{"id":296134,"date":"2024-05-20T15:53:52","date_gmt":"2024-05-20T07:53:52","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/296134.html"},"modified":"2024-05-20T15:54:04","modified_gmt":"2024-05-20T07:54:04","slug":"%e5%89%8d%e7%ab%af-js-%e5%a6%82%e4%bd%95%e6%9b%bf%e6%8d%a2%e6%a0%87%e7%ad%be%e5%b1%9e%e6%80%a7%e5%80%bc","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/296134.html","title":{"rendered":"\u524d\u7aef js \u5982\u4f55\u66ff\u6362\u6807\u7b7e\u5c5e\u6027\u503c"},"content":{"rendered":"

\"\u524d\u7aef<\/p>\n

JavaScript\u524d\u7aef\u4e2d\u66ff\u6362\u6807\u7b7e\u5c5e\u6027\u503c\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u5305\u62ec\u4f7f\u7528DOM\u64cd\u4f5c\u3001jQuery\u5e93\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u7b49\u3002<\/strong> \u6700\u5e38\u7528\u548c\u63a8\u8350\u7684\u662f\u901a\u8fc7DOM API\u6765\u76f4\u63a5\u64cd\u4f5c\u5143\u7d20\u7684\u5c5e\u6027\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528getElementById<\/code>\u6216querySelector<\/code>\u914d\u5408\u5c5e\u6027\u8bbf\u95ee\u5668\u4f8b\u5982element.attribute<\/code>\u6216\u8005setAttribute<\/code>\u65b9\u6cd5\u6765\u66f4\u6539\u7279\u5b9a\u6807\u7b7e\u7684\u5c5e\u6027\u503c\u3002jQuery\u5e93\u63d0\u4f9b\u4e86attr()<\/code>\u548cprop()<\/code>\u65b9\u6cd5\u4f7f\u5f97\u66ff\u6362\u66f4\u4e3a\u7b80\u5355\u3002\u5728\u67d0\u4e9b\u7279\u6b8a\u60c5\u51b5\u4e0b\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u6765\u5904\u7406\u6807\u7b7e\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n

\u5728\u57fa\u4e8eDOM API\u7684\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u901a\u5e38\u83b7\u53d6\u76ee\u6807\u5143\u7d20\u7684\u5f15\u7528\uff0c\u7136\u540e\u76f4\u63a5\u4fee\u6539\u5b83\u7684\u5c5e\u6027\u3002DOM \u65b9\u6cd5\u662f\u73b0\u4ee3\u524d\u7aef\u5f00\u53d1\u6700\u4e3a\u63a8\u8350\u7684\u65b9\u5f0f\uff0c\u56e0\u4e3a\u5b83\u66f4\u76f4\u89c2\u3001\u9ad8\u6548\uff0c\u5e76\u4e14\u6613\u4e8e\u7ef4\u62a4\u3002<\/p>\n<\/p>\n

\u4e00\u3001DOM \u65b9\u6cd5<\/h3>\n<\/p>\n

\u83b7\u53d6\u5143\u7d20\u548c\u8bbe\u7f6e\u5c5e\u6027<\/h4>\n<\/p>\n

\u9996\u5148\uff0c\u4f60\u9700\u8981\u83b7\u53d6\u5230\u8981\u64cd\u4f5c\u7684DOM\u5143\u7d20\u3002\u5047\u8bbe\u6211\u4eec\u8981\u4fee\u6539\u4e00\u4e2aimg<\/code>\u6807\u7b7e\u7684src<\/code>\u5c5e\u6027\uff1a<\/p>\n<\/p>\n

