{"id":2021,"date":"2025-02-25T22:27:35","date_gmt":"2025-02-25T14:27:35","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2021"},"modified":"2025-02-25T22:27:35","modified_gmt":"2025-02-25T14:27:35","slug":"javascript-%e5%af%b9%e8%b1%a1","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/02\/25\/javascript-%e5%af%b9%e8%b1%a1\/","title":{"rendered":"JavaScript \u5bf9\u8c61"},"content":{"rendered":"\n

\u5728 JavaScript \u4e2d\uff0c\u5bf9\u8c61\uff08Object\uff09<\/strong> \u662f\u4e00\u79cd\u7528\u4e8e\u5b58\u50a8\u591a\u4e2a\u503c\u7684\u6570\u636e\u7ed3\u6784\u3002\u5bf9\u8c61\u662f\u5f15\u7528\u6570\u636e\u7c7b\u578b\uff0c\u5141\u8bb8\u5c06\u591a\u4e2a\u4e0d\u540c\u7c7b\u578b\u7684\u503c\uff08\u5982\u5b57\u7b26\u4e32\u3001\u6570\u5b57\u3001\u6570\u7ec4\u3001\u751a\u81f3\u5176\u4ed6\u5bf9\u8c61\uff09\u7ec4\u5408\u5728\u4e00\u8d77\u3002\u5bf9\u8c61\u901a\u8fc7\u5c5e\u6027\uff08\u952e-\u503c\u5bf9\uff09\u6765\u5b58\u50a8\u6570\u636e\u3002<\/p>\n\n\n\n

1. \u521b\u5efa\u5bf9\u8c61<\/strong><\/h3>\n\n\n\n

\u4f60\u53ef\u4ee5\u901a\u8fc7\u4e24\u79cd\u65b9\u5f0f\u521b\u5efa\u5bf9\u8c61\uff1a<\/p>\n\n\n\n

a. \u4f7f\u7528\u82b1\u62ec\u53f7\u5b57\u9762\u91cf<\/strong><\/h4>\n\n\n\n

\u8fd9\u662f\u6700\u5e38\u89c1\u4e14\u63a8\u8350\u7684\u521b\u5efa\u5bf9\u8c61\u7684\u65b9\u5f0f\u3002<\/p>\n\n\n\n

let person = {\n  name: \"Alice\",\n  age: 25,\n  isActive: true\n};\nconsole.log(person);  \/\/ \u8f93\u51fa\uff1a{ name: \"Alice\", age: 25, isActive: true }<\/code><\/pre>\n\n\n\n
b. \u4f7f\u7528 new Object()<\/code><\/strong><\/h4>\n\n\n\n
\u901a\u8fc7 new Object()<\/code> \u8bed\u6cd5\u521b\u5efa\u5bf9\u8c61\uff0c\u867d\u7136\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u4f7f\u7528\uff0c\u4f46\u901a\u5e38\u4e0d\u63a8\u8350\uff0c\u56e0\u4e3a\u5b83\u8f83\u4e3a\u5197\u957f\u3002<\/p>\n\n\n\n
let person = new Object();\nperson.name = \"Bob\";\nperson.age = 30;\nperson.isActive = false;\nconsole.log(person);  \/\/ \u8f93\u51fa\uff1a{ name: \"Bob\", age: 30, isActive: false }<\/code><\/pre>\n\n\n\n
\n\n\n\n
2. \u8bbf\u95ee\u548c\u4fee\u6539\u5bf9\u8c61\u7684\u5c5e\u6027<\/strong><\/h3>\n\n\n\n
\u5bf9\u8c61\u7684\u5c5e\u6027\u53ef\u4ee5\u901a\u8fc7\u70b9\u7b26\u53f7\uff08.<\/code>\uff09\u6216\u65b9\u62ec\u53f7\uff08[]<\/code>\uff09\u8bbf\u95ee\u6216\u4fee\u6539\u3002<\/p>\n\n\n\n
a. \u70b9\u7b26\u53f7\u8bbf\u95ee<\/strong><\/h4>\n\n\n\n
let person = {\n  name: \"Alice\",\n  age: 25\n};\nconsole.log(person.name);  \/\/ \u8f93\u51fa\uff1aAlice\nconsole.log(person.age);  \/\/ \u8f93\u51fa\uff1a25<\/code><\/pre>\n\n\n\n
b. \u65b9\u62ec\u53f7\u8bbf\u95ee<\/strong><\/h4>\n\n\n\n
