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Ajax\uff08\u5f02\u6b65JavaScript\u548cXML\uff09\u662f\u4e00\u79cd\u5728\u65e0\u9700\u91cd\u65b0\u52a0\u8f7d\u6574\u9875\u7684\u60c5\u51b5\u4e0b\uff0c\u80fd\u591f\u66f4\u65b0\u90e8\u5206\u7f51\u9875\u7684\u6280\u672f\u3002\u5b83\u4f9d\u8d56\u4e8eXMLHttpRequest\u5bf9\u8c61\u6765\u4e0e\u670d\u52a1\u5668\u8fdb\u884c\u4ea4\u4e92\u3002\u8fd9\u5bf9\u5b9e\u73b0Web\u5e94\u7528\u4e2d\u7684Agent\u5c24\u4e3a\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u5141\u8bb8\u5e94\u7528\u5f02\u6b65\u5730\u4ece\u670d\u52a1\u5668\u8bf7\u6c42\u3001\u53d1\u9001\u6570\u636e\uff0c\u8fdb\u800c\u52a8\u6001\u5730\u66f4\u65b0\u7528\u6237\u754c\u9762\u3002<\/p>\n<\/p>\n
\u9996\u5148\uff0c\u8981\u521b\u5efa\u4e00\u4e2aXMLHttpRequest\u5bf9\u8c61\u3002\u7136\u540e\uff0c\u4f60\u53ef\u4ee5\u914d\u7f6e\u8fd9\u4e2a\u5bf9\u8c61\uff0c\u6307\u5b9a\u8bf7\u6c42\u7684\u7c7b\u578b\uff08GET\u6216POST\uff09\u3001URL\uff0c\u4ee5\u53ca\u662f\u5426\u5f02\u6b65\u3002\u7d27\u63a5\u7740\uff0c\u901a\u8fc7\u6ce8\u518c\u56de\u8c03\u51fd\u6570\u6765\u5904\u7406\u670d\u52a1\u5668\u7684\u54cd\u5e94\u3002\u6700\u540e\uff0c\u901a\u8fc7send()\u65b9\u6cd5\u53d1\u9001\u8bf7\u6c42\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0creadystatechange\u4e8b\u4ef6\u662f\u975e\u5e38\u5173\u952e\u7684\uff0c\u56e0\u4e3a\u5b83\u5141\u8bb8\u6211\u4eec\u5728\u8bf7\u6c42\u7684\u4e0d\u540c\u9636\u6bb5\u8fdb\u884c\u4e0d\u540c\u7684\u64cd\u4f5c\uff0c\u6bd4\u5982\u5f53\u8bf7\u6c42\u6210\u529f\u5b8c\u6210\u4e14\u54cd\u5e94\u5df2\u5c31\u7eea\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u83b7\u53d6\u5e76\u5904\u7406\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u5229\u7528PROMISE\u5b9e\u73b0\u5f02\u6b65\u7f16\u7a0b<\/h2>\n<\/p>\n
Promise\u662fES6\u5f15\u5165\u7684\u4e00\u79cd\u7528\u4e8e\u5f02\u6b65\u7f16\u7a0b\u7684\u65b0\u6982\u5ff5\u3002\u5b83\u8868\u793a\u4e00\u4e2a\u5f02\u6b65\u64cd\u4f5c\u7684\u6700\u7ec8\u5b8c\u6210\uff08\u6216\u5931\u8d25\uff09\u53ca\u5176\u7ed3\u679c\u503c\u7684\u5bf9\u8c61\u3002\u4f7f\u7528Promise\u53ef\u4ee5\u8ba9\u5f02\u6b65\u64cd\u4f5c\u66f4\u52a0\u6e05\u6670\uff0c\u4ee3\u7801\u66f4\u6613\u4e8e\u7406\u89e3\u548c\u7ef4\u62a4\u3002<\/p>\n<\/p>\n
