{"id":161583,"date":"2024-05-08T13:54:36","date_gmt":"2024-05-08T05:54:36","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/161583.html"},"modified":"2024-05-08T13:54:44","modified_gmt":"2024-05-08T05:54:44","slug":"%e5%85%b3%e4%ba%8ejavascript%e4%b8%ad%e4%ba%8b%e4%bb%b6%e5%be%aa%e7%8e%af%e4%b8%8exhr%e5%af%b9%e8%b1%a1%e7%9a%84%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/161583.html","title":{"rendered":"\u5173\u4e8eJavaScript\u4e2d\u4e8b\u4ef6\u5faa\u73af\u4e0eXHR\u5bf9\u8c61\u7684\u95ee\u9898"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26224236\/82e52d84-baa6-4ade-8ba8-2c1675e9b420.webp\" alt=\"\u5173\u4e8eJavaScript\u4e2d\u4e8b\u4ef6\u5faa\u73af\u4e0eXHR\u5bf9\u8c61\u7684\u95ee\u9898\" 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XML\uff09\u8bf7\u6c42\u7684\u4e3b\u8981\u65b9\u5f0f<\/strong>\u3002\u4e8b\u4ef6\u5faa\u73af\u4f7f\u5f97JavaScript\u80fd\u591f\u6267\u884c\u975e\u963b\u585e\u6027\u7684\u64cd\u4f5c\uff0c\u800cXHR\u5bf9\u8c61\u5141\u8bb8Web\u5e94\u7528\u80fd\u591f\u5f02\u6b65\u8bf7\u6c42\u6570\u636e\u3002\u5728\u8fd9\u4e24\u8005\u7684\u914d\u5408\u4e0b\uff0cJavaScript\u80fd\u591f\u5728\u4e0d\u5f71\u54cd\u9875\u9762\u52a0\u8f7d\u7684\u524d\u63d0\u4e0b\uff0c\u4ece\u540e\u7aef\u83b7\u53d6\u6570\u636e\uff0c\u4ece\u800c\u5b9e\u73b0\u66f4\u6d41\u7545\u7684\u7528\u6237\u4ea4\u4e92\u4f53\u9a8c\u3002<\/p>\n<\/p>\n<p><p><strong>\u4e8b\u4ef6\u5faa\u73af<\/strong>\u8d1f\u8d23\u76d1\u63a7\u6267\u884c\u6808\u548c\u6d88\u606f\u961f\u5217\u3002\u5982\u679c\u6267\u884c\u6808\u4e3a\u7a7a\uff0c\u5b83\u4f1a\u67e5\u770b\u6d88\u606f\u961f\u5217\u4e2d\u662f\u5426\u6709\u5f85\u5904\u7406\u7684\u6d88\u606f\u3002\u5982\u679c\u6709\uff0c\u4e8b\u4ef6\u5faa\u73af\u4f1a\u5c06\u6d88\u606f\u51fa\u961f\uff0c\u5e76\u5c06\u76f8\u5173\u56de\u8c03\u653e\u5165\u6267\u884c\u6808\u4e2d\u6267\u884c\u3002\u8fd9\u4e00\u8fc7\u7a0b\u662f\u5faa\u73af\u4e0d\u65ad\u7684\uff0c\u56e0\u6b64\u5f97\u540d\u201c\u4e8b\u4ef6\u5faa\u73af\u201d\u3002<\/p>\n<\/p>\n<p><h2>\u4e00\u3001\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af<\/h2>\n<\/p>\n<p><p>\u4e8b\u4ef6\u5faa\u73af\u7684\u5de5\u4f5c\u65b9\u5f0f\u4fdd\u8bc1\u4e86JavaScript\u7684\u975e\u963b\u585e\u6027\u7279\u6027\u3002\u5b83\u5141\u8bb8JavaScript\u4ee3\u7801\u5728\u6267\u884c\u957f\u65f6\u95f4\u64cd\u4f5c\uff0c\u5982\u7f51\u7edc\u8bf7\u6c42\u65f6\uff0c\u8fd8\u80fd\u7ee7\u7eed\u5904\u7406\u5176\u4ed6\u4efb\u52a1\u3002\u8fd9\u662f\u901a\u8fc7\u628a\u8fd9\u4e9b\u64cd\u4f5c\u4ea4\u7ed9\u6d4f\u89c8\u5668\u6216\u73af\u5883\u6765\u5904\u7406\uff0c\u7136\u540e\u5728\u9002\u5f53\u7684\u65f6\u5019\u901a\u8fc7\u4e8b\u4ef6\u6216\u8005\u56de\u8c03\u51fd\u6570\u6765\u901a\u77e5JavaScript\u7ee7\u7eed\u6267\u884c\u4efb\u52a1\u5b9e\u73b0\u7684\u3002<\/p>\n<\/p>\n<p><h3>\u6d88\u606f\u961f\u5217\u4e0e\u6267\u884c\u6808<