{"id":53414,"date":"2024-12-03T14:08:14","date_gmt":"2024-12-03T06:08:14","guid":{"rendered":"https:\/\/fwq.ai\/blog\/53414\/"},"modified":"2024-12-03T14:08:14","modified_gmt":"2024-12-03T06:08:14","slug":"filereader%e5%ae%9e%e4%be%8b%e5%8c%96%ef%bc%9a%e4%b8%ba%e4%bd%95%e8%a6%81%e5%85%88%e5%88%9b%e5%bb%ba%e5%af%b9%e8%b1%a1%e5%86%8d%e8%bf%9b%e8%a1%8c%e6%96%87%e4%bb%b6%e8%af%bb%e5%8f%96%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/53414\/","title":{"rendered":"FileReader\u5b9e\u4f8b\u5316\uff1a\u4e3a\u4f55\u8981\u5148\u521b\u5efa\u5bf9\u8c61\u518d\u8fdb\u884c\u6587\u4ef6\u8bfb\u53d6\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

FileReader\u5b9e\u4f8b\u5316\uff1a\u4e3a\u4f55\u8981\u5148\u521b\u5efa\u5bf9\u8c61\u518d\u8fdb\u884c\u6587\u4ef6\u8bfb\u53d6\uff1f<\/h1>\n

\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u6253\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\u300aFileReader\u5b9e\u4f8b\u5316\uff1a\u4e3a\u4f55\u8981\u5148\u521b\u5efa\u5bf9\u8c61\u518d\u8fdb\u884c\u6587\u4ef6\u8bfb\u53d6\uff1f\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\u5427\uff01\u6587\u4e2d\u5185\u5bb9\u5305\u542b<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9…\u5e0c\u671b\u4f60\u80fd\u5728\u9605\u8bfb\u672c\u6587\u540e\uff0c\u80fd\u771f\u771f\u5b9e\u5b9e\u5b66\u5230\u77e5\u8bc6\u6216\u8005\u5e2e\u4f60\u89e3\u51b3\u5fc3\u4e2d\u7684\u7591\u60d1\uff0c\u4e5f\u6b22\u8fce\u5927\u4f6c\u6216\u8005\u65b0\u4eba\u670b\u53cb\u4eec\u591a\u7559\u8a00\u8bc4\u8bba\uff0c\u591a\u7ed9\u5efa\u8bae\uff01\u8c22\u8c22\uff01<\/p>\n

\"FileReader\u5b9e\u4f8b\u5316\uff1a\u4e3a\u4f55\u8981\u5148\u521b\u5efa\u5bf9\u8c61\u518d\u8fdb\u884c\u6587\u4ef6\u8bfb\u53d6\uff1f\u63d2\u56fe\"<\/p>\n

\u8bfb\u53d6\u6587\u4ef6\u7684 io \u64cd\u4f5c\u4e3a\u4f55\u8981\u5148\u5b9e\u4f8b\u5316 filereader\uff1f<\/strong><\/p>\n

\u5f53\u4f7f\u7528 html \u5143\u7d20 <input type=”file”> filereader \u5b9e\u4f8b\uff0c\u7136\u540e\u901a\u8fc7\u5176\u65b9\u6cd5\u6765\u5904\u7406\u6587\u4ef6\u3002\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0c\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u76f4\u63a5\u5c06\u6587\u4ef6\u4f20\u9012\u7ed9 filereader \u6784\u9020\u51fd\u6570\uff0c\u4f46\u4e3a\u4ec0\u4e48\u8981\u5148\u521b\u5efa\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u7136\u540e\u518d\u505a\u4e00\u4e9b\u4e8b\u60c5\u5462\uff1f<\/p>\n

\u521b\u5efa filereader \u5b9e\u4f8b\u7684\u539f\u56e0<\/strong><\/p>\n

filereader \u5b9e\u4f8b\u5316\u5141\u8bb8\u6211\u4eec\u6269\u5c55\u6587\u4ef6\u5904\u7406\u903b\u8f91\u3002<\/p>\n

