{"id":169698,"date":"2024-05-08T16:51:33","date_gmt":"2024-05-08T08:51:33","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/169698.html"},"modified":"2024-05-08T16:51:39","modified_gmt":"2024-05-08T08:51:39","slug":"javascript-%e7%bb%93%e5%90%88-html-dom-%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%e8%81%94%e5%8a%a8%e8%8f%9c%e5%8d%95","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/169698.html","title":{"rendered":"JavaScript \u7ed3\u5408 HTML DOM \u5982\u4f55\u5b9e\u73b0\u8054\u52a8\u83dc\u5355"},"content":{"rendered":"

\"JavaScript<\/p>\n

JavaScript\u7ed3\u5408HTML DOM\u53ef\u4ee5\u901a\u8fc7\u76d1\u542c\u4e8b\u4ef6\u3001\u64cd\u4f5cDOM\u5143\u7d20\u3001\u6570\u636e\u7ed1\u5b9a\u4e0e\u72b6\u6001\u7ba1\u7406<\/strong>\u7b49\u65b9\u5f0f\u5b9e\u73b0\u8054\u52a8\u83dc\u5355\u3002\u8fd9\u7c7b\u83dc\u5355\u901a\u5e38\u9700\u8981\u57fa\u4e8e\u7528\u6237\u7684\u64cd\u4f5c\u6765\u66f4\u65b0\u9009\u9879\uff0c\u5c55\u73b0\u52a8\u6001\u7684\u4ea4\u4e92\u6548\u679c\u3002\u76d1\u542c\u4e8b\u4ef6<\/strong>\u662f\u5b9e\u73b0\u8fd9\u4e00\u529f\u80fd\u7684\u6838\u5fc3\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u6355\u6349\u5230\u7528\u6237\u7684\u884c\u4e3a\uff0c\u5982\u70b9\u51fb\u6216\u9009\u62e9\uff0c\u4ece\u800c\u89e6\u53d1\u76f8\u5e94\u7684DOM\u64cd\u4f5c\u6765\u66f4\u65b0\u83dc\u5355\u5185\u5bb9\u3002<\/p>\n<\/p>\n

\u4ee5\u76d1\u542c\u4e8b\u4ef6<\/strong>\u4e3a\u4f8b\uff0c\u5f53\u7528\u6237\u5728\u7b2c\u4e00\u4e2a\u4e0b\u62c9\u83dc\u5355\u4e2d\u9009\u62e9\u4e00\u4e2a\u9009\u9879\u65f6\uff0cJavaScript\u4ee3\u7801\u53ef\u4ee5\u76d1\u542c\u8fd9\u4e00\u9009\u62e9\u4e8b\u4ef6\uff0c\u5e76\u6839\u636e\u7528\u6237\u7684\u9009\u62e9\u52a8\u6001\u5730\u66f4\u65b0\u7b2c\u4e8c\u4e2a\u4e0b\u62c9\u83dc\u5355\u4e2d\u7684\u9009\u9879\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u901a\u5e38\u6d89\u53ca\u5230\u8bbf\u95ee\u548c\u4fee\u6539HTML DOM\u4e2d\u7684\u5143\u7d20\uff0c\u5982\u83b7\u53d6\u7528\u6237\u5728\u7b2c\u4e00\u4e2a\u83dc\u5355\u4e2d\u9009\u62e9\u7684\u503c\uff0c\u7136\u540e\u57fa\u4e8e\u8fd9\u4e2a\u503c\u6765\u51b3\u5b9a\u7b2c\u4e8c\u4e2a\u83dc\u5355\u5e94\u663e\u793a\u54ea\u4e9b\u9009\u9879\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u76d1\u542c\u4e8b\u4ef6<\/h3>\n<\/p>\n