var image = document.getElementById('myImage');<\/p>\n
image.src = 'newImagePath.jpg';<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u91ccgetElementById<\/code>\u662f\u4e00\u4e2a\u5e38\u7528\u65b9\u6cd5\uff0c\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5177\u6709\u6307\u5b9aID\u7684\u5143\u7d20\u5bf9\u8c61\u3002\u4e4b\u540e\uff0c\u901a\u8fc7\u76f4\u63a5\u8bbf\u95eesrc<\/code>\u5c5e\u6027\u5e76\u8d4b\u4e88\u65b0\u7684\u503c\uff0c\u5373\u53ef\u66ff\u6362\u73b0\u6709\u7684\u5c5e\u6027\u503c\u3002<\/p>\n<\/p>\n
\u4f7f\u7528 setAttribute \u65b9\u6cd5<\/h4>\n<\/p>\n
\u53e6\u4e00\u79cd\u65b9\u5f0f\u662f\u4f7f\u7528setAttribute<\/code>\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
var image = document.getElementById('myImage');<\/p>\n
image.setAttribute('src', 'newImagePath.jpg');<\/p>\n
<\/code><\/pre>\n<\/p>\n
setAttribute<\/code>\u662f\u4e00\u4e2a\u66f4\u901a\u7528\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u6765\u8bbe\u7f6e\u4efb\u610f\u5c5e\u6027\uff0c\u5305\u62ec\u81ea\u5b9a\u4e49\u7684\u6570\u636e\u5c5e\u6027\u3002<\/p>\n<\/p>\n
\u4e8c\u3001jQuery \u65b9\u6cd5<\/h3>\n<\/p>\n
\u5982\u679c\u4f60\u5728\u9879\u76ee\u4e2d\u4f7f\u7528\u4e86jQuery\u5e93\uff0c\u90a3\u4e48\u66ff\u6362\u5c5e\u6027\u503c\u4f1a\u66f4\u7b80\u5355\uff1a<\/p>\n<\/p>\n
\u5e38\u89c4\u5c5e\u6027\u66ff\u6362<\/h4>\n<\/p>\n
\u4f7f\u7528attr()<\/code>\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
$('#myImage').attr('src', 'newImagePath.jpg');<\/p>\n
<\/code><\/pre>\n<\/p>\n
jQuery\u7684\u9009\u62e9\u5668$()<\/code>\u4f7f\u5f97\u9009\u62e9\u5143\u7d20\u66f4\u4e3a\u76f4\u63a5\uff0cattr()<\/code>\u65b9\u6cd5\u4e0e\u539f\u751fsetAttribute<\/code>\u65b9\u6cd5\u7c7b\u4f3c\uff0c\u4f46\u66f4\u52a0\u7075\u6d3b\u3002<\/p>\n<\/p>\n
\u5e03\u5c14\u5c5e\u6027\u66ff\u6362<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u5e03\u5c14\u5c5e\u6027\u5982checked<\/code>\u3001selected<\/code>\u6216\u8005disabled<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528prop()<\/code>\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
$('input').prop('checked', true);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4f1a\u5c06\u6240\u6709\u5339\u914d\u5230\u7684input<\/code>\u6807\u7b7e\u7684checked<\/code>\u5c5e\u6027\u8bbe\u7f6e\u4e3atrue\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u6b63\u5219\u8868\u8fbe\u5f0f\u65b9\u6cd5<\/h3>\n<\/p>\n
\u5728\u4e00\u4e9b\u6279\u5904\u7406\u6216\u4e0d\u76f4\u63a5\u64cd\u4f5cDOM\u7684\u573a\u666f\u4e0b\uff0c\u53ef\u80fd\u4f1a\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u6765\u66f4\u6539\u5c5e\u6027\u503c:<\/p>\n<\/p>\n
\u66ff\u6362\u7279\u5b9a\u5c5e\u6027\u503c<\/h4>\n<\/p>\n
\u4e0b\u4f8b\u5c06\u66f4\u6539\u6240\u6709img\u6807\u7b7e\u7684src\u5c5e\u6027\u503c\uff1a<\/p>\n<\/p>\n
var htmlString = '<img src="oldPath.jpg">';<\/p>\n
var newHtmlString = htmlString.replace(\/src="(.*?)"\/g, 'src="newImagePath.jpg"');<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u91cc\u6211\u4eec\u4f7f\u7528\u4e86replace()<\/code>\u65b9\u6cd5\uff0c\u5e76\u63d0\u4f9b\u4e86\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u641c\u7d22\u6a21\u5f0f\uff0c\u5b83\u4f1a\u5339\u914d\u6240\u6709\u7684src<\/code>\u5c5e\u6027\u5e76\u66ff\u6362\u5176\u503c\u3002<\/p>\n<\/p>\n
