{"id":43,"date":"2026-02-17T19:00:44","date_gmt":"2026-02-17T11:00:44","guid":{"rendered":"https:\/\/word.ronrin.cn\/?p=43"},"modified":"2026-02-17T19:00:44","modified_gmt":"2026-02-17T11:00:44","slug":"javascript-%e5%9f%ba%e6%9c%ac%e8%af%ad%e6%b3%95","status":"publish","type":"post","link":"https:\/\/word.ronrin.cn\/index.php\/2026\/02\/17\/javascript-%e5%9f%ba%e6%9c%ac%e8%af%ad%e6%b3%95\/","title":{"rendered":"JavaScript \u57fa\u672c\u8bed\u6cd5"},"content":{"rendered":"\n

JavaScript \u662f\u7f51\u9875\u7684”\u884c\u4e3a\u8bed\u8a00”\uff0c\u8ba9\u7f51\u9875\u52a8\u8d77\u6765\u3001\u54cd\u5e94\u7528\u6237\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u6838\u5fc3\u8bed\u6cd5\uff0c\u4ece\u96f6\u5f00\u59cb\uff1a<\/p>\n\n\n\n

\n\n\n\n

\ud83d\udcdd 1. \u8bed\u53e5\u548c\u5206\u53f7<\/h3>\n\n\n\n

JavaScript \u7a0b\u5e8f\u7531\u4e00\u7cfb\u5217\u8bed\u53e5<\/strong>\u7ec4\u6210\uff0c\u6bcf\u6761\u8bed\u53e5\u4ee5\u5206\u53f7 ;<\/code> \u7ed3\u5c3e\uff08\u867d\u7136\u4e0d\u662f\u5f3a\u5236\uff0c\u4f46\u5f3a\u70c8\u5efa\u8bae\u52a0\u4e0a\uff09\u3002<\/p>\n\n\n\n

javascript<\/p>\n\n\n\n

\/\/ \u58f0\u660e\u53d8\u91cf<\/em>\nlet name = \"\u5c0f\u660e\";\n\n\/\/ \u6267\u884c\u64cd\u4f5c<\/em>\nconsole.log(\"\u4f60\u597d\uff0c\" + name);\n\n\/\/ \u591a\u4e2a\u8bed\u53e5<\/em>\nlet x = 5;\nlet y = 10;\nlet z = x + y;<\/pre>\n\n\n\n
\n\n\n\n
\ud83c\udff7\ufe0f 2. \u6ce8\u91ca<\/h3>\n\n\n\n
\u6ce8\u91ca\u4e0d\u4f1a\u88ab\u6267\u884c\uff0c\u7528\u6765\u89e3\u91ca\u4ee3\u7801\u3002<\/p>\n\n\n\n
javascript<\/p>\n\n\n\n
\/\/ \u8fd9\u662f\u5355\u884c\u6ce8\u91ca<\/em>\n\n\/*<\/em>\n  \u8fd9\u662f\u591a\u884c\u6ce8\u91ca\n  \u53ef\u4ee5\u5199\u5f88\u591a\u884c\n  \u7528\u6765\u8be6\u7ec6\u8bf4\u660e\n*\/\n\n\/**<\/em>\n * \u8fd9\u4e5f\u662f\u591a\u884c\u6ce8\u91ca\n * \u901a\u5e38\u7528\u6765\u63cf\u8ff0\u51fd\u6570\n *\/<\/pre>\n\n\n\n
\n\n\n\n
\ud83d\udce6 3. \u53d8\u91cf<\/h3>\n\n\n\n
\u53d8\u91cf\u7528\u6765\u5b58\u50a8\u6570\u636e\u3002<\/p>\n\n\n\n
\u58f0\u660e\u53d8\u91cf\u7684\u4e09\u79cd\u65b9\u5f0f<\/h4>\n\n\n\n
\u5173\u952e\u5b57<\/th>\u7279\u70b9<\/th>\u4f7f\u7528\u573a\u666f<\/th><\/tr><\/thead>
let<\/code><\/td>\u53ef\u4ee5\u4fee\u6539\uff0c\u5757\u7ea7\u4f5c\u7528\u57df<\/td>\u73b0\u4ee3\u5199\u6cd5<\/strong>\uff0c\u5927\u591a\u6570\u60c5\u51b5\u7528\u8fd9\u4e2a<\/td><\/tr>
const<\/code><\/td>\u4e0d\u80fd\u4fee\u6539\uff08\u5e38\u91cf\uff09\uff0c\u5757\u7ea7\u4f5c\u7528\u57df<\/td>\u503c\u4e0d\u4f1a\u53d8\u7684\u53d8\u91cf\uff08\u5982\u5706\u5468\u7387\u3001\u914d\u7f6e\uff09<\/td><\/tr>
var<\/code><\/td>\u53ef\u4ee5\u4fee\u6539\uff0c\u51fd\u6570\u4f5c\u7528\u57df<\/td>\u8001\u5f0f\u5199\u6cd5<\/strong>\uff0c\u73b0\u5728\u5c3d\u91cf\u5c11\u7528<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
javascript<\/p>\n\n\n\n
