{"id":2033,"date":"2025-02-25T22:38:54","date_gmt":"2025-02-25T14:38:54","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2033"},"modified":"2025-02-25T22:38:54","modified_gmt":"2025-02-25T14:38:54","slug":"javascript-%e8%bf%90%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/02\/25\/javascript-%e8%bf%90%e7%ae%97%e7%ac%a6\/","title":{"rendered":"JavaScript\u00a0\u8fd0\u7b97\u7b26"},"content":{"rendered":"\n

JavaScript \u8fd0\u7b97\u7b26\uff08Operators\uff09<\/strong> \u662f\u7528\u4e8e\u6267\u884c\u64cd\u4f5c\u7684\u7b26\u53f7\uff0c\u53ef\u4ee5\u7528\u4e8e\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\uff08\u5982\u6570\u5b57\u3001\u5b57\u7b26\u4e32\u3001\u5e03\u5c14\u503c\u7b49\uff09\u3002JavaScript \u63d0\u4f9b\u4e86\u591a\u79cd\u8fd0\u7b97\u7b26\uff0c\u7528\u4e8e\u5904\u7406\u6570\u636e\u5e76\u8fd4\u56de\u7ed3\u679c\u3002\u8fd0\u7b97\u7b26\u53ef\u4ee5\u5206\u4e3a\u591a\u79cd\u7c7b\u578b\uff0c\u4ee5\u4e0b\u662f\u6700\u5e38\u89c1\u7684\u51e0\u7c7b\uff1a<\/p>\n\n\n\n

1. \u7b97\u672f\u8fd0\u7b97\u7b26\uff08Arithmetic Operators\uff09<\/strong><\/h3>\n\n\n\n

\u7528\u4e8e\u6267\u884c\u6570\u5b66\u8fd0\u7b97\u3002<\/p>\n\n\n\n

    \n
  • \u52a0\u6cd5\uff08+<\/code>\uff09<\/strong>\uff1a\u5c06\u4e24\u4e2a\u64cd\u4f5c\u6570\u76f8\u52a0\u3002<\/li>\n\n\n\n
  • \u51cf\u6cd5\uff08-<\/code>\uff09<\/strong>\uff1a\u4ece\u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570\u4e2d\u51cf\u53bb\u7b2c\u4e8c\u4e2a\u64cd\u4f5c\u6570\u3002<\/li>\n\n\n\n
  • \u4e58\u6cd5\uff08*<\/code>\uff09<\/strong>\uff1a\u5c06\u4e24\u4e2a\u64cd\u4f5c\u6570\u76f8\u4e58\u3002<\/li>\n\n\n\n
  • \u9664\u6cd5\uff08\/<\/code>\uff09<\/strong>\uff1a\u5c06\u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570\u9664\u4ee5\u7b2c\u4e8c\u4e2a\u64cd\u4f5c\u6570\u3002<\/li>\n\n\n\n
  • \u53d6\u4f59\uff08%<\/code>\uff09<\/strong>\uff1a\u8fd4\u56de\u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570\u9664\u4ee5\u7b2c\u4e8c\u4e2a\u64cd\u4f5c\u6570\u540e\u7684\u4f59\u6570\u3002<\/li>\n\n\n\n
  • \u5e42\uff08**<\/code>\uff09<\/strong>\uff1a\u8fd4\u56de\u7b2c\u4e00\u4e2a\u64cd\u4f5c\u6570\u7684\u7b2c\u4e8c\u4e2a\u64cd\u4f5c\u6570\u6b21\u65b9\u3002<\/li>\n<\/ul>\n\n\n\n
    let x = 10, y = 5;\nconsole.log(x + y);  \/\/ \u8f93\u51fa: 15\nconsole.log(x - y);  \/\/ \u8f93\u51fa: 5\nconsole.log(x * y);  \/\/ \u8f93\u51fa: 50\nconsole.log(x \/ y);  \/\/ \u8f93\u51fa: 2\nconsole.log(x % y);  \/\/ \u8f93\u51fa: 0\nconsole.log(x ** y); \/\/ \u8f93\u51fa: 100000<\/code><\/pre>\n\n\n\n
    2. \u8d4b\u503c\u8fd0\u7b97\u7b26\uff08Assignment Operators\uff09<\/strong><\/h3>\n\n\n\n