\u65b9\u62ec\u53f7\u5141\u8bb8\u4f60\u4f7f\u7528\u52a8\u6001\u7684\u5b57\u7b26\u4e32\u4f5c\u4e3a\u5c5e\u6027\u540d\uff0c\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u5305\u542b\u7a7a\u683c\u6216\u7279\u6b8a\u5b57\u7b26\u7684\u5c5e\u6027\u540d\u3002<\/p>\n\n\n\n
let person = {\n  \"first name\": \"Alice\",\n  age: 25\n};\nconsole.log(person[\"first name\"]);  \/\/ \u8f93\u51fa\uff1aAlice\nconsole.log(person[\"age\"]);  \/\/ \u8f93\u51fa\uff1a25<\/code><\/pre>\n\n\n\n
\u4fee\u6539\u5c5e\u6027\u503c<\/h4>\n\n\n\n
\u4f60\u53ef\u4ee5\u76f4\u63a5\u7ed9\u5bf9\u8c61\u7684\u5c5e\u6027\u8d4b\u65b0\u503c\u6765\u4fee\u6539\u5b83\u3002<\/p>\n\n\n\n
let person = {\n  name: \"Alice\",\n  age: 25\n};\nperson.age = 26;  \/\/ \u4fee\u6539\u5c5e\u6027\u503c\nconsole.log(person.age);  \/\/ \u8f93\u51fa\uff1a26<\/code><\/pre>\n\n\n\n
\u6dfb\u52a0\u65b0\u5c5e\u6027<\/h4>\n\n\n\n
\u5bf9\u8c61\u662f\u52a8\u6001\u7684\uff0c\u4f60\u53ef\u4ee5\u968f\u65f6\u7ed9\u5bf9\u8c61\u6dfb\u52a0\u65b0\u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n
let person = {\n  name: \"Alice\",\n  age: 25\n};\nperson.city = \"New York\";  \/\/ \u6dfb\u52a0\u65b0\u5c5e\u6027\nconsole.log(person.city);  \/\/ \u8f93\u51fa\uff1aNew York<\/code><\/pre>\n\n\n\n
\n\n\n\n
3. \u5220\u9664\u5bf9\u8c61\u7684\u5c5e\u6027<\/strong><\/h3>\n\n\n\n
\u4f60\u53ef\u4ee5\u4f7f\u7528 delete<\/code> \u64cd\u4f5c\u7b26\u5220\u9664\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n
let person = {\n  name: \"Alice\",\n  age: 25,\n  city: \"New York\"\n};\ndelete person.city;  \/\/ \u5220\u9664\u5c5e\u6027\nconsole.log(person.city);  \/\/ \u8f93\u51fa\uff1aundefined<\/code><\/pre>\n\n\n\n
\n\n\n\n
4. \u5bf9\u8c61\u7684\u65b9\u6cd5<\/strong><\/h3>\n\n\n\n
\u5bf9\u8c61\u4e0d\u4ec5\u53ef\u4ee5\u5305\u542b\u6570\u636e\uff08\u5c5e\u6027\uff09\uff0c\u8fd8\u53ef\u4ee5\u5305\u542b\u884c\u4e3a\uff08\u65b9\u6cd5\uff09\u3002\u65b9\u6cd5\u662f\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u5176\u503c\u4e3a\u4e00\u4e2a\u51fd\u6570\u3002<\/p>\n\n\n\n
let person = {\n  name: \"Alice\",\n  age: 25,\n  greet: function() {\n    console.log(\"Hello, \" + this.name);\n  }\n};\nperson.greet();  \/\/ \u8f93\u51fa\uff1aHello, Alice<\/code><\/pre>\n\n\n\n
\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cgreet<\/code> \u662f\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5b83\u4f7f\u7528 this<\/code> \u5173\u952e\u5b57\u6765\u5f15\u7528\u5f53\u524d\u5bf9\u8c61\u7684 name<\/code> \u5c5e\u6027\u3002<\/p>\n\n\n\n
\n\n\n\n
5. this<\/code> \u5173\u952e\u5b57<\/strong><\/h3>\n\n\n\n