\/\/ let - \u53ef\u4ee5\u91cd\u65b0\u8d4b\u503c<\/em>\nlet age = 18;\nage = 19;  \/\/ \u6ca1\u95ee\u9898<\/em>\n\n\/\/ const - \u4e0d\u80fd\u91cd\u65b0\u8d4b\u503c<\/em>\nconst PI = 3.14159;\n\/\/ PI = 3.14;  \/\/ \u62a5\u9519\uff01\u4e0d\u80fd\u4fee\u6539<\/em>\n\n\/\/ var - \u8001\u5f0f\u5199\u6cd5\uff08\u4e86\u89e3\u5373\u53ef\uff09<\/em>\nvar oldWay = \"\u4e0d\u8981\u7528\u6211\";<\/pre>\n\n\n\n
\u53d8\u91cf\u547d\u540d\u89c4\u5219<\/h4>\n\n\n\n
    \n
  • \u53ea\u80fd\u5305\u542b\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\u00a0_<\/code>\u3001\u7f8e\u5143\u7b26\u53f7\u00a0$<\/code><\/li>\n\n\n\n
  • \u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934<\/li>\n\n\n\n
  • \u533a\u5206\u5927\u5c0f\u5199\uff08myName<\/code>\u00a0\u548c\u00a0MyName<\/code>\u00a0\u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u53d8\u91cf\uff09<\/li>\n\n\n\n
  • \u4f7f\u7528\u9a7c\u5cf0\u547d\u540d\u6cd5\uff1afirstName<\/code>\u3001userAge<\/code>\u3001isLoggedIn<\/code><\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n
    \ud83d\udd22 4. \u6570\u636e\u7c7b\u578b<\/h3>\n\n\n\n
    JavaScript \u6709\u51e0\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff1a<\/p>\n\n\n\n
    javascript<\/p>\n\n\n\n
    \/\/ \u6570\u5b57\uff08\u6574\u6570\u548c\u6d6e\u70b9\u6570\u90fd\u7528 Number\uff09<\/em>\nlet count = 10;\nlet price = 19.99;\nlet temperature = -5;\n\n\/\/ \u5b57\u7b26\u4e32\uff08\u6587\u672c\uff09<\/em>\nlet name = \"\u5f20\u4e09\";\nlet message = '\u4f60\u597d';\nlet template = `\u6211\u7684\u540d\u5b57\u662f${name}`;  \/\/ \u6a21\u677f\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u5d4c\u5165\u53d8\u91cf<\/em>\n\n\/\/ \u5e03\u5c14\u503c\uff08true\/false\uff09<\/em>\nlet isLoggedIn = true;\nlet isDeleted = false;\n\n\/\/ undefined\uff08\u672a\u5b9a\u4e49\uff09<\/em>\nlet futureValue;  \/\/ \u6ca1\u6709\u8d4b\u503c\uff0c\u503c\u5c31\u662f undefined<\/em>\n\n\/\/ null\uff08\u7a7a\u503c\uff0c\u4e3b\u52a8\u8bbe\u7f6e\u4e3a\u7a7a\uff09<\/em>\nlet empty = null;\n\n\/\/ \u5bf9\u8c61\uff08\u590d\u6742\u6570\u636e\uff09<\/em>\nlet person = {\n    name: \"\u674e\u56db\",\n    age: 25,\n    isStudent: false\n};\n\n\/\/ \u6570\u7ec4\uff08\u5217\u8868\uff09<\/em>\nlet colors = [\"\u7ea2\u8272\", \"\u84dd\u8272\", \"\u7eff\u8272\"];\nlet mixed = [1, \"\u6587\u5b57\", true, null];<\/pre>\n\n\n\n
    \n\n\n\n
    \u2795 5. \u8fd0\u7b97\u7b26<\/h3>\n\n\n\n