\u4e00\u4e2aPromise\u5bf9\u8c61\u4ee3\u8868\u4e00\u4e2a\u5c1a\u672a\u5b8c\u6210\u4f46\u9884\u671f\u5c06\u6765\u4f1a\u5b8c\u6210\u7684\u64cd\u4f5c\u3002\u6bcf\u4e2aPromise\u90fd\u6709\u4e09\u79cd\u72b6\u6001\uff1apending\uff08\u7b49\u5f85\u4e2d\uff09\u3001fulfilled\uff08\u5df2\u6210\u529f\uff09\u548crejected\uff08\u5df2\u5931\u8d25\uff09\u3002\u4f7f\u7528Promise\u7684\u4f18\u70b9\u5728\u4e8e\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e2a\u6807\u51c6\u7684API\u6765\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\uff0c\u8ba9\u5d4c\u5957\u7684\u56de\u8c03\u51fd\u6570\u548c\u590d\u6742\u7684\u9519\u8bef\u5904\u7406\u7a0b\u5e8f\u53d8\u6210\u8fc7\u53bb\u5f0f\u3002\u901a\u8fc7then\u65b9\u6cd5\u53ef\u4ee5\u4e3aPromise\u6dfb\u52a0\u5904\u7406\u6210\u529f\u548c\u5931\u8d25\u7684\u56de\u8c03\u51fd\u6570\uff0c\u800ccatch\u65b9\u6cd5\u5219\u7528\u4e8e\u6355\u83b7\u5904\u7406\u8fc7\u7a0b\u4e2d\u629b\u51fa\u7684\u5f02\u5e38\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u901a\u8fc7ASYNC\/AWAIT\u7b80\u5316\u5f02\u6b65\u5904\u7406\u6d41\u7a0b<\/h2>\n<\/p>\n
ES7\u5f15\u5165\u7684async\/await\uff0c\u662f\u5199\u5f02\u6b65\u4ee3\u7801\u7684\u65b0\u65b9\u5f0f\u3002\u8fd9\u4e24\u4e2a\u5173\u952e\u5b57\u53ef\u4ee5\u8ba9\u6211\u4eec\u7528\u540c\u6b65\u7684\u65b9\u5f0f\u5199\u51fa\u770b\u8d77\u6765\u66f4\u7b80\u6d01\u7684\u5f02\u6b65\u4ee3\u7801\u3002async\u8868\u793a\u51fd\u6570\u662f\u5f02\u6b65\u7684\uff0c\u5b9a\u4e49\u7684\u51fd\u6570\u4f1a\u8fd4\u56de\u4e00\u4e2aPromise\u3002await\u7528\u4e8e\u7b49\u5f85Promise\u5b8c\u6210\uff0c\u53ea\u80fd\u5728async\u51fd\u6570\u5185\u4f7f\u7528\u3002<\/p>\n<\/p>\n
\u4f7f\u7528async\/await\u7684\u6700\u5927\u597d\u5904\u662f\u4ee3\u7801\u6e05\u6670\u6613\u61c2\u3002\u5b83\u8ba9\u5f02\u6b65\u4ee3\u7801\u770b\u8d77\u6765\u50cf\u540c\u6b65\u4ee3\u7801\uff0c\u6781\u5927\u5730\u7b80\u5316\u4e86\u5f02\u6b65\u64cd\u4f5c\u7684\u590d\u6742\u5ea6\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6211\u4eec\u53ea\u9700\u5728\u51fd\u6570\u58f0\u660e\u524d\u6dfb\u52a0async\u5173\u952e\u5b57\uff0c\u5728\u60f3\u8981\u7b49\u5f85Promise\u7ed3\u679c\u7684\u8868\u8fbe\u5f0f\u524d\u4f7f\u7528await\u5173\u952e\u5b57\uff0c\u4fbf\u53ef\u4ee5\u4ee5\u540c\u6b65\u7f16\u7a0b\u7684\u65b9\u5f0f\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
\u56db\u3001\u91c7\u7528FETCH API\u8fdb\u884c\u7f51\u7edc\u8bf7\u6c42<\/h2>\n<\/p>\n
Fetch API\u662f\u4e00\u79cd\u73b0\u4ee3\u3001\u66f4\u6613\u4e8e\u4f7f\u7528\u7684\u7f51\u7edcAPI\uff0c\u4e3a\u66ff\u4ee3\u4f20\u7edf\u7684XMLHttpRequest\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5f3a\u6709\u529b\u7684\u9009\u62e9\u3002\u4f7f\u7528Fetch\u53ef\u4ee5\u66f4\u7b80\u5355\u5730\u8fdb\u884c\u7f51\u7edc\u8bf7\u6c42\u548c\u64cd\u4f5c\u8fd4\u56de\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n