    \u7528\u4e8e\u7ed9\u53d8\u91cf\u8d4b\u503c\u3002<\/p>\n\n\n\n
      \n
    • \u8d4b\u503c\uff08=<\/code>\uff09<\/strong>\uff1a\u5c06\u53f3\u4fa7\u7684\u503c\u8d4b\u7ed9\u5de6\u4fa7\u7684\u53d8\u91cf\u3002<\/li>\n\n\n\n
    • \u52a0\u6cd5\u8d4b\u503c\uff08+=<\/code>\uff09<\/strong>\uff1a\u5c06\u53f3\u4fa7\u7684\u503c\u52a0\u5230\u5de6\u4fa7\u7684\u53d8\u91cf\u5e76\u8d4b\u503c\u7ed9\u5de6\u4fa7\u3002<\/li>\n\n\n\n
    • \u51cf\u6cd5\u8d4b\u503c\uff08-=<\/code>\uff09<\/strong>\uff1a\u5c06\u53f3\u4fa7\u7684\u503c\u4ece\u5de6\u4fa7\u7684\u53d8\u91cf\u4e2d\u51cf\u53bb\u5e76\u8d4b\u503c\u7ed9\u5de6\u4fa7\u3002<\/li>\n\n\n\n
    • \u4e58\u6cd5\u8d4b\u503c\uff08*=<\/code>\uff09<\/strong>\uff1a\u5c06\u53f3\u4fa7\u7684\u503c\u4e58\u5230\u5de6\u4fa7\u7684\u53d8\u91cf\u5e76\u8d4b\u503c\u7ed9\u5de6\u4fa7\u3002<\/li>\n\n\n\n
    • \u9664\u6cd5\u8d4b\u503c\uff08\/=<\/code>\uff09<\/strong>\uff1a\u5c06\u5de6\u4fa7\u7684\u53d8\u91cf\u9664\u4ee5\u53f3\u4fa7\u7684\u503c\u5e76\u8d4b\u503c\u7ed9\u5de6\u4fa7\u3002<\/li>\n\n\n\n
    • \u53d6\u4f59\u8d4b\u503c\uff08%=<\/code>\uff09<\/strong>\uff1a\u5c06\u5de6\u4fa7\u7684\u53d8\u91cf\u4e0e\u53f3\u4fa7\u7684\u503c\u53d6\u4f59\u5e76\u8d4b\u503c\u7ed9\u5de6\u4fa7\u3002<\/li>\n<\/ul>\n\n\n\n
      let x = 10;\nx += 5;  \/\/ \u76f8\u5f53\u4e8e x = x + 5\nconsole.log(x);  \/\/ \u8f93\u51fa: 15\n\nx *= 2;  \/\/ \u76f8\u5f53\u4e8e x = x * 2\nconsole.log(x);  \/\/ \u8f93\u51fa: 30<\/code><\/pre>\n\n\n\n
      3. \u6bd4\u8f83\u8fd0\u7b97\u7b26\uff08Comparison Operators\uff09<\/strong><\/h3>\n\n\n\n
      \u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u503c\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\uff08true<\/code> \u6216 false<\/code>\uff09\u3002<\/p>\n\n\n\n
        \n
      • \u7b49\u4e8e\uff08==<\/code>\uff09<\/strong>\uff1a\u5224\u65ad\u4e24\u4e2a\u503c\u662f\u5426\u76f8\u7b49\uff08\u4e0d\u8003\u8651\u7c7b\u578b\uff09\u3002<\/li>\n\n\n\n
      • \u4e25\u683c\u7b49\u4e8e\uff08===<\/code>\uff09<\/strong>\uff1a\u5224\u65ad\u4e24\u4e2a\u503c\u662f\u5426\u4e25\u683c\u76f8\u7b49\uff08\u8003\u8651\u7c7b\u578b\uff09\u3002<\/li>\n\n\n\n
      • \u4e0d\u7b49\u4e8e\uff08!=<\/code>\uff09<\/strong>\uff1a\u5224\u65ad\u4e24\u4e2a\u503c\u662f\u5426\u4e0d\u76f8\u7b49\uff08\u4e0d\u8003\u8651\u7c7b\u578b\uff09\u3002<\/li>\n\n\n\n
      • \u4e25\u683c\u4e0d\u7b49\u4e8e\uff08!==<\/code>\uff09<\/strong>\uff1a\u5224\u65ad\u4e24\u4e2a\u503c\u662f\u5426\u4e25\u683c\u4e0d\u76f8\u7b49\uff08\u8003\u8651\u7c7b\u578b\uff09\u3002<\/li>\n\n\n\n
