{"id":235151,"date":"2024-05-12T10:14:26","date_gmt":"2024-05-12T02:14:26","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/235151.html"},"modified":"2024-05-12T10:14:34","modified_gmt":"2024-05-12T02:14:34","slug":"javascript%e5%a6%82%e4%bd%95%e5%81%9a%e5%a4%9a%e4%b8%aa%e4%b8%8b%e6%8b%89%e8%8f%9c%e5%8d%95","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/235151.html","title":{"rendered":"JavaScript\u5982\u4f55\u505a\u591a\u4e2a\u4e0b\u62c9\u83dc\u5355"},"content":{"rendered":"

\"JavaScript\u5982\u4f55\u505a\u591a\u4e2a\u4e0b\u62c9\u83dc\u5355\"<\/p>\n

JavaScript \u5b9e\u73b0\u591a\u4e2a\u4e0b\u62c9\u83dc\u5355\u7684\u6838\u5fc3\u8981\u7d20\u5305\u62ec\u6784\u5efaDOM\u7ed3\u6784\u3001\u5b9a\u4e49\u4e0b\u62c9\u903b\u8f91\u3001\u5e94\u7528\u6837\u5f0f\u53d8\u5316<\/strong>\u3002\u4e00\u4e2a\u5178\u578b\u7684\u5b9e\u73b0\u65b9\u5f0f\u662f\u5728HTML\u4e2d\u521b\u5efa\u591a\u4e2aselect\u5143\u7d20\uff0c\u6bcf\u4e2a\u5bf9\u5e94\u4e00\u4e2a\u83dc\u5355\u3002JavaScript \u5c06\u76d1\u542c\u8fd9\u4e9b\u83dc\u5355\u7684\u53d8\u66f4\u4e8b\u4ef6\uff0c\u5e76\u6839\u636e\u9009\u62e9\u66f4\u65b0\u540e\u7eed\u83dc\u5355\u7684\u9009\u9879\u3002<\/p>\n<\/p>\n

\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u63cf\u8ff0\u5982\u4f55\u901a\u8fc7\u7f16\u5199JavaScript\u4ee3\u7801\u548c\u76f8\u5e94\u7684HTML\u7ed3\u6784\u6765\u5b9e\u73b0\u5173\u8054\u7684\u4e0b\u62c9\u83dc\u5355\uff0c\u8fd9\u901a\u5e38\u5728\u5b58\u5728\u5c42\u7ea7\u5173\u7cfb\u7684\u6570\u636e\u9009\u62e9\u65f6\u4f7f\u7528\uff0c\u6bd4\u5982\u9009\u62e9\u54c1\u724c\u540e\u518d\u9009\u62e9\u8be5\u54c1\u724c\u4e0b\u7684\u4ea7\u54c1\u578b\u53f7\u7b49\u3002<\/p>\n<\/p>\n

\u4e00\u3001HTML\u7ed3\u6784\u7684\u642d\u5efa<\/h3>\n<\/p>\n

\u7b2c\u4e00\u6b65\u662f\u642d\u5efaHTML\u9875\u9762\u7684\u57fa\u672c\u7ed3\u6784\u3002\u4e3a\u4e86\u4f53\u9a8c\u66f4\u597d\u7684\u7528\u6237\u4ea4\u4e92\uff0c\u901a\u5e38\u4f1a\u4f7f\u7528<select><\/code>\u5143\u7d20\u6765\u521b\u5efa\u4e0b\u62c9\u83dc\u5355\u3002<\/p>\n<\/p>\n

<select id="menu1"><\/p>\n
    <!-- \u9009\u9879\u5c06\u901a\u8fc7JavaScript\u52a8\u6001\u751f\u6210 --><\/p>\n
<\/select><\/p>\n
<select id="menu2" disabled><\/p>\n
    <!-- \u4f9d\u8d56\u4e8emenu1\u7684\u9009\u62e9\uff0c\u9009\u9879\u5c06\u901a\u8fc7JavaScript\u52a8\u6001\u751f\u6210 --><\/p>\n
<\/select><\/p>\n
<select id="menu3" disabled><\/p>\n
    <!-- \u4f9d\u8d56\u4e8emenu2\u7684\u9009\u62e9\uff0c\u9009\u9879\u5c06\u901a\u8fc7JavaScript\u52a8\u6001\u751f\u6210 --><\/p>\n
<\/select><\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u5b9a\u4e49\u6570\u636e\u548cDOM\u64cd\u4f5c<\/h3>\n<\/p>\n