\/h3>\n<\/p>\n<p><p>\u6d88\u606f\u961f\u5217\u662f\u4e00\u4e2a\u5148\u8fdb\u5148\u51fa\uff08FIFO\uff09\u7684\u6570\u636e\u7ed3\u6784\uff0c\u7528\u4e8e\u5b58\u50a8\u5f85\u5904\u7406\u7684\u6d88\u606f\u3002\u6267\u884c\u6808\u5219\u662f\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u4ee3\u7801\u7684\u4e00\u4e2a\u5806\u6808\u3002JavaScript\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u610f\u5473\u7740\u5b83\u4e00\u6b21\u53ea\u80fd\u6267\u884c\u4e00\u4e2a\u4efb\u52a1\u3002\u4e8b\u4ef6\u5faa\u73af\u901a\u8fc7\u8f6e\u8be2\u6d88\u606f\u961f\u5217\u6765\u5b9e\u73b0\u591a\u4efb\u52a1\u7684\u5e76\u53d1\u5904\u7406\uff0c\u4f7f\u5f97\u5f02\u6b65\u4efb\u52a1\u53ef\u4ee5\u5728\u672a\u6765\u67d0\u4e00\u65f6\u523b\u6267\u884c\u3002<\/p>\n<\/p>\n<p><h3>\u5b8f\u4efb\u52a1\u4e0e\u5fae\u4efb\u52a1<\/h3>\n<\/p>\n<p><p>\u5728\u4e8b\u4ef6\u5faa\u73af\u4e2d\uff0c\u4efb\u52a1\u53ef\u4ee5\u5206\u4e3a\u5b8f\u4efb\u52a1\u548c\u5fae\u4efb\u52a1\uff0c\u5b83\u4eec\u6709\u4e0d\u540c\u7684\u6267\u884c\u4f18\u5148\u7ea7\u3002\u5b8f\u4efb\u52a1\u5305\u62ec\uff1a\u6574\u4f53\u4ee3\u7801script\u3001setTimeout\u3001setInterval\u7b49\u3002\u5fae\u4efb\u52a1\u5305\u62ec\uff1aPromise\u3001process.nextTick\u7b49\u3002\u5fae\u4efb\u52a1\u7684\u6267\u884c\u65f6\u673a\u5728\u6bcf\u4e2a\u5b8f\u4efb\u52a1\u6267\u884c\u5b8c\u540e\u3001\u4e0b\u4e00\u4e2a\u5b8f\u4efb\u52a1\u6267\u884c\u524d\uff0c\u8fd9\u4e2a\u7279\u6027\u4f7f\u5f97\u5fae\u4efb\u52a1\u4f18\u5148\u4e8e\u5b8f\u4efb\u52a1\u6267\u884c\u3002<\/p>\n<\/p>\n<p><h2>\u4e8c\u3001\u7406\u89e3XHR\u5bf9\u8c61<\/h2>\n<\/p>\n<p><p>XMLHttpRequest\u5bf9\u8c61\u63d0\u4f9b\u4e86\u5728\u6d4f\u89c8\u5668\u4e2d\u53d1\u9001HTTP\u8bf7\u6c42\u548c\u63a5\u6536HTTP\u54cd\u5e94\u7684\u80fd\u529b\u3002\u4f7f\u7528XHR\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u6784\u5efa\u590d\u6742\u7684\u5ba2\u6237\u7aef\u5e94\u7528\u7a0b\u5e8f\uff0c\u80fd\u591f\u6839\u636e\u7528\u6237\u64cd\u4f5c\u6216\u5176\u4ed6\u4e8b\u4ef6\u52a8\u6001\u83b7\u53d6\u65b0\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h3>\u521b\u5efa\u4e0e\u53d1\u9001\u8bf7\u6c42<\/h3>\n<\/p>\n<p><p>\u521b\u5efa\u4e00\u4e2aXHR\u5bf9\u8c61\u662f\u901a\u8fc7<code>new XMLHttpRequest()<\/code>\u5b9e\u73b0\u7684\u3002\u53d1\u9001\u8bf7\u6c42\u5219\u901a\u8fc7<code>xhr.open()<\/code>\u548c<code>xhr.send()<\/code>\u65b9\u6cd5\u6765\u5b8c\u6210\u3002\u8fd9\u4e9bAPI\u4f7f\u5f97\u5f00\u53d1\u8005\u80fd\u591f\u6307\u5b9a\u8bf7\u6c42\u7684\u7c7b\u578b\u3001URL\u3001\u662f\u5426\u5f02\u6b65\u7b49\u53c2\u6570\uff0c\u5e76\u80fd\u591f\u53d1\u9001\u8bf7\u6c42\u4f53\u3002<\/p>\n<\/p>\n<p><h3>\u5904\u7406\u54cd\u5e94<\/h3>\n<\/p>\n<p><p>\u5904\u7406XHR\u8bf7\u6c42\u7684\u54cd\u5e94\u6d89\u53ca\u5230\u76d1\u542c<code>readystatechange<\/code>\u4e8b\u4ef6\uff0c\u5e76\u68c0\u67e5<code>xhr.readyState<\/code