      • \u5927\u4e8e\uff08><\/code>\uff09<\/strong>\uff1a\u5224\u65ad\u5de6\u4fa7\u7684\u503c\u662f\u5426\u5927\u4e8e\u53f3\u4fa7\u7684\u503c\u3002<\/li>\n\n\n\n
      • \u5c0f\u4e8e\uff08<<\/code>\uff09<\/strong>\uff1a\u5224\u65ad\u5de6\u4fa7\u7684\u503c\u662f\u5426\u5c0f\u4e8e\u53f3\u4fa7\u7684\u503c\u3002<\/li>\n\n\n\n
      • \u5927\u4e8e\u7b49\u4e8e\uff08>=<\/code>\uff09<\/strong>\uff1a\u5224\u65ad\u5de6\u4fa7\u7684\u503c\u662f\u5426\u5927\u4e8e\u6216\u7b49\u4e8e\u53f3\u4fa7\u7684\u503c\u3002<\/li>\n\n\n\n
      • \u5c0f\u4e8e\u7b49\u4e8e\uff08<=<\/code>\uff09<\/strong>\uff1a\u5224\u65ad\u5de6\u4fa7\u7684\u503c\u662f\u5426\u5c0f\u4e8e\u6216\u7b49\u4e8e\u53f3\u4fa7\u7684\u503c\u3002<\/li>\n<\/ul>\n\n\n\n
        let x = 10, y = 5;\nconsole.log(x == y);   \/\/ \u8f93\u51fa: false\nconsole.log(x === '10'); \/\/ \u8f93\u51fa: false\nconsole.log(x != y);   \/\/ \u8f93\u51fa: true\nconsole.log(x > y);    \/\/ \u8f93\u51fa: true\nconsole.log(x <= y);   \/\/ \u8f93\u51fa: false<\/code><\/pre>\n\n\n\n
        4. \u903b\u8f91\u8fd0\u7b97\u7b26\uff08Logical Operators\uff09<\/strong><\/h3>\n\n\n\n
        \u7528\u4e8e\u8fde\u63a5\u591a\u4e2a\u6761\u4ef6\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n
          \n
        • \u4e0e\uff08&&<\/code>\uff09<\/strong>\uff1a\u53ea\u6709\u4e24\u4e2a\u64cd\u4f5c\u6570\u90fd\u4e3a true<\/code>\uff0c\u7ed3\u679c\u624d\u4e3a true<\/code>\u3002<\/li>\n\n\n\n
        • \u6216\uff08||<\/code>\uff09<\/strong>\uff1a\u53ea\u8981\u6709\u4e00\u4e2a\u64cd\u4f5c\u6570\u4e3a true<\/code>\uff0c\u7ed3\u679c\u5c31\u4e3a true<\/code>\u3002<\/li>\n\n\n\n
        • \u975e\uff08!<\/code>\uff09<\/strong>\uff1a\u5c06\u64cd\u4f5c\u6570\u7684\u5e03\u5c14\u503c\u53d6\u53cd\u3002<\/li>\n<\/ul>\n\n\n\n
          let x = true, y = false;\nconsole.log(x && y);  \/\/ \u8f93\u51fa: false\nconsole.log(x || y);  \/\/ \u8f93\u51fa: true\nconsole.log(!x);      \/\/ \u8f93\u51fa: false<\/code><\/pre>\n\n\n\n
          5. \u6761\u4ef6\u8fd0\u7b97\u7b26\uff08\u4e09\u5143\u8fd0\u7b97\u7b26\uff09<\/strong><\/h3>\n\n\n\n
          \u7528\u4e8e\u6839\u636e\u6761\u4ef6\u9009\u62e9\u4e24\u4e2a\u503c\u4e4b\u4e00\u3002\u8bed\u6cd5\u4e3a\uff1a<\/p>\n\n\n\n
          condition ? expr1 : expr2<\/code><\/pre>\n\n\n\n
          \u5982\u679c condition<\/code> \u4e3a true<\/code>\uff0c\u8fd4\u56de expr1<\/code>\uff0c\u5426\u5219\u8fd4\u56de expr2<\/code>\u3002<\/p>\n\n\n\n
          let age = 18;\nlet result = age >= 18 ? \"Adult\" : \"Minor\";\nconsole.log(result);  \/\/ \u8f93\u51fa: Adult<\/code><\/pre>\n\n\n\n
          6. \u7c7b\u578b\u8fd0\u7b97\u7b26\uff08Type Operators\uff09<\/strong><\/h3>\n\n\n\n
