String 的 toLowerCase() 方法将该字符串转换为小写形式。

const sentence = "The quick brown fox jumps over the lazy dog.";

console.log(sentence.toLowerCase());
// Expected output: "the quick brown fox jumps over the lazy dog."

一个新的字符串，表示转换为小写的调用字符串。

toLowerCase() 方法返回将字符串转换为小写形式后的值。toLowerCase() 不会影响字符串 str 本身的值。

console.log("ALPHABET".toLowerCase()); // 'alphabet'

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