\u5728JavaScript\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u6570\u636e\u7ed3\u6784\u6765\u8868\u793a\u5404\u7ea7\u83dc\u5355\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u8fd9\u53ef\u4ee5\u662f\u4e00\u4e2a\u5d4c\u5957\u7684\u5bf9\u8c61\u6216\u6570\u7ec4\u3002<\/p>\n<\/p>\n
const data = {<\/p>\n
    '\u54c1\u724cA': {<\/p>\n
        '\u4ea7\u54c11': ['\u578b\u53f71', '\u578b\u53f72'],<\/p>\n
        '\u4ea7\u54c12': ['\u578b\u53f73', '\u578b\u53f74']<\/p>\n
    },<\/p>\n
    '\u54c1\u724cB': {<\/p>\n
        '\u4ea7\u54c13': ['\u578b\u53f75', '\u578b\u53f76'],<\/p>\n
        '\u4ea7\u54c14': ['\u578b\u53f77', '\u578b\u53f78']<\/p>\n
    }<\/p>\n
    \/\/ \u66f4\u591a\u54c1\u724c\u4e0e\u4ea7\u54c1\u578b\u53f7<\/p>\n
};<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u63a5\u7740\uff0c\u6211\u4eec\u9700\u8981\u7f16\u5199\u51fd\u6570\u6765\u586b\u5145\u8fd9\u4e9b\u83dc\u5355\uff0c\u5e76\u5b9a\u4e49\u4e8b\u4ef6\u5904\u7406\u5668\u4ee5\u53cd\u5e94\u7528\u6237\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n
function populateMenu(menu, options) {<\/p>\n
    menu.innerHTML = '';<\/p>\n
    menu.appendChild(document.createElement('option')); \/\/ \u521b\u5efa\u9ed8\u8ba4\u7a7a\u9009\u9879<\/p>\n
    Object.keys(options).forEach(key => {<\/p>\n
        let opt = document.createElement('option');<\/p>\n
        opt.value = opt.textContent = key;<\/p>\n
        menu.appendChild(opt);<\/p>\n
    });<\/p>\n
}<\/p>\n
\/\/ \u7701\u7565\u586b\u5145\u521d\u59cb\u83dc\u5355\u7684\u4ee3\u7801<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u5b9e\u73b0\u4e0b\u62c9\u903b\u8f91<\/h3>\n<\/p>\n
\u5728\u7528\u6237\u9009\u62e9\u4e00\u4e2a\u83dc\u5355\u9879\u540e\uff0c\u540e\u7eed\u83dc\u5355\u5c06\u6839\u636e\u8fd9\u4e2a\u9009\u62e9\u88ab\u66f4\u65b0\u3002<\/p>\n<\/p>\n
document.getElementById('menu1').addEventListener('change', function() {<\/p>\n
    \/\/ \u6839\u636e\u9009\u62e9\u66f4\u65b0menu2<\/p>\n
});<\/p>\n
document.getElementById('menu2').addEventListener('change', function() {<\/p>\n
    \/\/ \u6839\u636e\u9009\u62e9\u66f4\u65b0menu3<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u5e94\u7528\u6837\u5f0f\u548c\u72b6\u6001\u53d8\u5316<\/h3>\n<\/p>\n
\u6700\u540e\u7684\u4e00\u6b65\u662f\u6839\u636e\u7528\u6237\u7684\u4e92\u52a8\u6765\u66f4\u65b0\u83dc\u5355\u7684\u6fc0\u6d3b\u72b6\u6001\u548c\u6837\u5f0f\u53d8\u5316<\/strong>\u3002\u6bcf\u5f53\u9009\u62e9\u4e86\u66f4\u9ad8\u7ea7\u522b\u7684\u83dc\u5355\u9009\u9879\u540e\uff0c\u9700\u8981\u542f\u7528\u4e0b\u4e00\u4e2a\u83dc\u5355\u5e76\u66f4\u65b0\u5176\u9009\u9879\u3002<\/p>\n<\/p>\n
document.getElementById('menu1').addEventListener('change', function() {<\/p>\n
    const menu2 = document.getElementById('menu2');<\/p>\n