\u5728\u5bf9\u8c61\u7684\u65b9\u6cd5\u4e2d\uff0cthis<\/code> \u5173\u952e\u5b57\u6307\u5411\u8c03\u7528\u8be5\u65b9\u6cd5\u7684\u5bf9\u8c61\u3002this<\/code> \u4f7f\u5f97\u4f60\u53ef\u4ee5\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n
let person = {\n  name: \"Alice\",\n  age: 25,\n  greet: function() {\n    console.log(\"Hello, \" + this.name);\n  }\n};\nperson.greet();  \/\/ \u8f93\u51fa\uff1aHello, Alice<\/code><\/pre>\n\n\n\n
\u5982\u679c this<\/code> \u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u4f7f\u7528\uff0c\u5219\u6307\u5411\u5168\u5c40\u5bf9\u8c61\uff08\u5728\u6d4f\u89c8\u5668\u4e2d\u662f window<\/code>\uff09\u3002<\/p>\n\n\n\n
\n\n\n\n
6. \u5bf9\u8c61\u904d\u5386<\/strong><\/h3>\n\n\n\n
\u4f60\u53ef\u4ee5\u4f7f\u7528 for...in<\/code> \u5faa\u73af\u6765\u904d\u5386\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n
let person = {\n  name: \"Alice\",\n  age: 25,\n  city: \"New York\"\n};\n\nfor (let key in person) {\n  console.log(key + \": \" + person[key]);\n}\n\/\/ \u8f93\u51fa\uff1a\n\/\/ name: Alice\n\/\/ age: 25\n\/\/ city: New York<\/code><\/pre>\n\n\n\n
\n\n\n\n
7. \u5bf9\u8c61\u7684 Object<\/code> \u65b9\u6cd5<\/strong><\/h3>\n\n\n\n
JavaScript \u63d0\u4f9b\u4e86\u4e00\u4e9b\u5185\u7f6e\u7684 Object<\/code> \u65b9\u6cd5\u6765\u64cd\u4f5c\u5bf9\u8c61\u3002<\/p>\n\n\n\n
    \n
  • Object.keys()<\/code><\/strong>\uff1a\u8fd4\u56de\u5bf9\u8c61\u7684\u6240\u6709\u5c5e\u6027\u540d\uff08\u952e\uff09\u7ec4\u6210\u7684\u6570\u7ec4\u3002<\/li>\n<\/ul>\n\n\n\n
    let person = {\n  name: \"Alice\",\n  age: 25\n};\nconsole.log(Object.keys(person));  \/\/ \u8f93\u51fa\uff1a[\"name\", \"age\"]<\/code><\/pre>\n\n\n\n
      \n
    • Object.values()<\/code><\/strong>\uff1a\u8fd4\u56de\u5bf9\u8c61\u7684\u6240\u6709\u5c5e\u6027\u503c\u7ec4\u6210\u7684\u6570\u7ec4\u3002<\/li>\n<\/ul>\n\n\n\n
      let person = {\n  name: \"Alice\",\n  age: 25\n};\nconsole.log(Object.values(person));  \/\/ \u8f93\u51fa\uff1a[\"Alice\", 25]<\/code><\/pre>\n\n\n\n
        \n
      • Object.entries()<\/code><\/strong>\uff1a\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u5bf9\u8c61\u7684\u6bcf\u4e2a\u952e\u503c\u5bf9\u3002<\/li>\n<\/ul>\n\n\n\n
        let person = {\n  name: \"Alice\",\n  age: 25\n};\nconsole.log(Object.entries(person));\n\/\/ \u8f93\u51fa\uff1a[[\"name\", \"Alice\"], [\"age\", 25]]<\/code><\/pre>\n\n\n\n
          \n
        • Object.assign()<\/code><\/strong>\uff1a\u7528\u4e8e\u5c06\u4e00\u4e2a\u6216\u591a\u4e2a\u6e90\u5bf9\u8c61\u7684\u6240\u6709\u53ef\u679a\u4e3e\u5c5e\u6027\u590d\u5236\u5230\u76ee\u6807\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n\n\n\n