\u4f8b\u5982\uff0c\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n

const filereader = new filereader();\nfilereader.readastext(file);\nfilereader.addeventlistener('load', () => {\n  console.log(filereader.result);\n});<\/pre>\n
\u5047\u8bbe\u6b64\u540e\u6211\u4eec\u6536\u5230\u6587\u4ef6\u592a\u5927\u5e76\u4e14\u8bfb\u53d6\u7684\u53cd\u9988\u8fc7\u7a0b\u9700\u8981\u5f88\u957f\u65f6\u95f4\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u7ed9\u5b9a filereader \u5b9e\u4f8b\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u6dfb\u52a0\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u6765\u8ddf\u8e2a\u8fdb\u5ea6\u3002<\/p>\n
const filereader = new filereader();\nfilereader.readastext(file);\nfilereader.addeventlistener('load', () => {\n  console.log(filereader.result);\n});\n\n\/\/ \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043e\nfilereader.addeventlistener('progress', (ev) => {\n  console.log(`\u0417\u0430\u0433\u0440\u0443\u0436\u0435\u043d\u043e ${ev.loaded} \u0438\u0437 ${ev.total}`);\n});<\/pre>\n
\u5982\u679c\u6211\u4eec\u7a0d\u540e\u9700\u8981\u6dfb\u52a0\u4e2d\u6b62\u4e0b\u8f7d\u6309\u94ae\uff0c\u6211\u4eec\u53ef\u4ee5\u518d\u6b21\u4f7f\u7528 filereader \u5b9e\u4f8b\u5e76\u8c03\u7528 abort( ) \u65b9\u6cd5\u6765\u4e2d\u6b62\u8bfb\u53d6\u8fc7\u7a0b\u3002<\/p>\n
const filereader = new filereader();\nfilereader.readastext(file);\nfilereader.addeventlistener('load', () => {\n  console.log(filereader.result);\n});\n\n\/\/ \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043e\nfilereader.addeventlistener('progress', (ev) => {\n  console.log(`\u0417\u0430\u0433\u0440\u0443\u0436\u0435\u043d\u043e ${ev.loaded} \u0438\u0437 ${ev.total}`);\n});\n\n\/\/ \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043e\ncancel.addeventlistener('click', () => {\n  filereader.abort();\n}, { once: true });<\/pre>\n
\u56e0\u6b64\u5b9e\u4f8b\u5316 filereader \u53ef\u4ee5\u8ba9\u6211\u4eec\u66f4\u7075\u6d3b\u5730\u4f7f\u7528\u5176\u65b9\u6cd5\uff0c\u5e76\u5141\u8bb8\u6211\u4eec\u505a\u66f4\u591a\u4e8b\u60c5\u3002<\/p>\n
\u4e3a\u4ec0\u4e48\u6211\u4eec\u4e0d\u80fd\u4f20\u9012\u4e00\u4e2a\u6587\u4ef6\u76f4\u63a5\u4f20\u9012\u7ed9 filereader \u6784\u9020\u51fd\u6570\uff1f<\/strong><\/p>\n
\u5728 java \u7b49\u8bed\u8a00\u4e2d\uff0c\u7c7b\u6784\u9020\u51fd\u6570\u53ef\u4ee5\u91c7\u7528\u53c2\u6570\u6765\u521d\u59cb\u5316\u5bf9\u8c61\u3002\u7136\u800c\uff0c\u5728 javascript \u4e2d\uff0c\u521b\u5efa\u7c7b\u7684\u5b9e\u4f8b\uff0c\u7136\u540e\u5c06\u53c2\u6570\u4f20\u9012\u7ed9\u5b83\u6765\u6267\u884c\u64cd\u4f5c\u662f\u5f88\u5e38\u89c1\u7684\u3002<\/p>\n
\u6709\u4e9b\u4eba\u8ba4\u4e3a\u521b\u5efa\u5b9e\u4f8b\u5e76\u968f\u540e\u7acb\u5373\u8c03\u7528\u65b9\u6cd5\u53ef\u80fd\u4f1a\u5bfc\u81f4\u52a0\u8f7d\u6587\u4ef6\u65f6\u51fa\u73b0\u6df7\u4e71\u5728\u6784\u9020\u51fd\u6570\u4e2d\u3002\u5c06\u5b9e\u4f8b\u5316\u4e0e\u65b9\u6cd5\u8c03\u7528\u5206\u5f00\u6709\u52a9\u4e8e\u907f\u514d\u6b67\u4e49\u3002<\/p>\n
\u6b64\u5916\uff0c\u5c06 filereader \u4e0e\u65b9\u6cd5\u8c03\u7528\u5206\u5f00\u5b9e\u4f8b\u5316\u53ef\u4ee5\u5141\u8bb8\u91cd\u590d\u4f7f\u7528\u5b83\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u4f8b\u5982\uff1a<\/p>\n
const input = document.getelementbyid('input');\n\n\/\/ \u0418\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u043e\u0434\u0438\u043d \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440\nconst filereader = new filereader();\n\ninput.onchange = () => {\n  const file = input.files?.item(0);\n  if (!file) return;\n\n  filereader.readastext(file);\n  filereader.onload = () => {\n    console.log(filereader.result);\n  };\n};<\/pre>\n
\u8fd9\u6837\u6211\u4eec\u51cf\u5c11\u521b\u5efa\u7684 filereader \u5b9e\u4f8b\u7684\u6570\u91cf\u3002<\/p>\n
filereader \u66ff\u4ee3\u65b9\u6848<\/strong><\/p>\n
\u6709\u9002\u5408\u68c0\u7d22\u4e0d\u540c\u7c7b\u578b\u6570\u636e\u7684 filereader \u66ff\u4ee3\u65b9\u6848\u3002\u8ba9\u6211\u4eec\u770b\u4e00\u4e9b\u793a\u4f8b\uff1a<\/p>\n
    \n
  • \u6587\u672c\uff1a<\/strong>\u4f7f\u7528 file \u5bf9\u8c61\u7684 text() \u65b9\u6cd5\uff0c\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n
