{"id":5585,"date":"2023-01-06T09:49:19","date_gmt":"2023-01-06T01:49:19","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=5585"},"modified":"2023-01-06T09:49:19","modified_gmt":"2023-01-06T01:49:19","slug":"%e6%8e%a2%e7%b4%a2react-js%e5%ad%97%e4%b8%b2%e7%9a%84%e9%a6%96%e5%ad%97%e7%ac%a6%e4%bd%8d%e7%bd%aeindexof","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/react-js\/%e6%8e%a2%e7%b4%a2react-js%e5%ad%97%e4%b8%b2%e7%9a%84%e9%a6%96%e5%ad%97%e7%ac%a6%e4%bd%8d%e7%bd%aeindexof\/","title":{"rendered":"\u63a2\u7d22React.JS\u5b57\u4e32\u7684\u9996\u5b57\u7b26\u4f4d\u7f6e(indexOf)"},"content":{"rendered":"

<\/p>\n

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React.JS \u662f\u4e00\u500b\u7528\u65bc\u69cb\u5efa\u7528\u6236\u754c\u9762\u7684 JavaScript \u5eab\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u66f4\u8f15\u9b06\u5730\u69cb\u5efa\u9ad8\u6027\u80fd\u7684\u7db2\u9801\u61c9\u7528\u7a0b\u5e8f\u3002\u5728 React.JS \u4e2d\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u4f7f\u7528 indexOf \u65b9\u6cd5\u4f86\u53d6\u5f97\u5b57\u4e32\u7684\u9996\u5b57\u7b26\u4f4d\u7f6e\u3002<\/p>\n

indexOf \u65b9\u6cd5\u53ef\u4ee5\u7528\u4f86\u641c\u7d22\u4e00\u500b\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5b58\u5728\u67d0\u500b\u5b57\u7b26\uff0c\u5982\u679c\u5b58\u5728\uff0c\u5247\u8fd4\u56de\u8a72\u5b57\u7b26\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5247\u8fd4\u56de -1\u3002<\/p>\n

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\nlet str = \"React.JS\";\nlet index = str.indexOf(\"R\");\nconsole.log(index); \/\/ 0\n<\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u5b57\u7b26\u4e32 str\uff0c\u7136\u5f8c\u4f7f\u7528 indexOf \u65b9\u6cd5\u641c\u7d22\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5b58\u5728 “R” \u5b57\u7b26\uff0c\u5982\u679c\u5b58\u5728\uff0c\u5247\u8fd4\u56de\u8a72\u5b57\u7b26\u7684\u4f4d\u7f6e\uff0c\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u8fd4\u56de\u7684\u662f 0\uff0c\u8868\u793a “R” \u5b57\u7b26\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e\u662f 0\u3002<\/p>\n
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\nlet str = \"React.JS\";\nlet index = str.indexOf(\"act\");\nconsole.log(index); \/\/ 2\n<\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 indexOf \u65b9\u6cd5\u641c\u7d22\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5b58\u5728 “act” \u5b57\u7b26\u4e32\uff0c\u5982\u679c\u5b58\u5728\uff0c\u5247\u8fd4\u56de\u8a72\u5b57\u7b26\u4e32\u7684\u4f4d\u7f6e\uff0c\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u8fd4\u56de\u7684\u662f 2\uff0c\u8868\u793a “act” \u5b57\u7b26\u4e32\u5728\u5b57\u7b26\u4e32\u4e2d\u7684\u4f4d\u7f6e\u662f 2\u3002<\/p>\n
\u7e3d\u7d50\u4f86\u8aaa\uff0cindexOf \u65b9\u6cd5\u53ef\u4ee5\u7528\u4f86\u641c\u7d22\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5b58\u5728\u67d0\u500b\u5b57\u7b26\u6216\u5b57\u7b26\u4e32\uff0c\u5982\u679c\u5b58\u5728\uff0c\u5247\u8fd4\u56de\u8a72\u5b57\u7b26\u6216\u5b57\u7b26\u4e32\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5247\u8fd4\u56de -1\u3002<\/p>\n
<\/p>\n
\u4f7f\u7528 indexOf \u65b9\u6cd5\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n
\u4f7f\u7528 indexOf \u65b9\u6cd5\u641c\u7d22\u5b57\u7b26\u4e32\u6642\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n
    \n
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    \nlet str = \"React.JS\";\nlet index = str.indexOf(\"r\");\nconsole.log(index); \/\/ -1\n        <\/pre>\n
            \u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 indexOf \u65b9\u6cd5\u641c\u7d22\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5b58\u5728 “r” \u5b57\u7b26\uff0c\u7531\u65bc “r” \u548c “R” \u662f\u4e0d\u540c\u7684\u5b57\u7b26\uff0c\u6240\u4ee5 indexOf \u65b9\u6cd5\u8fd4\u56de -1\uff0c\u8868\u793a\u5b57\u7b26\u4e32\u4e2d\u4e0d\u5b58\u5728 “r” \u5b57\u7b26\u3002\n    <\/li>\n
  • indexOf \u65b9\u6cd5\u53ef\u4ee5\u63a5\u53d7\u7b2c\u4e8c\u500b\u53c3\u6578\uff0c\u8868\u793a\u5f9e\u54ea\u500b\u4f4d\u7f6e\u958b\u59cb\u641c\u7d22\uff0c\u4f8b\u5982\uff1a\n
    \nlet str = \"React.JS\";\nlet index = str.indexOf(\"a\", 2);\nconsole.log(index); \/\/ 3\n        <\/pre>\n
            \u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 indexOf \u65b9\u6cd5\u641c\u7d22\u5b57\u7b26\u4e32\u4e2d\u662f\u5426\u5b58\u5728 “a” \u5b57\u7b26\uff0c\u4e26\u4e14\u5f9e\u4f4d\u7f6e 2 \u958b\u59cb\u641c\u7d22\uff0cindexOf \u65b9\u6cd5\u8fd4\u56de 3\uff0c\u8868\u793a\u5b57\u7b26\u4e32\u4e2d “a” \u5b57\u7b26\u7684\u4f4d\u7f6e\u662f 3\u3002\n    <\/li>\n<\/ul>\n
    \u7e3d\u7d50<\/h2>\n
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    \u6587\u7ae0\u6458\u8981\uff1a\u672c\u6587\u5c07\u4ecb\u7d39React.JS\u4e2d\u7684indexOf()\u51fd\u6578\uff0c\u5b83\u53ef\u4ee5\u7528\u4f86\u641c\u5c0b\u5b57\u4e32\u4e2d\u6307\u5b9a\u5b57\u5143\u7684\u4f4d\u7f6e\uff0c\u4e26\u63d0\u4f9b\u7c21\u55ae\u6613\u7528\u7684\u65b9\u6cd5\u4f86\u64cd\u4f5c\u5b57\u4e32\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[184,183],"tags":[182,181],"class_list":["post-5585","post","type-post","status-publish","format-standard","hentry","category-react","category-react-js","tag-react","tag-react-js"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-1s5","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5585","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=5585"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5585\/revisions"}],"predecessor-version":[{"id":5586,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/5585\/revisions\/5586"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=5585"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=5585"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=5585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}