\u56db\u3001\u6ce8\u610f\u4e8b\u9879<\/h3>\n<\/p>\n
\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u66ff\u6362\u5c5e\u6027\u65f6\uff0c\u8981\u6ce8\u610f\u51e0\u4e2a\u91cd\u8981\u7684\u70b9<\/strong>\uff1a<\/p>\n<\/p>\n
    \n
  1. \u4fdd\u8bc1\u9009\u62e9\u5668\u51c6\u786e\u6027<\/strong>\uff1a\u5728\u9009\u62e9DOM\u5143\u7d20\u65f6\uff0c\u786e\u4fdd\u4f7f\u7528\u7684ID\u3001\u7c7b\u540d\u6216\u5176\u4ed6\u9009\u62e9\u5668\u662f\u552f\u4e00\u548c\u51c6\u786e\u7684\uff0c\u907f\u514d\u5f71\u54cd\u5230\u5176\u4ed6\u4e0d\u76f8\u5173\u7684\u5143\u7d20\u3002<\/li>\n
  2. \u7406\u89e3\u5c5e\u6027\u548c\u5c5e\u6027\u503c<\/strong>\uff1a\u4e86\u89e3HTML\u6807\u7b7e\u7684\u5c5e\u6027\u53ca\u5176\u5bf9\u5e94\u7684\u503c\u7684\u7c7b\u578b\u548c\u4f5c\u7528\uff0c\u6bd4\u5982\u94fe\u63a5\u5c5e\u6027href<\/code>\u7684\u503c\u5e94\u8be5\u662f\u6709\u6548\u7684URL\u3002<\/li>\n
  3. \u6027\u80fd\u8003\u8651<\/strong>\uff1a\u5728\u5bf9\u5927\u91cf\u5143\u7d20\u8fdb\u884c\u5c5e\u6027\u66ff\u6362\u65f6\uff0c\u5e94\u8be5\u8003\u8651\u5230\u6027\u80fd\u7684\u5f71\u54cd\uff0c\u6279\u91cf\u64cd\u4f5c\u524d\u5e94\u5f53\u8fdb\u884c\u5fc5\u8981\u7684\u6027\u80fd\u6d4b\u8bd5\u3002<\/li>\n<\/ol>\n
    \u7efc\u4e0a\u6240\u8ff0\uff0c\u66ff\u6362\u524d\u7aef\u6807\u7b7e\u7684\u5c5e\u6027\u503c\u53ef\u4ee5\u975e\u5e38\u7075\u6d3b\uff0c\u5e76\u6839\u636e\u9879\u76ee\u7684\u9700\u6c42\u548c\u73af\u5883\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u3002\u6700\u4f73\u5b9e\u8df5\u662f\u5c3d\u53ef\u80fd\u4f7f\u7528DOM\u65b9\u6cd5\u6765\u8bbf\u95ee\u548c\u4fee\u6539DOM\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4f9d\u8d56\u4e8e\u5916\u90e8\u5e93\uff0c\u540c\u65f6\u4e3a\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff0c\u5efa\u8bae\u4f7f\u7528\u6e05\u6670\u548c\u8bed\u4e49\u5316\u7684\u4ee3\u7801\u7f16\u5199\u65b9\u5f0f\u3002<\/p>\n<\/p>\n
    \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
    1. \u5982\u4f55\u4f7f\u7528 JavaScript \u66ff\u6362 HTML \u6807\u7b7e\u7684\u5c5e\u6027\u503c\uff1f<\/strong><\/p>\n
    \u5f53\u9700\u8981\u66ff\u6362 HTML \u6807\u7b7e\u7684\u5c5e\u6027\u503c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 JavaScript \u6765\u5b9e\u73b0\u3002\u53ef\u4ee5\u901a\u8fc7\u83b7\u53d6\u6807\u7b7e\u5bf9\u8c61\uff0c\u5e76\u4f7f\u7528 setAttribute<\/code> \u65b9\u6cd5\u6765\u4fee\u6539\u5c5e\u6027\u503c\u3002\u5177\u4f53\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n
      \n
    • \u4f7f\u7528 document.querySelector<\/code> \u6216 document.getElementById<\/code> \u65b9\u6cd5\u83b7\u53d6\u9700\u8981\u4fee\u6539\u5c5e\u6027\u7684\u6807\u7b7e\u5bf9\u8c61\u3002<\/li>\n
    • \u4f7f\u7528 setAttribute<\/code> \u65b9\u6cd5\u4fee\u6539\u5c5e\u6027\u503c\uff0c\u53c2\u6570\u4e3a\u9700\u8981\u4fee\u6539\u7684\u5c5e\u6027\u540d\u79f0\u548c\u65b0\u7684\u5c5e\u6027\u503c\u3002<\/li>\n<\/ul>\n
      \u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
      \/\/ \u83b7\u53d6\u9700\u8981\u4fee\u6539\u5c5e\u6027\u7684\u5143\u7d20\nlet element = document.querySelector("#myElement");\n\n\/\/ \u4fee\u6539\u5c5e\u6027\u503c\nelement.setAttribute("src", "new-image.jpg");\n<\/code><\/pre>\n
