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let originalString = "Hello, World!";  
let mixedCaseString = originalString.toUpperCase().toLowerCase(); // ʵ¼ÊÉÏÊǶàÓàµÄ£¬ÒòΪ½á¹ûºÍԭʼ×Ö·û´®µÄСдÐÎʽÏàͬ  
console.log(mixedCaseString); // Êä³ö: hello, world!  

// Ìõ¼þת»»Ê¾Àý  
function toggleCase(str) {  
    return str === str.toUpperCase() ? str.toLowerCase() : str.toUpperCase();  
}  

printl(toggleCase("HELLO")); // Êä³ö: hello  
printl(toggleCase("hello")); // Êä³ö: HELLO

¶¨ÒåÁËÒ»¸öԭʼ×Ö·û´®originalString£¬ÆäֵΪ"Hello, World!"¡£

È»ºó£¬´´½¨ÁËÁíÒ»¸ö±äÁ¿mixedCaseString£¬Ëüͨ¹ý½«originalStringת»»Îª´óдºóÔÙת»»ÎªÐ¡Ð´À´¸³Öµ¡£Êµ¼ÊÉÏ£¬Õâ¶Î´úÂëÖеÄtoUpperCase().toLowerCase()ÊǶàÓàµÄ£¬ÒòΪһ¸ö×Ö·û´®ÏÈת»»Îª´óдÔÙת»»ÎªÐ¡Ð´£¬½á¹û×ÜÊǸÃ×Ö·û´®µÄСдÐÎʽ¡£Òò´Ë£¬mixedCaseStringµÄÖµÓëoriginalStringµÄСдÐÎʽÏàͬ£¬¼´"hello, world!"¡£×îºó£¬Ê¹ÓÃconsole.logÊä³öÁËmixedCaseStringµÄÖµ¡£

½ÓÏÂÀ´µÄ´úÂ붨ÒåÁËÒ»¸öº¯ÊýtoggleCase£¬ÓÃÓÚÇл»×Ö·û´®ÖÐ×Ö·ûµÄ´óСд¡£º¯Êý½ÓÊÜÒ»¸ö×Ö·û´®²ÎÊýstr£¬²¢¼ì²é¸Ã×Ö·û´®ÊÇ·ñµÈÓÚÆä´óдÐÎʽ¡£Èç¹ûÊÇ£¬Ôò·µ»Ø¸Ã×Ö·û´®µÄСдÐÎʽ£»Èç¹û²»ÊÇ£¬Ôò·µ»Ø¸Ã×Ö·û´®µÄ´óдÐÎʽ¡£

×îºó£¬µ÷ÓÃÁËtoggleCaseº¯ÊýÁ½´Î£¬·Ö±ð´«ÈëÈ«´óдµÄ"HELLO"ºÍȫСдµÄ"hello"£¬²¢³¢ÊÔʹÓÃprintlÊä³ö½á¹û¡£µ«ÊÇ×¢Ò⣬ÔÚJavaScriptÖУ¬ÕýÈ·µÄÊä³öº¯ÊýÓ¦¸ÃÊÇconsole.log¶ø²»ÊÇprintl£¬Òò´ËÕýÈ·µÄµ÷Ó÷½Ê½Ó¦¸ÃÊÇ£º

// ʾÀý×Ö·û´®
let exampleString = "Hello, World! This is a Test. Let's see: how it works; now.";

// º¯Êý£ºÇл»Ã¿¸öµ¥´ÊµÄ´óСд
function toggleWordCase(str) {
    // ʹÓÃÕýÔò±í´ïʽƥÅäÿ¸öµ¥´Ê
    return str.replace(/\b([a-zA-Z]+)\b/g, function(match) {
        // Èç¹ûÕû¸öµ¥´ÊÊÇ´óдµÄ£¬Ôòת»»ÎªÐ¡Ð´
        if (match === match.toUpperCase()) {
            return match.toLowerCase();
        } else {
            // ·ñÔò£¬½«µ¥´Êת»»Îª´óд
            return match.toUpperCase();
        }
    });
}

// Êä³ö½á¹û
console.log(toggleWordCase(exampleString)); 
// Êä³ö: "hELLO, wORLD! tHIS iS A tEST. lET'S sEE: hOW iT wORKS; nOW."

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