    \u7b97\u672f\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    let a = 10;\nlet b = 3;\n\nconsole.log(a + b);   \/\/ 13 \u52a0\u6cd5<\/em>\nconsole.log(a - b);   \/\/ 7  \u51cf\u6cd5<\/em>\nconsole.log(a * b);   \/\/ 30 \u4e58\u6cd5<\/em>\nconsole.log(a \/ b);   \/\/ 3.333... \u9664\u6cd5<\/em>\nconsole.log(a % b);   \/\/ 1  \u53d6\u4f59\uff0810\u9664\u4ee53\u4f591\uff09<\/em>\nconsole.log(a ** b);  \/\/ 1000 \u5e42\u8fd0\u7b97\uff0810\u76843\u6b21\u65b9\uff09<\/em>\n\n\/\/ \u81ea\u589e\u81ea\u51cf<\/em>\nlet count = 5;\ncount++;  \/\/ count \u53d8\u6210 6\uff08\u5148\u4f7f\u7528\u540e\u52a01\uff09<\/em>\n++count;  \/\/ count \u53d8\u6210 7\uff08\u5148\u52a01\u540e\u4f7f\u7528\uff09<\/em>\ncount--;  \/\/ count \u53d8\u6210 6<\/em><\/pre>\n\n\n\n
    \u8d4b\u503c\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    let x = 10;\nx += 5;   \/\/ x = x + 5 \u2192 15<\/em>\nx -= 3;   \/\/ x = x - 3 \u2192 12<\/em>\nx *= 2;   \/\/ x = x * 2 \u2192 24<\/em>\nx \/= 4;   \/\/ x = x \/ 4 \u2192 6<\/em><\/pre>\n\n\n\n
    \u6bd4\u8f83\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    console.log(5 == \"5\");    \/\/ true  \u76f8\u7b49\uff08\u53ea\u6bd4\u8f83\u503c\uff0c\u4e0d\u6bd4\u8f83\u7c7b\u578b\uff09<\/em>\nconsole.log(5 === \"5\");   \/\/ false \u4e25\u683c\u76f8\u7b49\uff08\u6bd4\u8f83\u503c\u548c\u7c7b\u578b\uff09\u2705 \u63a8\u8350\u7528\u8fd9\u4e2a<\/em>\nconsole.log(5 != \"5\");    \/\/ false \u4e0d\u7b49<\/em>\nconsole.log(5 !== \"5\");   \/\/ true  \u4e25\u683c\u4e0d\u7b49<\/em>\n\nconsole.log(5 > 3);       \/\/ true<\/em>\nconsole.log(5 >= 5);      \/\/ true<\/em>\nconsole.log(3 < 5);       \/\/ true<\/em>\nconsole.log(3 <= 5);      \/\/ true<\/em><\/pre>\n\n\n\n
    \u903b\u8f91\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    let a = true;\nlet b = false;\n\nconsole.log(a && b);  \/\/ false  AND\uff08\u4e0e\uff09\uff1a\u4e24\u8fb9\u90fd true \u624d true<\/em>\nconsole.log(a || b);  \/\/ true   OR\uff08\u6216\uff09\uff1a\u4e00\u8fb9 true \u5c31 true<\/em>\nconsole.log(!a);      \/\/ false  NOT\uff08\u975e\uff09\uff1a\u53d6\u53cd<\/em>\n\n\/\/ \u5b9e\u9645\u5e94\u7528<\/em>\nlet age = 20;\nlet hasTicket = true;\n\n\/\/ \u53ef\u4ee5\u8fdb\u573a\u5417\uff1f\u5fc5\u987b\u5e74\u6ee118\u5c81\u4e14\u6709\u7968<\/em>\nlet canEnter = age >= 18 && hasTicket;  \/\/ true<\/em>\n\n\/\/ \u53ef\u4ee5\u6253\u6298\u5417\uff1f\u8981\u4e48\u662f\u5b66\u751f\uff0c\u8981\u4e48\u662f\u8001\u4eba<\/em>\nlet isStudent = false;\nlet isSenior = true;\nlet canDiscount = isStudent || isSenior;  \/\/ true<\/em><\/pre>\n\n\n\n
    \n\n\n\n
    \ud83d\udd00 6. \u6761\u4ef6\u8bed\u53e5<\/h3>\n\n\n\n
    if…else<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    let age = 18;\n\nif (age >= 18) {\n    console.log(\"\u4f60\u662f\u6210\u5e74\u4eba\");\n} else {\n    console.log(\"\u4f60\u662f\u672a\u6210\u5e74\u4eba\");\n}\n\n\/\/ \u591a\u6761\u4ef6<\/em>\nlet score = 85;\n\nif (score >= 90) {\n    console.log(\"\u4f18\u79c0\");\n} else if (score >= 80) {\n    console.log(\"\u826f\u597d\");\n} else if (score >= 60) {\n    console.log(\"\u53ca\u683c\");\n} else {\n    console.log(\"\u4e0d\u53ca\u683c\");\n}<\/pre>\n\n\n\n