    menu2.disabled = false; \/\/ \u542f\u7528menu2<\/p>\n
    \/\/ \u7701\u7565\u6839\u636emenu1\u7684\u9009\u62e9\u751f\u6210menu2\u9009\u9879\u7684\u4ee3\u7801<\/p>\n
});<\/p>\n
document.getElementById('menu2').addEventListener('change', function() {<\/p>\n
    const menu3 = document.getElementById('menu3');<\/p>\n
    menu3.disabled = false; \/\/ \u542f\u7528menu3<\/p>\n
    \/\/ \u7701\u7565\u6839\u636emenu2\u7684\u9009\u62e9\u751f\u6210menu3\u9009\u9879\u7684\u4ee3\u7801<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u603b\u7ed3\u8d77\u6765\uff0c\u901a\u8fc7JavaScript\u4e0eHTML\u8fdb\u884c\u4e92\u52a8\u521b\u5efa\u591a\u4e2a\u4e0b\u62c9\u83dc\u5355\u7684\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u5efa\u7acb\u6e05\u6670\u7684\u6570\u636e\u7ed3\u6784\u548c\u9009\u62e9\u903b\u8f91\uff0c\u5e76\u901a\u8fc7DOM\u64cd\u4f5c\u5b9e\u73b0\u7528\u6237\u754c\u9762\u4e0a\u7684\u8054\u52a8\u6548\u679c\u3002\u901a\u8fc7\u76d1\u542c\u4e8b\u4ef6\u548c\u64cd\u4f5c\u5143\u7d20\u5c5e\u6027\uff0c\u5b9e\u73b0\u83dc\u5355\u4e4b\u95f4\u7684\u52a8\u6001\u4ea4\u4e92\u3002\u4e0b\u4e00\u6b65\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u9610\u8ff0\u8fd9\u4e2a\u8fc7\u7a0b\u7684\u6bcf\u4e00\u6b65\uff0c\u5e76\u63d0\u4f9b\u5b8c\u6574\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u5982\u4f55\u521b\u5efa\u591a\u4e2a\u4e0b\u62c9\u83dc\u5355\uff1f<\/strong><\/p>\n
\u521b\u5efa\u591a\u4e2a\u4e0b\u62c9\u83dc\u5355\u7684\u65b9\u6cd5\u6709\u5f88\u591a\u79cd\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528JavaScript\u6765\u52a8\u6001\u5730\u751f\u6210HTML\u5143\u7d20\uff0c\u7136\u540e\u4e3a\u6bcf\u4e2a\u4e0b\u62c9\u83dc\u5355\u6dfb\u52a0\u4e8b\u4ef6\u76d1\u542c\u5668\u3002\u53e6\u5916\uff0c\u4f60\u8fd8\u53ef\u4ee5\u4f7f\u7528JavaScript\u5e93\u6216\u6846\u67b6\u6765\u7b80\u5316\u8fd9\u4e2a\u8fc7\u7a0b\u3002<\/p>\n
\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528JavaScript\u52a8\u6001\u751f\u6210\u4e0b\u62c9\u83dc\u5355\u3002\u4f60\u53ef\u4ee5\u6309\u4ee5\u4e0b\u6b65\u9aa4\u8fdb\u884c\u64cd\u4f5c\uff1a<\/strong><\/p>\n
    \n
  1. \u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684HTML\u9875\u9762\uff0c\u5e76\u5728\u6807\u7b7e\u4e2d\u5f15\u5165JavaScript\u6587\u4ef6\u3002<\/li>\n
  2. \u5728\u6807\u7b7e\u4e2d\u521b\u5efa\u4e00\u4e2a\u5bb9\u5668\u5143\u7d20\uff0c\u5982\n
    \u5143\u7d20\uff0c\u7528\u4e8e\u5b58\u653e\u4e0b\u62c9\u83dc\u5355\u3002<\/li>\n
  3. \u4f7f\u7528JavaScript\u4ee3\u7801\u521b\u5efa\u6807\u7b7e\uff0c\u5e76\u8bbe\u7f6e\u76f8\u5e94\u7684\u5c5e\u6027\uff0c\u5982id\u3001class\u3001name\u7b49\u3002<\/li>\n