\u76d1\u542c\u4e8b\u4ef6\u662f\u8054\u52a8\u83dc\u5355\u5b9e\u73b0\u4e2d\u7684\u9996\u8981\u6b65\u9aa4\u3002\u901a\u8fc7\u5bf9\u7528\u6237\u64cd\u4f5c\u7684\u76d1\u542c\uff0cJavaScript\u53ef\u4ee5\u6267\u884c\u540e\u7eed\u7684DOM\u64cd\u4f5c\u4ee5\u66f4\u65b0\u83dc\u5355\u3002\u9996\u5148\uff0c\u9700\u8981\u901a\u8fc7JavaScript\u4e3a\u7b2c\u4e00\u4e2a\u83dc\u5355\u6dfb\u52a0\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u4ee5\u4fbf\u5728\u7528\u6237\u505a\u51fa\u9009\u62e9\u65f6\u89e6\u53d1\u7279\u5b9a\u7684\u51fd\u6570\u3002\u8fd9\u4e2a\u51fd\u6570\u5c06\u6839\u636e\u7528\u6237\u7684\u9009\u62e9\u6765\u66f4\u65b0\u7b2c\u4e8c\u4e2a\u83dc\u5355\u7684\u5185\u5bb9\u3002<\/p>\n<\/p>\n

document.getElementById("firstMenu").addEventListener("change", function() {<\/p>\n
    var userSelection = this.value;<\/p>\n
    updateSecondMenu(userSelection);<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u8ff0\u4ee3\u7801\u6f14\u793a\u4e86\u5982\u4f55\u4e3aID\u4e3afirstMenu<\/code>\u7684DOM\u5143\u7d20\u6dfb\u52a0\u4e00\u4e2achange<\/code>\u4e8b\u4ef6\u76d1\u542c\u5668\u3002\u5f53\u7528\u6237\u6539\u53d8\u9009\u62e9\u65f6\uff0c\u4f1a\u6267\u884c\u4e00\u4e2a\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u83b7\u53d6\u7528\u6237\u9009\u62e9\u7684\u503c\uff0c\u5e76\u8c03\u7528updateSecondMenu<\/code>\u51fd\u6570\u6765\u6839\u636e\u8fd9\u4e2a\u503c\u66f4\u65b0\u7b2c\u4e8c\u4e2a\u83dc\u5355\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u64cd\u4f5cDOM\u5143\u7d20<\/h3>\n<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u9700\u8981\u64cd\u4f5cDOM\u5143\u7d20\u4ee5\u6839\u636e\u7b2c\u4e00\u4e2a\u83dc\u5355\u7684\u9009\u62e9\u66f4\u65b0\u7b2c\u4e8c\u4e2a\u83dc\u5355\u7684\u9009\u9879\u3002\u8fd9\u901a\u5e38\u6d89\u53ca\u5230\u6e05\u9664\u7b2c\u4e8c\u4e2a\u83dc\u5355\u5f53\u524d\u7684\u6240\u6709\u9009\u9879\uff0c\u7136\u540e\u6839\u636e\u7b2c\u4e00\u4e2a\u83dc\u5355\u7684\u9009\u62e9\u6dfb\u52a0\u65b0\u7684\u9009\u9879\u3002<\/p>\n<\/p>\n
function updateSecondMenu(userSelection) {<\/p>\n
    var secondMenu = document.getElementById("secondMenu");<\/p>\n
    secondMenu.innerHTML = ''; \/\/ \u6e05\u7a7a\u83dc\u5355\u9879<\/p>\n
    var options = getOptionsBasedOnSelection(userSelection); \/\/ \u6839\u636e\u9009\u62e9\u83b7\u53d6\u65b0\u7684\u83dc\u5355\u9879<\/p>\n
    options.forEach(function(option) {<\/p>\n
        var optionElement = document.createElement("option");<\/p>\n
        optionElement.value = option.value;<\/p>\n