          let person = {\n  name: \"Alice\"\n};\nlet contact = {\n  email: \"alice@example.com\"\n};\nObject.assign(person, contact);  \/\/ \u5c06 contact \u7684\u5c5e\u6027\u5408\u5e76\u5230 person\nconsole.log(person);\n\/\/ \u8f93\u51fa\uff1a{ name: \"Alice\", email: \"alice@example.com\" }<\/code><\/pre>\n\n\n\n
          \n\n\n\n
          8. \u603b\u7ed3<\/strong><\/h3>\n\n\n\n
            \n
          • \u5bf9\u8c61<\/strong>\uff1a\u662f\u4e00\u79cd\u5bb9\u5668\uff0c\u5b58\u50a8\u591a\u4e2a\u952e\u503c\u5bf9\u3002<\/li>\n\n\n\n
          • \u8bbf\u95ee\u548c\u4fee\u6539<\/strong>\uff1a\u53ef\u4ee5\u901a\u8fc7\u70b9\u7b26\u53f7\u548c\u65b9\u62ec\u53f7\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/li>\n\n\n\n
          • \u65b9\u6cd5<\/strong>\uff1a\u5bf9\u8c61\u53ef\u4ee5\u5305\u542b\u65b9\u6cd5\uff0c\u65b9\u6cd5\u662f\u4e00\u4e2a\u51fd\u6570\u3002<\/li>\n\n\n\n
          • this<\/code><\/strong>\uff1a\u5728\u5bf9\u8c61\u7684\u65b9\u6cd5\u4e2d\uff0cthis<\/code> \u5f15\u7528\u5f53\u524d\u5bf9\u8c61\u3002<\/li>\n\n\n\n
          • \u904d\u5386<\/strong>\uff1a\u4f7f\u7528 for...in<\/code> \u5faa\u73af\u904d\u5386\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/li>\n\n\n\n
          • \u5185\u7f6e\u65b9\u6cd5<\/strong>\uff1aObject.keys()<\/code>\u3001Object.values()<\/code>\u3001Object.entries()<\/code> \u548c Object.assign()<\/code> \u662f\u5e38\u7528\u7684\u5185\u7f6e\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n
            \u5bf9\u8c61\u662f JavaScript \u4e2d\u975e\u5e38\u91cd\u8981\u7684\u6570\u636e\u7ed3\u6784\uff0c\u80fd\u591f\u5e2e\u52a9\u4f60\u4ee5\u6709\u7ec4\u7ec7\u7684\u65b9\u5f0f\u7ba1\u7406\u6570\u636e\u3002\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
            \u5728 JavaScript \u4e2d\uff0c\u5bf9\u8c61\uff08Object\uff09 \u662f\u4e00\u79cd\u7528\u4e8e\u5b58\u50a8\u591a\u4e2a\u503c\u7684\u6570\u636e\u7ed3\u6784\u3002\u5bf9\u8c61\u662f\u5f15\u7528\u6570\u636e\u7c7b\u578b\uff0c\u5141\u8bb8\u5c06 […]<\/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-2021","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2021","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=2021"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2021\/revisions"}],"predecessor-version":[{"id":2022,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2021\/revisions\/2022"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2021"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2021"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2021"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}