  4. \u4f7f\u7528JavaScript\u4ee3\u7801\u521b\u5efa\u6807\u7b7e\uff0c\u5e76\u8bbe\u7f6e\u76f8\u5173\u7684\u5c5e\u6027\u548c\u6587\u672c\u5185\u5bb9\u3002\u4f60\u53ef\u4ee5\u6839\u636e\u9700\u8981\u521b\u5efa\u591a\u4e2a\u6807\u7b7e\uff0c\u4ee5\u53ca\u591a\u4e2a\u6807\u7b7e\u3002<\/li>\n
  5. \u5c06\u6807\u7b7e\u6dfb\u52a0\u5230\u5bb9\u5668\u5143\u7d20\u4e2d\uff0c\u4ee5\u6b64\u751f\u6210\u4e0b\u62c9\u83dc\u5355\u3002<\/li>\n
  6. \u4f7f\u7528JavaScript\u4ee3\u7801\u4e3a\u6bcf\u4e2a\u4e0b\u62c9\u83dc\u5355\u6dfb\u52a0\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u4ee5\u4fbf\u5728\u9009\u62e9\u4e0d\u540c\u7684\u9009\u9879\u65f6\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002<\/li>\n<\/ol>\n
    \u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528JavaScript\u5e93\u6216\u6846\u67b6\uff0c\u5982jQuery\u6216React\u3002<\/strong><\/p>\n
      \n
    1. \u9996\u5148\uff0c\u5c06\u6240\u9700\u7684JavaScript\u5e93\u6216\u6846\u67b6\u5f15\u5165\u5230HTML\u9875\u9762\u4e2d\u3002<\/li>\n
    2. \u4f7f\u7528\u76f8\u5e94\u7684\u5e93\u6216\u6846\u67b6\u63d0\u4f9b\u7684\u65b9\u6cd5\u6765\u521b\u5efa\u4e0b\u62c9\u83dc\u5355\u7ec4\u4ef6\u3002<\/li>\n
    3. \u6839\u636e\u5e93\u6216\u6846\u67b6\u7684\u6587\u6863\uff0c\u914d\u7f6e\u4e0b\u62c9\u83dc\u5355\u7684\u5c5e\u6027\u548c\u9009\u9879\u3002<\/li>\n
    4. \u5728\u9700\u8981\u7684\u4f4d\u7f6e\u4f7f\u7528\u63d0\u4f9b\u7684\u65b9\u6cd5\u5c06\u4e0b\u62c9\u83dc\u5355\u7ec4\u4ef6\u6e32\u67d3\u5230\u9875\u9762\u4e0a\u3002<\/li>\n<\/ol>\n
      \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u65e0\u8bba\u4f7f\u7528\u4f55\u79cd\u65b9\u6cd5\uff0c\u4f60\u90fd\u9700\u8981\u5904\u7406\u4e0b\u62c9\u83dc\u5355\u7684\u4e8b\u4ef6\uff0c\u4ee5\u4fbf\u5728\u7528\u6237\u9009\u62e9\u4e0d\u540c\u7684\u9009\u9879\u65f6\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7JavaScript\u4ee3\u7801\u6765\u5b9e\u73b0\u3002\u5e0c\u671b\u8fd9\u4e9b\u65b9\u6cd5\u5bf9\u4f60\u6709\u5e2e\u52a9\uff01<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"JavaScript \u5b9e\u73b0\u591a\u4e2a\u4e0b\u62c9\u83dc\u5355\u7684\u6838\u5fc3\u8981\u7d20\u5305\u62ec\u6784\u5efaDOM\u7ed3\u6784\u3001\u5b9a\u4e49\u4e0b\u62c9\u903b\u8f91\u3001\u5e94\u7528\u6837\u5f0f\u53d8\u5316\u3002\u4e00\u4e2a\u5178\u578b\u7684\u5b9e\u73b0 […]","protected":false},"author":3,"featured_media":235160,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/235151"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=235151"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/235151\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/235160"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=235151"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=235151"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=235151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}