    switch \u8bed\u53e5<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    let day = \"\u5468\u4e00\";\n\nswitch (day) {\n    case \"\u5468\u4e00\":\n        console.log(\"\u5f00\u59cb\u5de5\u4f5c\");\n        break;\n    case \"\u5468\u4e94\":\n        console.log(\"\u9a6c\u4e0a\u5468\u672b\");\n        break;\n    case \"\u5468\u516d\":\n    case \"\u5468\u65e5\":\n        console.log(\"\u5468\u672b\u4f11\u606f\");\n        break;\n    default:\n        console.log(\"\u666e\u901a\u5de5\u4f5c\u65e5\");\n}<\/pre>\n\n\n\n
    \n\n\n\n
    \ud83d\udd01 7. \u5faa\u73af<\/h3>\n\n\n\n
    for \u5faa\u73af\uff08\u77e5\u9053\u5faa\u73af\u6b21\u6570\u65f6\u7528\uff09<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    \/\/ \u6253\u5370 1 \u5230 5<\/em>\nfor (let i = 1; i <= 5; i++) {\n    console.log(i);\n}\n\/\/ \u8f93\u51fa\uff1a1 2 3 4 5<\/em>\n\n\/\/ \u904d\u5386\u6570\u7ec4<\/em>\nlet fruits = [\"\u82f9\u679c\", \"\u9999\u8549\", \"\u6a59\u5b50\"];\nfor (let i = 0; i < fruits.length; i++) {\n    console.log(fruits[i]);\n}<\/pre>\n\n\n\n
    while \u5faa\u73af\uff08\u4e0d\u77e5\u9053\u5faa\u73af\u6b21\u6570\u65f6\u7528\uff09<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    let count = 0;\n\nwhile (count < 5) {\n    console.log(\"\u5f53\u524d\u8ba1\u6570\uff1a\" + count);\n    count++;\n}\n\n\/\/ do...while\uff08\u81f3\u5c11\u6267\u884c\u4e00\u6b21\uff09<\/em>\nlet i = 0;\ndo {\n    console.log(\"\u81f3\u5c11\u6267\u884c\u4e00\u6b21\uff1a\" + i);\n    i++;\n} while (i < 3);<\/pre>\n\n\n\n
    for…of\uff08\u904d\u5386\u6570\u7ec4\uff09<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    let colors = [\"\u7ea2\", \"\u7eff\", \"\u84dd\"];\n\nfor (let color of colors) {\n    console.log(color);\n}\n\/\/ \u8f93\u51fa\uff1a\u7ea2 \u7eff \u84dd<\/em><\/pre>\n\n\n\n
    \n\n\n\n
    \ud83c\udfaf 8. \u51fd\u6570<\/h3>\n\n\n\n
    \u51fd\u6570\u662f\u5c01\u88c5\u4e00\u6bb5\u4ee3\u7801\u7684”\u5c0f\u5de5\u5177”\uff0c\u53ef\u4ee5\u91cd\u590d\u4f7f\u7528\u3002<\/p>\n\n\n\n
    javascript<\/p>\n\n\n\n
    \/\/ \u5b9a\u4e49\u51fd\u6570<\/em>\nfunction sayHello() {\n    console.log(\"\u4f60\u597d\uff01\");\n}\n\n\/\/ \u8c03\u7528\u51fd\u6570<\/em>\nsayHello();  \/\/ \u8f93\u51fa\uff1a\u4f60\u597d\uff01<\/em>\n\n\/\/ \u5e26\u53c2\u6570\u7684\u51fd\u6570<\/em>\nfunction greet(name) {\n    console.log(\"\u4f60\u597d\uff0c\" + name + \"\uff01\");\n}\n\ngreet(\"\u5f20\u4e09\");  \/\/ \u8f93\u51fa\uff1a\u4f60\u597d\uff0c\u5f20\u4e09\uff01<\/em>\ngreet(\"\u674e\u56db\");  \/\/ \u8f93\u51fa\uff1a\u4f60\u597d\uff0c\u674e\u56db\uff01<\/em>\n\n\/\/ \u5e26\u8fd4\u56de\u503c\u7684\u51fd\u6570<\/em>\nfunction add(a, b) {\n    return a + b;  \/\/ \u8fd4\u56de\u7ed3\u679c<\/em>\n}\n\nlet result = add(5, 3);\nconsole.log(result);  \/\/ 8<\/em>\n\n\/\/ \u7bad\u5934\u51fd\u6570\uff08ES6\u65b0\u5199\u6cd5\uff09<\/em>\nconst multiply = (a, b) => {\n    return a * b;\n};\n\n\/\/ \u5982\u679c\u53ea\u6709\u4e00\u884c\uff0c\u53ef\u4ee5\u66f4\u7b80\u6d01<\/em>\nconst square = x => x * x;\n\nconsole.log(multiply(4, 5));  \/\/ 20<\/em>\nconsole.log(square(6));       \/\/ 36<\/em><\/pre>\n\n\n\n