        optionElement.text = option.text;<\/p>\n
        secondMenu.appendChild(optionElement);<\/p>\n
    });<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728updateSecondMenu<\/code>\u51fd\u6570\u4e2d\uff0c\u9996\u5148\u83b7\u53d6\u7b2c\u4e8c\u4e2a\u83dc\u5355\u7684DOM\u5143\u7d20\uff0c\u7136\u540e\u6e05\u7a7a\u5176\u5185\u5bb9\u3002\u4e4b\u540e\uff0c\u6839\u636e\u7b2c\u4e00\u4e2a\u83dc\u5355\u7684\u7528\u6237\u9009\u62e9\u6765\u83b7\u53d6\u65b0\u7684\u9009\u9879\uff08\u8fd9\u91cc\u5047\u5b9agetOptionsBasedOnSelection<\/code>\u51fd\u6570\u53ef\u4ee5\u6839\u636e\u7528\u6237\u7684\u9009\u62e9\u8fd4\u56de\u76f8\u5e94\u7684\u9009\u9879\u6570\u7ec4\uff09\uff0c\u6700\u540e\u904d\u5386\u8fd9\u4e9b\u9009\u9879\uff0c\u5e76\u5c06\u5b83\u4eec\u4f5c\u4e3a\u65b0\u7684\u83dc\u5355\u9879\u6dfb\u52a0\u5230\u7b2c\u4e8c\u4e2a\u83dc\u5355\u4e2d\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u6570\u636e\u7ed1\u5b9a\u4e0e\u72b6\u6001\u7ba1\u7406<\/h3>\n<\/p>\n
\u4e3a\u4e86\u63d0\u9ad8\u8054\u52a8\u83dc\u5355\u7684\u54cd\u5e94\u901f\u5ea6\u548c\u7528\u6237\u4f53\u9a8c\uff0c\u53ef\u4ee5\u91c7\u7528\u6570\u636e\u7ed1\u5b9a\u548c\u72b6\u6001\u7ba1\u7406\u7684\u65b9\u5f0f\u3002\u5f53\u5e94\u7528\u7684\u72b6\u6001\u66f4\u65b0\u65f6\uff0c\u5373\u7528\u6237\u7684\u9009\u62e9\u6539\u53d8\uff0c\u83dc\u5355\u81ea\u52a8\u53cd\u6620\u8fd9\u4e9b\u53d8\u5316\uff0c\u800c\u4e0d\u662f\u624b\u52a8\u64cd\u4f5cDOM\u3002\u73b0\u4ee3\u524d\u7aef\u6846\u67b6\u5982React\u3001Vue\u7b49\u63d0\u4f9b\u4e86\u66f4\u52a0\u9ad8\u6548\u548c\u7b80\u6d01\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u8fd9\u79cd\u6a21\u5f0f\u3002<\/p>\n<\/p>\n
\u56db\u3001\u9ad8\u7ea7\u4ea4\u4e92\u5b9e\u73b0<\/h3>\n<\/p>\n
\u9664\u4e86\u57fa\u672c\u7684\u8054\u52a8\u83dc\u5355\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7JavaScript\u548cHTML DOM\u5b9e\u73b0\u66f4\u4e3a\u590d\u6742\u7684\u4ea4\u4e92\u6548\u679c\uff0c\u5982\u7ea7\u8054\u83dc\u5355\u3001\u52a8\u6001\u83dc\u5355\u52a0\u8f7d\u7b49\u3002\u8fd9\u4e9b\u9ad8\u7ea7\u529f\u80fd\u53ef\u80fd\u9700\u8981\u7ed3\u5408AJAX\u3001\u524d\u7aef\u8def\u7531\u3001\u590d\u6742\u7684\u72b6\u6001\u7ba1\u7406\u7b49\u6280\u672f\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