Fetch API\u4f7f\u7528Promises\uff0c\u4f7f\u5f97\u5904\u7406\u5f02\u6b65\u8bf7\u6c42\u548c\u54cd\u5e94\u66f4\u52a0\u65b9\u4fbf\u3002\u901a\u8fc7fetch()\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u53d1\u8d77GET\u6216POST\u8bf7\u6c42\uff0c\u5e76\u5229\u7528.then()\u5904\u7406\u6210\u529f\u7684\u54cd\u5e94\u6216.catch()\u6355\u83b7\u9519\u8bef\u3002Fetch\u4e0d\u4ec5\u7b80\u5316\u4e86\u8bf7\u6c42\u7684\u8bed\u6cd5\uff0c\u540c\u65f6\u4e5f\u63d0\u4f9b\u4e86\u66f4\u52a0\u4e30\u5bcc\u7684API\u6765\u5904\u7406\u8bf7\u6c42\u548c\u54cd\u5e94\uff0c\u6bd4\u5982\u53ef\u4ee5\u901a\u8fc7Response\u5bf9\u8c61\u6765\u68c0\u67e5\u54cd\u5e94\u7684\u72b6\u6001\u7801\u3001\u89e3\u6790JSON\u6570\u636e\u7b49\u3002<\/p>\n<\/p>\n
\u5728\u5b9e\u73b0\u524d\u7aefAgent\u7684\u65f6\u5019\uff0c\u9009\u62e9\u9002\u5408\u7684\u6280\u672f\u548c\u65b9\u6cd5\u5bf9\u4e8e\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\u3001\u786e\u4fdd\u5e94\u7528\u7684\u6027\u80fd\u975e\u5e38\u5173\u952e\u3002\u4ee5\u4e0a\u63d0\u5230\u7684\u6838\u5fc3\u65b9\u6cd5\u662f\u5b9e\u73b0\u524d\u7aefAgent\u7684\u5173\u952e\u6280\u672f\uff0c\u5b83\u4eec\u5404\u81ea\u6709\u7740\u7279\u5b9a\u7684\u5e94\u7528\u573a\u666f\u548c\u4f18\u52bf\u3002\u5f00\u53d1\u8005\u5e94\u6839\u636e\u81ea\u8eab\u9879\u76ee\u7684\u9700\u6c42\uff0c\u7075\u6d3b\u9009\u62e9\u5e76\u9002\u5f53\u7ed3\u5408\u4f7f\u7528\u8fd9\u4e9b\u6280\u672f\uff0c\u4ece\u800c\u66f4\u9ad8\u6548\u5730\u5b9e\u73b0\u524d\u7aefAgent\u7684\u529f\u80fd\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n1. \u524d\u7aef Javascript \u5982\u4f55\u5b9e\u73b0 Agent\uff1f<\/strong><\/p>\n\u524d\u7aef Javascript \u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0 User-Agent \u5b57\u7b26\u4e32\u6765\u6a21\u62df Agent\u3002\u901a\u8fc7\u4fee\u6539 User-Agent \u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u6539\u53d8\u6d4f\u89c8\u5668\u53d1\u9001\u7684\u8bf7\u6c42\u5934\uff0c\u4ee5\u4f7f\u670d\u52a1\u7aef\u8bc6\u522b\u4e3a\u4e0d\u540c\u7684\u5ba2\u6237\u7aef\u7c7b\u578b\u3002\u53ef\u4ee5\u4f7f\u7528 navigator.userAgent<\/code> \u6765\u83b7\u53d6\u5f53\u524d\u6d4f\u89c8\u5668\u7684 User-Agent \u5b57\u7b26\u4e32\uff0c\u5e76\u901a\u8fc7\u4fee\u6539 navigator.userAgent<\/code> \u7684\u503c\u6765\u5b9e\u73b0\u5bf9\u5e94\u7684 Agent\u3002<\/p>\n2. \u5982\u4f55\u5728\u524d\u7aef Javascript \u4e2d\u8bc6\u522b\u7528\u6237\u7684 Agent\uff1f<\/strong><\/p>\n\u53ef\u4ee5\u4f7f\u7528 navigator.userAgent<\/code> \u6765\u83b7\u53d6\u7528\u6237\u7684 User-Agent \u5b57\u7b26\u4e32\uff0c\u8fdb\u800c\u8bc6\u522b\u7528\u6237\u7684 Agent\u3002\u7528\u6237\u7684 User-Agent \u5b57\u7b26\u4e32\u5305\u542b\u4e86\u5173\u4e8e\u7528\u6237\u6d4f\u89c8\u5668\u7c7b\u578b\u3001\u64cd\u4f5c\u7cfb\u7edf\u3001\u8bbe\u5907\u578b\u53f7\u7b49\u4fe1\u606f\u3002\u6839\u636e\u4e0d\u540c\u7684 User-Agent \u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u5224\u65ad\u7528\u6237\u4f7f\u7528\u7684\u6d4f\u89c8\u5668\u3001\u64cd\u4f5c\u7cfb\u7edf\u7b49\u73af\u5883\u4fe1\u606f\uff0c\u4ece\u800c\u4f18\u5316\u524d\u7aef\u9875\u9762\u663e\u793a\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u6839\u636e\u7528\u6237\u7684\u8bbe\u5907\u7c7b\u578b\uff0c\u9488\u5bf9\u79fb\u52a8\u7aef\u6216\u684c\u9762\u7aef\u8fdb\u884c\u4e0d\u540c\u7684\u754c\u9762\u9002\u914d\u3002<\/p>\n3. \u5728\u524d\u7aef Javascript \u4e2d\u5982\u4f55\u9488\u5bf9\u4e0d\u540c Agent \u8fdb\u884c\u903b\u8f91\u5224\u65ad\uff1f<\/strong><\/p>\n\u901a\u8fc7\u68c0\u6d4b\u7528\u6237\u7684 User-Agent \u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684 Agent \u8fdb\u884c\u903b\u8f91\u5224\u65ad\u548c\u5206\u652f\u5904\u7406\u3002\u53ef\u4ee5\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u6216\u5b57\u7b26\u4e32\u5339\u914d\u7684\u65b9\u5f0f\u6765\u5224\u65ad User-Agent \u662f\u5426\u7b26\u5408\u7279\u5b9a\u7684\u6761\u4ef6\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5224\u65ad\u7528\u6237\u662f\u5426\u4f7f\u7528\u79fb\u52a8\u8bbe\u5907\u3001\u662f\u5426\u4f7f\u7528\u67d0\u79cd\u7279\u5b9a\u7684\u6d4f\u89c8\u5668\u3001\u662f\u5426\u4f7f\u7528\u67d0\u4e2a\u7279\u5b9a\u7684\u64cd\u4f5c\u7cfb\u7edf\u7b49\u3002\u6839\u636e\u5224\u65ad\u7ed3\u679c\uff0c\u53ef\u4ee5\u6267\u884c\u4e0d\u540c\u7684\u903b\u8f91\u6765\u4e3a\u7528\u6237\u63d0\u4f9b\u4e2a\u6027\u5316\u7684\u4f53\u9a8c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728\u5b9e\u73b0\u524d\u7aefJavascript\u4e2dAgent\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6700\u6838\u5fc3\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528Ajax\u6765\u8fdb\u884c\u5f02\u6b65\u8bf7\u6c42\u3001\u5229\u7528Promi […]","protected":false},"author":3,"featured_media":153758,"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\/153748"}],"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=153748"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/153748\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/153758"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=153748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=153748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=153748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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<\/p>\n