            \n
          • typeof<\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u8868\u793a\u6570\u636e\u7c7b\u578b\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n
            let x = 42;\nconsole.log(typeof x);  \/\/ \u8f93\u51fa: number<\/code><\/pre>\n\n\n\n
              \n
            • instanceof<\/strong>\uff1a\u68c0\u67e5\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u662f\u67d0\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u3002<\/li>\n<\/ul>\n\n\n\n
              let arr = [1, 2, 3];\nconsole.log(arr instanceof Array);  \/\/ \u8f93\u51fa: true<\/code><\/pre>\n\n\n\n
              7. \u4f4d\u8fd0\u7b97\u7b26\uff08Bitwise Operators\uff09<\/strong><\/h3>\n\n\n\n
              \u4f4d\u8fd0\u7b97\u7b26\u7528\u4e8e\u5bf9\u6574\u6570\u7684\u4e8c\u8fdb\u5236\u4f4d\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n\n\n\n
                \n
              • \u6309\u4f4d\u4e0e\uff08&<\/code>\uff09<\/strong>\uff1a\u5bf9\u4e24\u4e2a\u6570\u7684\u6bcf\u4e00\u4f4d\u8fdb\u884c\u4e0e\u8fd0\u7b97\u3002<\/li>\n\n\n\n
              • \u6309\u4f4d\u6216\uff08|<\/code>\uff09<\/strong>\uff1a\u5bf9\u4e24\u4e2a\u6570\u7684\u6bcf\u4e00\u4f4d\u8fdb\u884c\u6216\u8fd0\u7b97\u3002<\/li>\n\n\n\n
              • \u6309\u4f4d\u5f02\u6216\uff08^<\/code>\uff09<\/strong>\uff1a\u5bf9\u4e24\u4e2a\u6570\u7684\u6bcf\u4e00\u4f4d\u8fdb\u884c\u5f02\u6216\u8fd0\u7b97\u3002<\/li>\n\n\n\n
              • \u6309\u4f4d\u53d6\u53cd\uff08~<\/code>\uff09<\/strong>\uff1a\u5bf9\u6570\u503c\u7684\u6bcf\u4e00\u4f4d\u8fdb\u884c\u53d6\u53cd\u64cd\u4f5c\u3002<\/li>\n\n\n\n
              • \u5de6\u79fb\uff08<<<\/code>\uff09<\/strong>\uff1a\u5c06\u6570\u5b57\u7684\u6240\u6709\u4f4d\u5411\u5de6\u79fb\u52a8\u6307\u5b9a\u7684\u4f4d\u6570\u3002<\/li>\n\n\n\n
              • \u53f3\u79fb\uff08>><\/code>\uff09<\/strong>\uff1a\u5c06\u6570\u5b57\u7684\u6240\u6709\u4f4d\u5411\u53f3\u79fb\u52a8\u6307\u5b9a\u7684\u4f4d\u6570\u3002<\/li>\n\n\n\n
              • \u65e0\u7b26\u53f7\u53f3\u79fb\uff08>>><\/code>\uff09<\/strong>\uff1a\u5c06\u6570\u5b57\u7684\u6240\u6709\u4f4d\u5411\u53f3\u79fb\u52a8\u6307\u5b9a\u7684\u4f4d\u6570\uff0c\u5e76\u5728\u5de6\u8fb9\u8865\u5145 0\u3002<\/li>\n<\/ul>\n\n\n\n
                let x = 5, y = 3;\nconsole.log(x & y);  \/\/ \u8f93\u51fa: 1 (0101 & 0011 = 0001)\nconsole.log(x | y);  \/\/ \u8f93\u51fa: 7 (0101 | 0011 = 0111)\nconsole.log(x ^ y);  \/\/ \u8f93\u51fa: 6 (0101 ^ 0011 = 0110)<\/code><\/pre>\n\n\n\n
                8. \u7a7a\u503c\u5408\u5e76\u8fd0\u7b97\u7b26\uff08Nullish Coalescing Operator\uff09<\/strong><\/h3>\n\n\n\n