\u603b\u4e4b\uff0c\u901a\u8fc7JavaScript\u548cHTML DOM\u7684\u7ed3\u5408\u4f7f\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u7075\u6d3b\u5730\u5b9e\u73b0\u8054\u52a8\u83dc\u5355\u53ca\u5404\u79cd\u52a8\u6001\u4ea4\u4e92\u529f\u80fd\uff0c\u63d0\u5347\u7f51\u9875\u7684\u7528\u6237\u4f53\u9a8c\u3002\u501f\u52a9\u4e8e\u73b0\u4ee3\u524d\u7aef\u6846\u67b6\u548c\u5e93\uff0c\u5f00\u53d1\u8005\u80fd\u591f\u4ee5\u66f4\u52a0\u9ad8\u6548\u548c\u7b80\u6d01\u7684\u65b9\u5f0f\u521b\u5efa\u51fa\u54cd\u5e94\u8fc5\u901f\u3001\u7528\u6237\u53cb\u597d\u7684\u4ea4\u4e92\u754c\u9762\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u5982\u4f55\u5229\u7528 JavaScript \u548c HTML DOM \u5b9e\u73b0\u8054\u52a8\u83dc\u5355\uff1f<\/strong><\/p>\n
    \n
  1. \n
    \u4ec0\u4e48\u662f HTML DOM\uff1f<\/strong> HTML DOM\uff08\u6587\u6863\u5bf9\u8c61\u6a21\u578b\uff09\u662f\u7528\u4e8e\u5904\u7406 HTML \u6587\u6863\u7684\u7f16\u7a0b\u63a5\u53e3\uff0c\u5b83\u5141\u8bb8 JavaScript \u811a\u672c\u901a\u8fc7\u64cd\u4f5c HTML \u5143\u7d20\u6765\u6539\u53d8\u7f51\u9875\u7684\u5185\u5bb9\u3001\u7ed3\u6784\u548c\u6837\u5f0f\u3002<\/p>\n<\/li>\n
  2. \n
    \u5982\u4f55\u521b\u5efa\u8054\u52a8\u83dc\u5355\uff1f<\/strong> \u9996\u5148\uff0c\u5728 HTML \u4e2d\u521b\u5efa\u4e24\u4e2a\u6216\u591a\u4e2a <select><\/code> \u5143\u7d20\uff0c\u901a\u8fc7\u7ed9\u6bcf\u4e2a <select><\/code> \u5143\u7d20\u6dfb\u52a0 onchange<\/code> \u5c5e\u6027\uff0c\u6307\u5b9a\u5f53\u83dc\u5355\u9009\u62e9\u9879\u6539\u53d8\u65f6\u8981\u89e6\u53d1\u7684 JavaScript \u51fd\u6570\u3002\u7136\u540e\uff0c\u4f7f\u7528 JavaScript \u83b7\u53d6\u9009\u4e2d\u7684\u9009\u9879\u503c\u5e76\u6839\u636e\u5176\u503c\u52a8\u6001\u751f\u6210\u4e0b\u4e00\u4e2a\u83dc\u5355\u7684\u9009\u9879\u3002<\/p>\n<\/li>\n
  3. \n
    \u5982\u4f55\u4f7f\u7528 JavaScript \u6539\u53d8\u83dc\u5355\u9009\u9879\uff1f<\/strong> \u5728 JavaScript \u51fd\u6570\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 document.getElementById<\/code> \u6216\u5176\u4ed6 DOM \u65b9\u6cd5\u83b7\u53d6\u5230\u83dc\u5355\u9009\u62e9\u7684\u503c\uff0c\u5e76\u6839\u636e\u4e0d\u540c\u7684\u503c\u6765\u52a8\u6001\u751f\u6210\u4e0b\u4e00\u4e2a\u83dc\u5355\u7684\u9009\u9879\u3002\u53ef\u4ee5\u4f7f\u7528 innerHTML<\/code> \u5c5e\u6027\u4fee\u6539\u83dc\u5355\u7684\u9009\u9879\u5185\u5bb9\uff0c\u6216\u8005\u4f7f\u7528 appendChild<\/code> \u65b9\u6cd5\u52a8\u6001\u6dfb\u52a0\u65b0\u7684\u9009\u9879\u5230\u83dc\u5355\u4e2d\u3002<\/p>\n<\/li>\n<\/ol>\n