    const file = input.files?.item(0);\nconst text = await file.text();<\/pre>\n
      \n
    •  \u56fe\u7247\uff1a<\/strong>\u4e3a<img>\u6807\u7b7e\u521b\u5efa\u4e34\u65f6url\u5e76\u663e\u793a\u56fe\u7247\uff0c\u52a0\u8f7d\u540e\u91ca\u653eurl\uff1a<\/li>\n<\/ul>\n
      const file = input.files?.item(0);\nconst blobURL = URL.createObjectURL(file);\nimg.src = blobURL;\nimg.addEventListener('load', () => {\n  URL.revokeObjectURL(blobURL);\n});<\/pre>\n
      \u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aFileReader\u5b9e\u4f8b\u5316\uff1a\u4e3a\u4f55\u8981\u5148\u521b\u5efa\u5bf9\u8c61\u518d\u8fdb\u884c\u6587\u4ef6\u8bfb\u53d6\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u7c73\u4e91\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6587\u7ae0\u77e5\u8bc6\uff01<\/p>\n
      \n
      <\/dt>\n
      \n   \u8054\u901a10\u5146\u5149\u7ea4\u53ef\u4ee5\u5e26\u51e0\u53f0\u7535\u8111\uff1f\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
      FileReader\u5b9e\u4f8b\u5316\uff1a\u4e3a\u4f55\u8981\u5148\u521b\u5efa\u5bf9\u8c61\u518d\u8fdb\u884c\u6587\u4ef6\u8bfb\u53d6\uff1f \u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u6253\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\u300aFileReader\u5b9e\u4f8b\u5316\uff1a\u4e3a\u4f55\u8981\u5148\u521b\u5efa\u5bf9\u8c61\u518d\u8fdb\u884c\u6587\u4ef6\u8bfb\u53d6\uff1f\u300b\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\u5427\uff01\u6587\u4e2d\u5185\u5bb9\u5305\u542b\u7b49\u7b49\u77e5\u8bc6\u70b9…\u5e0c\u671b\u4f60\u80fd\u5728\u9605\u8bfb\u672c\u6587\u540e\uff0c\u80fd\u771f\u771f\u5b9e\u5b9e\u5b66\u5230\u77e5\u8bc6\u6216\u8005\u5e2e\u4f60\u89e3\u51b3\u5fc3\u4e2d\u7684\u7591\u60d1\uff0c\u4e5f\u6b22\u8fce\u5927\u4f6c\u6216\u8005\u65b0\u4eba\u670b\u53cb\u4eec\u591a\u7559\u8a00\u8bc4\u8bba\uff0c\u591a\u7ed9\u5efa\u8bae\uff01\u8c22\u8c22\uff01 \u8bfb\u53d6\u6587\u4ef6\u7684 io \u64cd\u4f5c\u4e3a\u4f55\u8981\u5148\u5b9e\u4f8b\u5316 filereader\uff1f \u5f53\u4f7f\u7528 html \u5143\u7d20 <input type=”file”> filereader \u5b9e\u4f8b\uff0c\u7136\u540e\u901a\u8fc7\u5176\u65b9\u6cd5\u6765\u5904\u7406\u6587\u4ef6\u3002\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0c\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u76f4\u63a5\u5c06\u6587\u4ef6\u4f20\u9012\u7ed9 filereader \u6784\u9020\u51fd\u6570\uff0c\u4f46\u4e3a\u4ec0\u4e48\u8981\u5148\u521b\u5efa\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u7136\u540e\u518d\u505a\u4e00\u4e9b\u4e8b\u60c5\u5462\uff1f \u521b\u5efa filereader \u5b9e\u4f8b\u7684\u539f\u56e0 filereader \u5b9e\u4f8b\u5316\u5141\u8bb8\u6211\u4eec\u6269\u5c55\u6587\u4ef6\u5904\u7406\u903b\u8f91\u3002 \u4f8b\u5982\uff0c\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff1a const filereader = new filereader(); filereader.readastext(file); filereader.addeventlistener(‘load’, () => { console.log(filereader.result); }); \u5047\u8bbe\u6b64\u540e\u6211\u4eec\u6536\u5230\u6587\u4ef6\u592a\u5927\u5e76\u4e14\u8bfb\u53d6\u7684\u53cd\u9988\u8fc7\u7a0b\u9700\u8981\u5f88\u957f\u65f6\u95f4\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u7ed9\u5b9a filereader \u5b9e\u4f8b\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u6dfb\u52a0\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u6765\u8ddf\u8e2a\u8fdb\u5ea6\u3002 const filereader = new filereader(); filereader.readastext(file); filereader.addeventlistener(‘load’, () => { console.log(filereader.result); }); \/\/ \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043e filereader.addeventlistener(‘progress’, (ev) => { console.log(`\u0417\u0430\u0433\u0440\u0443\u0436\u0435\u043d\u043e […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-53414","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/53414","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=53414"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/53414\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=53414"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=53414"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=53414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}