    \n\n\n\n
    \ud83e\udde9 9. \u5bf9\u8c61\u548c\u6570\u7ec4<\/h3>\n\n\n\n
    \u5bf9\u8c61\uff08\u952e\u503c\u5bf9\u96c6\u5408\uff09<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    \/\/ \u521b\u5efa\u5bf9\u8c61<\/em>\nlet user = {\n    name: \"\u738b\u4e94\",\n    age: 28,\n    email: \"wang@example.com\",\n    isAdmin: false,\n    \n    \/\/ \u5bf9\u8c61\u7684\u65b9\u6cd5<\/em>\n    sayHi: function() {\n        console.log(\"\u4f60\u597d\uff0c\u6211\u662f\" + this.name);\n    }\n};\n\n\/\/ \u8bbf\u95ee\u5c5e\u6027<\/em>\nconsole.log(user.name);      \/\/ \u738b\u4e94\uff08\u70b9\u53f7\u8bed\u6cd5\uff09<\/em>\nconsole.log(user[\"age\"]);    \/\/ 28\uff08\u65b9\u62ec\u53f7\u8bed\u6cd5\uff09<\/em>\n\n\/\/ \u4fee\u6539\u5c5e\u6027<\/em>\nuser.age = 29;\nuser[\"email\"] = \"new@example.com\";\n\n\/\/ \u8c03\u7528\u65b9\u6cd5<\/em>\nuser.sayHi();  \/\/ \u8f93\u51fa\uff1a\u4f60\u597d\uff0c\u6211\u662f\u738b\u4e94<\/em><\/pre>\n\n\n\n
    \u6570\u7ec4\uff08\u6709\u5e8f\u5217\u8868\uff09<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    \/\/ \u521b\u5efa\u6570\u7ec4<\/em>\nlet numbers = [1, 2, 3, 4, 5];\nlet mixed = [\"\u6587\u672c\", 42, true, null];\n\n\/\/ \u8bbf\u95ee\u5143\u7d20\uff08\u7d22\u5f15\u4ece0\u5f00\u59cb\uff09<\/em>\nconsole.log(numbers[0]);  \/\/ 1<\/em>\nconsole.log(numbers[2]);  \/\/ 3<\/em>\n\n\/\/ \u4fee\u6539\u5143\u7d20<\/em>\nnumbers[1] = 99;\nconsole.log(numbers);  \/\/ [1, 99, 3, 4, 5]<\/em>\n\n\/\/ \u5e38\u7528\u65b9\u6cd5<\/em>\nnumbers.push(6);        \/\/ \u672b\u5c3e\u6dfb\u52a0 \u2192 [1, 99, 3, 4, 5, 6]<\/em>\nnumbers.pop();          \/\/ \u5220\u9664\u672b\u5c3e \u2192 [1, 99, 3, 4, 5]<\/em>\nnumbers.unshift(0);     \/\/ \u5f00\u5934\u6dfb\u52a0 \u2192 [0, 1, 99, 3, 4, 5]<\/em>\nnumbers.shift();        \/\/ \u5220\u9664\u5f00\u5934 \u2192 [1, 99, 3, 4, 5]<\/em>\n\nconsole.log(numbers.length);  \/\/ 5\uff08\u6570\u7ec4\u957f\u5ea6\uff09<\/em><\/pre>\n\n\n\n
    \n\n\n\n
    \ud83d\udda5\ufe0f 10. \u4e0e\u7f51\u9875\u4ea4\u4e92<\/h3>\n\n\n\n
    \u5f39\u7a97<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    alert(\"\u8fd9\u662f\u4e00\u6761\u8b66\u544a\u6d88\u606f\");        \/\/ \u666e\u901a\u63d0\u793a<\/em>\nlet name = prompt(\"\u8bf7\u8f93\u5165\u540d\u5b57\");   \/\/ \u8f93\u5165\u6846<\/em>\nlet confirm = confirm(\"\u786e\u5b9a\u5417\uff1f\"); \/\/ \u786e\u8ba4\u6846\uff08\u8fd4\u56de true\/false\uff09<\/em><\/pre>\n\n\n\n