    \u5982\u4f55\u5b9e\u73b0\u8054\u52a8\u83dc\u5355\u7684\u6570\u636e\u6e90\uff1f<\/strong><\/p>\n
      \n
    1. \n
      \u5982\u4f55\u83b7\u53d6\u8054\u52a8\u83dc\u5355\u7684\u6570\u636e\uff1f<\/strong> \u8054\u52a8\u83dc\u5355\u7684\u6570\u636e\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u83b7\u53d6\uff0c\u6bd4\u5982\u901a\u8fc7\u540e\u7aef API \u63a5\u53e3\u8bf7\u6c42\u83b7\u53d6\u6570\u636e\u3001\u76f4\u63a5\u5728\u524d\u7aef\u4f7f\u7528\u9759\u6001\u6570\u636e\u3001\u6216\u8005\u4f7f\u7528 AJAX \u5f02\u6b65\u8bf7\u6c42\u83b7\u53d6\u6570\u636e\u3002\u6839\u636e\u5177\u4f53\u60c5\u51b5\u9009\u62e9\u5408\u9002\u7684\u65b9\u5f0f\u6765\u83b7\u53d6\u83dc\u5355\u6570\u636e\u3002<\/p>\n<\/li>\n
    2. \n
      \u5982\u4f55\u5904\u7406\u83dc\u5355\u6570\u636e\uff1f<\/strong> \u83b7\u53d6\u5230\u83dc\u5355\u6570\u636e\u540e\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u5b58\u50a8\u5728 JavaScript \u5bf9\u8c61\u3001\u6570\u7ec4\u6216\u5176\u4ed6\u6570\u636e\u7ed3\u6784\u4e2d\u3002\u53ef\u4ee5\u6839\u636e\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u9884\u5904\u7406\u3001\u7b5b\u9009\u3001\u6392\u5e8f\u7b49\u64cd\u4f5c\uff0c\u5e76\u6839\u636e\u6570\u636e\u751f\u6210\u83dc\u5355\u7684\u9009\u9879\u5e76\u52a8\u6001\u66f4\u65b0\u3002<\/p>\n<\/li>\n
    3. \n
      \u5982\u4f55\u6839\u636e\u8054\u52a8\u83dc\u5355\u7684\u9009\u62e9\u6570\u636e\u6765\u66f4\u65b0\u5176\u4ed6\u5185\u5bb9\uff1f<\/strong> \u9664\u4e86\u52a8\u6001\u66f4\u65b0\u83dc\u5355\u7684\u9009\u9879\uff0c\u8fd8\u53ef\u4ee5\u6839\u636e\u8054\u52a8\u83dc\u5355\u7684\u9009\u62e9\u6570\u636e\u6765\u66f4\u65b0\u5176\u4ed6\u5185\u5bb9\u3002\u6bd4\u5982\uff0c\u53ef\u4ee5\u6839\u636e\u9009\u62e9\u7684\u5730\u533a\u6765\u663e\u793a\u76f8\u5e94\u7684\u5546\u54c1\u5217\u8868\uff0c\u6216\u8005\u6839\u636e\u9009\u62e9\u7684\u65e5\u671f\u6765\u663e\u793a\u5f53\u5929\u7684\u6d3b\u52a8\u65e5\u7a0b\u7b49\u3002\u901a\u8fc7\u76d1\u542c\u83dc\u5355\u7684 onchange \u4e8b\u4ef6\uff0c\u5e76\u5728\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d\u6839\u636e\u9009\u62e9\u7684\u6570\u636e\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u5373\u53ef\u5b9e\u73b0\u8054\u52a8\u6548\u679c\u3002<\/p>\n<\/li>\n<\/ol>\n
      \u8054\u52a8\u83dc\u5355\u7684\u5e38\u89c1\u95ee\u9898\u548c\u89e3\u51b3\u65b9\u6cd5<\/strong><\/p>\n
        \n
      1. \n
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