                ??<\/code> \u662f\u4e00\u4e2a\u65b0\u7684\u8fd0\u7b97\u7b26\uff0c\u7528\u4e8e\u8fd4\u56de\u5176\u5de6\u4fa7\u64cd\u4f5c\u6570\u7684\u503c\uff0c\u5f53\u5de6\u4fa7\u4e3a null<\/code> \u6216 undefined<\/code> \u65f6\uff0c\u8fd4\u56de\u53f3\u4fa7\u7684\u64cd\u4f5c\u6570\u3002<\/p>\n\n\n\n
                let x = null;\nlet result = x ?? 'Default';\nconsole.log(result);  \/\/ \u8f93\u51fa: Default<\/code><\/pre>\n\n\n\n
                9. \u89e3\u6784\u8d4b\u503c\u8fd0\u7b97\u7b26\uff08Destructuring Assignment\uff09<\/strong><\/h3>\n\n\n\n
                \u7528\u4e8e\u4ece\u6570\u7ec4\u6216\u5bf9\u8c61\u4e2d\u63d0\u53d6\u503c\uff0c\u5e76\u5c06\u5176\u8d4b\u7ed9\u53d8\u91cf\u3002<\/p>\n\n\n\n
                a. \u6570\u7ec4\u89e3\u6784<\/strong><\/h4>\n\n\n\n
                let arr = [1, 2, 3];\nlet [a, b] = arr;\nconsole.log(a);  \/\/ \u8f93\u51fa: 1\nconsole.log(b);  \/\/ \u8f93\u51fa: 2<\/code><\/pre>\n\n\n\n
                b. \u5bf9\u8c61\u89e3\u6784<\/strong><\/h4>\n\n\n\n
                let obj = { name: \"Alice\", age: 25 };\nlet { name, age } = obj;\nconsole.log(name);  \/\/ \u8f93\u51fa: Alice\nconsole.log(age);   \/\/ \u8f93\u51fa: 25<\/code><\/pre>\n\n\n\n
                \n\n\n\n
                \u603b\u7ed3<\/h3>\n\n\n\n
                JavaScript \u63d0\u4f9b\u4e86\u591a\u79cd\u8fd0\u7b97\u7b26\u6765\u64cd\u4f5c\u6570\u636e\uff0c\u5305\u62ec\u7b97\u672f\u8fd0\u7b97\u3001\u6bd4\u8f83\u8fd0\u7b97\u3001\u903b\u8f91\u8fd0\u7b97\u3001\u8d4b\u503c\u8fd0\u7b97\u7b49\u3002\u638c\u63e1\u8fd9\u4e9b\u8fd0\u7b97\u7b26\u80fd\u5e2e\u52a9\u4f60\u66f4\u9ad8\u6548\u5730\u5904\u7406\u6570\u636e\u548c\u5b9e\u73b0\u5404\u79cd\u903b\u8f91\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                JavaScript \u8fd0\u7b97\u7b26\uff08Operators\uff09 \u662f\u7528\u4e8e\u6267\u884c\u64cd\u4f5c\u7684\u7b26\u53f7\uff0c\u53ef\u4ee5\u7528\u4e8e\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\uff08\u5982\u6570\u5b57\u3001\u5b57\u7b26 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[],"class_list":["post-2033","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2033","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2033"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2033\/revisions"}],"predecessor-version":[{"id":2034,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2033\/revisions\/2034"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2033"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2033"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}