      2. \u5982\u4f55\u4f7f\u7528 JavaScript \u66ff\u6362\u6807\u7b7e\u7684\u591a\u4e2a\u5c5e\u6027\u503c\uff1f<\/strong><\/p>\n
      \u5982\u679c\u9700\u8981\u540c\u65f6\u66ff\u6362\u6807\u7b7e\u7684\u591a\u4e2a\u5c5e\u6027\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528 JavaScript \u4e2d\u7684\u5bf9\u8c61\u6765\u5b58\u50a8\u5c5e\u6027\u548c\u5bf9\u5e94\u7684\u65b0\u503c\u3002\u7136\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528 Object.entries<\/code> \u65b9\u6cd5\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a\u6570\u7ec4\uff0c\u5e76\u5faa\u73af\u904d\u5386\u6570\u7ec4\uff0c\u4f7f\u7528 setAttribute<\/code> \u65b9\u6cd5\u6765\u9010\u4e2a\u4fee\u6539\u5c5e\u6027\u503c\u3002\u5177\u4f53\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n
        \n
      • \u521b\u5efa\u4e00\u4e2a\u5b58\u50a8\u9700\u8981\u4fee\u6539\u7684\u5c5e\u6027\u548c\u65b0\u503c\u7684\u5bf9\u8c61\u3002<\/li>\n
      • \u4f7f\u7528 Object.entries<\/code> \u65b9\u6cd5\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002<\/li>\n
      • \u904d\u5386\u6570\u7ec4\uff0c\u5e76\u4f7f\u7528 setAttribute<\/code> \u65b9\u6cd5\u9010\u4e2a\u4fee\u6539\u5c5e\u6027\u503c\u3002<\/li>\n<\/ul>\n
        \u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
        \/\/ \u521b\u5efa\u5b58\u50a8\u5c5e\u6027\u548c\u65b0\u503c\u7684\u5bf9\u8c61\nlet attributes = {\n  src: "new-image.jpg",\n  alt: "New image",\n  title: "New image"\n};\n\n\/\/ \u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a\u6570\u7ec4\u5e76\u904d\u5386\nObject.entries(attributes).forEach(([key, value]) => {\n  \/\/ \u83b7\u53d6\u9700\u8981\u4fee\u6539\u5c5e\u6027\u7684\u5143\u7d20\n  let element = document.querySelector("#myElement");\n  \n  \/\/ \u4fee\u6539\u5c5e\u6027\u503c\n  element.setAttribute(key, value);\n});\n<\/code><\/pre>\n
        3. \u5982\u4f55\u4f7f\u7528 JavaScript \u66ff\u6362\u6307\u5b9a\u7c7b\u540d\u7684\u6807\u7b7e\u7684\u5c5e\u6027\u503c\uff1f<\/strong><\/p>\n
        \u5982\u679c\u9700\u8981\u4ec5\u66ff\u6362\u6307\u5b9a\u7c7b\u540d\u7684\u6807\u7b7e\u7684\u5c5e\u6027\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528 document.getElementsByClassName<\/code> \u65b9\u6cd5\u83b7\u53d6\u6307\u5b9a\u7c7b\u540d\u7684\u6807\u7b7e\u96c6\u5408\u3002\u7136\u540e\uff0c\u5faa\u73af\u904d\u5386\u8be5\u96c6\u5408\uff0c\u5e76\u4f7f\u7528 setAttribute<\/code> \u65b9\u6cd5\u4fee\u6539\u5c5e\u6027\u503c\u3002\u5177\u4f53\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n
          \n
        • \u4f7f\u7528 document.getElementsByClassName<\/code> \u65b9\u6cd5\u83b7\u53d6\u6307\u5b9a\u7c7b\u540d\u7684\u6807\u7b7e\u96c6\u5408\u3002<\/li>\n
        • \u904d\u5386\u6807\u7b7e\u96c6\u5408\uff0c\u5e76\u4f7f\u7528 setAttribute<\/code> \u65b9\u6cd5\u9010\u4e2a\u4fee\u6539\u5c5e\u6027\u503c\u3002<\/li>\n<\/ul>\n
          \u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n
          \/\/ \u83b7\u53d6\u6307\u5b9a\u7c7b\u540d\u7684\u6807\u7b7e\u96c6\u5408\nlet elements = document.getElementsByClassName("myClass");\n\n\/\/ \u904d\u5386\u6807\u7b7e\u96c6\u5408\u5e76\u4fee\u6539\u5c5e\u6027\u503c\nArray.from(elements).forEach(element => {\n  element.setAttribute("src", "new-image.jpg");\n});\n<\/code><\/pre>\n
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