    \u64cd\u4f5c\u7f51\u9875\u5143\u7d20\uff08DOM\u64cd\u4f5c\uff09<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    \/\/ \u83b7\u53d6\u5143\u7d20<\/em>\nlet title = document.getElementById(\"title\");\nlet buttons = document.getElementsByClassName(\"btn\");\nlet firstBtn = document.querySelector(\".btn\");  \/\/ \u7b2c\u4e00\u4e2a\u5339\u914d\u7684\u5143\u7d20<\/em>\nlet allBtns = document.querySelectorAll(\".btn\"); \/\/ \u6240\u6709\u5339\u914d\u7684\u5143\u7d20<\/em>\n\n\/\/ \u4fee\u6539\u5185\u5bb9<\/em>\ntitle.textContent = \"\u65b0\u6807\u9898\";\ntitle.innerHTML = \"<span>\u5e26HTML\u7684\u6807\u9898<\/span>\";\n\n\/\/ \u4fee\u6539\u6837\u5f0f<\/em>\ntitle.style.color = \"red\";\ntitle.style.fontSize = \"20px\";\n\n\/\/ \u6dfb\u52a0\/\u5220\u9664\u7c7b\u540d<\/em>\ntitle.classList.add(\"active\");\ntitle.classList.remove(\"hidden\");\ntitle.classList.toggle(\"visible\");  \/\/ \u6709\u5c31\u5220\uff0c\u6ca1\u6709\u5c31\u52a0<\/em><\/pre>\n\n\n\n
    \u4e8b\u4ef6\u76d1\u542c<\/h4>\n\n\n\n
    javascript<\/p>\n\n\n\n
    \/\/ \u70b9\u51fb\u4e8b\u4ef6<\/em>\nlet button = document.getElementById(\"myButton\");\nbutton.addEventListener(\"click\", function() {\n    alert(\"\u6309\u94ae\u88ab\u70b9\u51fb\u4e86\uff01\");\n});\n\n\/\/ \u9f20\u6807\u79fb\u5165\/\u79fb\u51fa<\/em>\nlet box = document.querySelector(\".box\");\nbox.addEventListener(\"mouseenter\", function() {\n    this.style.backgroundColor = \"yellow\";\n});\nbox.addEventListener(\"mouseleave\", function() {\n    this.style.backgroundColor = \"white\";\n});\n\n\/\/ \u8868\u5355\u63d0\u4ea4<\/em>\nlet form = document.querySelector(\"form\");\nform.addEventListener(\"submit\", function(event) {\n    event.preventDefault();  \/\/ \u963b\u6b62\u8868\u5355\u9ed8\u8ba4\u63d0\u4ea4<\/em>\n    console.log(\"\u8868\u5355\u88ab\u63d0\u4ea4\u4e86\uff0c\u4f46\u6211\u963b\u6b62\u4e86\u5237\u65b0\");\n});<\/pre>\n\n\n\n
    \n\n\n\n
    \ud83c\udfaf \u5b8c\u6574\u793a\u4f8b\uff1a\u4e00\u4e2a\u7b80\u5355\u7684\u8ba1\u6570\u5668<\/h3>\n\n\n\n
    html<\/p>\n\n\n\n
    <button id=\"decrease\">-<\/button>\n<span id=\"count\">0<\/span>\n<button id=\"increase\">+<\/button>\n\n<script>\n    \/\/ \u83b7\u53d6\u5143\u7d20<\/em>\n    let countDisplay = document.getElementById(\"count\");\n    let decreaseBtn = document.getElementById(\"decrease\");\n    let increaseBtn = document.getElementById(\"increase\");\n    \n    let count = 0;\n    \n    \/\/ \u589e\u52a0<\/em>\n    increaseBtn.addEventListener(\"click\", function() {\n        count++;\n        countDisplay.textContent = count;\n        \n        \/\/ \u6839\u636e\u6570\u503c\u6539\u53d8\u989c\u8272<\/em>\n        if (count > 0) {\n            countDisplay.style.color = \"green\";\n        } else if (count < 0) {\n            countDisplay.style.color = \"red\";\n        } else {\n            countDisplay.style.color = \"black\";\n        }\n    });\n    \n    \/\/ \u51cf\u5c11<\/em>\n    decreaseBtn.addEventListener(\"click\", function() {\n        count--;\n        countDisplay.textContent = count;\n        \n        if (count > 0) {\n            countDisplay.style.color = \"green\";\n        } else if (count < 0) {\n            countDisplay.style.color = \"red\";\n        } else {\n            countDisplay.style.color = \"black\";\n        }\n    });\n<\/script><\/pre>\n\n\n\n
    \n\n\n\n
    \ud83d\udcda \u5b66\u4e60\u5efa\u8bae<\/h3>\n\n\n\n
      \n
    1. \u591a\u52a8\u624b\u5199<\/strong>\uff1a\u53ea\u770b\u4e0d\u5199\u6c38\u8fdc\u5b66\u4e0d\u4f1a<\/li>\n\n\n\n
    2. \u4ece\u7b80\u5355\u5f00\u59cb<\/strong>\uff1a\u5148\u5b66\u4f1a\u53d8\u91cf\u3001\u51fd\u6570\u3001\u6761\u4ef6\u5224\u65ad<\/li>\n\n\n\n
    3. \u5584\u7528 console.log()<\/strong>\uff1a\u968f\u65f6\u6253\u5370\u53d8\u91cf\uff0c\u770b\u4ee3\u7801\u6267\u884c\u5230\u54ea\u91cc<\/li>\n\n\n\n
    4. \u9047\u5230\u9519\u8bef\u4e0d\u8981\u614c<\/strong>\uff1a\u770b\u63a7\u5236\u53f0\u7684\u9519\u8bef\u63d0\u793a\uff0c\u6162\u6162\u5b66\u4f1a\u8c03\u8bd5<\/li>\n\n\n\n
    5. \u5faa\u5e8f\u6e10\u8fdb<\/strong>\uff1a\u5148\u5b66\u57fa\u7840\u8bed\u6cd5\uff0c\u518d\u5b66 DOM \u64cd\u4f5c\uff0c\u6700\u540e\u5b66 Ajax\u3001\u6846\u67b6<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
      JavaScript \u662f\u7f51\u9875\u7684&#822 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[12],"tags":[],"class_list":["post-43","post","type-post","status-publish","format-standard","hentry","category-javescript"],"_links":{"self":[{"href":"https:\/\/word.ronrin.cn\/index.php\/wp-json\/wp\/v2\/posts\/43","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/word.ronrin.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/word.ronrin.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/word.ronrin.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/word.ronrin.cn\/index.php\/wp-json\/wp\/v2\/comments?post=43"}],"version-history":[{"count":1,"href":"https:\/\/word.ronrin.cn\/index.php\/wp-json\/wp\/v2\/posts\/43\/revisions"}],"predecessor-version":[{"id":44,"href":"https:\/\/word.ronrin.cn\/index.php\/wp-json\/wp\/v2\/posts\/43\/revisions\/44"}],"wp:attachment":[{"href":"https:\/\/word.ronrin.cn\/index.php\/wp-json\/wp\/v2\/media?parent=43"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/word.ronrin.cn\/index.php\/wp-json\/wp\/v2\/categories?post=43"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/word.ronrin.cn\/index.php\/wp-json\/wp\/v2\/tags?post=43"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}