>\u5c5e\u6027\u548c<code>xhr.status<\/code>\u72b6\u6001\u7801\u3002\u5f53<code>readystatechange<\/code>\u4e8b\u4ef6\u89e6\u53d1\uff0c\u5e76\u4e14<code>readyState<\/code>\u5c5e\u6027\u4e3a4\uff08\u8868\u793a\u8bf7\u6c42\u5df2\u5b8c\u6210\u5e76\u4e14\u54cd\u5e94\u5df2\u5c31\u7eea\uff09\uff0c\u4ee5\u53caHTTP\u72b6\u6001\u7801\u4e3a200\uff08\u8868\u793a\u8bf7\u6c42\u6210\u529f\uff09\uff0c\u6b64\u65f6\u53ef\u4ee5\u901a\u8fc7<code>xhr.responseText<\/code>\u6216<code>xhr.responseXML<\/code>\u83b7\u53d6\u54cd\u5e94\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h2>\u4e09\u3001\u4e8b\u4ef6\u5faa\u73af\u4e0eXHR\u5bf9\u8c61\u7684\u4ea4\u4e92<\/h2>\n<\/p>\n<p><p>\u4e8b\u4ef6\u5faa\u73af\u4e0eXHR\u5bf9\u8c61\u7684\u4ea4\u4e92\u6a21\u5f0f\u662fJavaScript\u5f02\u6b65\u7f16\u7a0b\u7684\u5173\u952e\u6240\u5728\u3002\u5f53\u89e6\u53d1XHR\u8bf7\u6c42\u65f6\uff0c\u8bf7\u6c42\u64cd\u4f5c\u7531\u6d4f\u89c8\u5668\u63a5\u7ba1\uff0c\u4e0e\u6267\u884cJavaScript\u4ee3\u7801\u7684\u4e3b\u7ebf\u7a0b\u5206\u79bb\u3002\u8bf7\u6c42\u64cd\u4f5c\u5b8c\u6210\u540e\uff0c\u6d4f\u89c8\u5668\u5c06\u4e00\u4e2a\u4efb\u52a1\u52a0\u5165\u5230JavaScript\u7684\u6d88\u606f\u961f\u5217\u4e2d\u3002\u4e8b\u4ef6\u5faa\u73af\u76d1\u89c6\u6d88\u606f\u961f\u5217\uff0c\u5f53\u6267\u884c\u6808\u7a7a\u95f2\u65f6\uff0c\u4e8b\u4ef6\u5faa\u73af\u5c06\u6b64\u4efb\u52a1\u53d6\u51fa\uff0c\u6267\u884c\u76f8\u5173\u7684\u56de\u8c03\u51fd\u6570\u3002<\/p>\n<\/p>\n<p><h3>\u5f02\u6b65\u8bf7\u6c42\u7684\u5904\u7406<\/h3>\n<\/p>\n<p><p>\u5728\u5904\u7406XHR\u5f02\u6b65\u8bf7\u6c42\u65f6\uff0c\u901a\u5e38\u4f1a\u4f7f\u7528\u56de\u8c03\u51fd\u6570\u3001Promise\u6216\u8005async\/aw<a href=\"https:\/\/docs.pingcode.com\/blog\/59162.html\" target=\"_blank\">AI<\/a>t\u7b49\u65b9\u5f0f\u3002\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u6709\u6548\u7ba1\u7406\u5f02\u6b65\u903b\u8f91\uff0c\u907f\u514d\u56de\u8c03\u5730\u72f1\uff0c\u5e76\u4f7f\u4ee3\u7801\u66f4\u52a0\u6e05\u6670\u548c\u6613\u7ef4\u62a4\u3002<\/p>\n<\/p>\n<p><h3>\u4e8b\u4ef6\u5faa\u73af\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u7684\u793a\u4f8b<\/h3>\n<\/p>\n<p><p>\u4e00\u4e2a\u5178\u578b\u7684\u573a\u666f\u662f\u5728\u7f51\u9875\u4e0a\u4f7f\u7528XHR\u8bf7\u6c42\u4ece\u670d\u52a1\u5668\u52a0\u8f7d\u6570\u636e\uff0c\u5e76\u4f7f\u7528Promise\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\u3002\u5f53\u6570\u636e\u52a0\u8f7d\u5b8c\u6bd5\uff0cPromise\u72b6\u6001\u53d8\u4e3aresolved\u3002\u4e8b\u4ef6\u5faa\u73af\u5c06\u5904\u7406Promise\u56de\u8c03\u7684\u4efb\u52a1\u6392\u961f\uff0c\u5728\u5f53\u524d\u5b8f\u4efb\u52a1\u5b8c\u6210\u540e\u3001\u4e0b\u4e00\u4e2a\u5b8f\u4efb\u52a1\u5f00\u59cb\u4e4b\u524d\uff0c\u6267\u884c\u8fd9\u4e9b\u5fae\u4efb\u52a1\u56de\u8c03\u3002<\/p>\n<\/p>\n<p><h2>\u56db\u3001\u5c0f\u7ed3\u4e0e\u5c55\u671b<\/h2>\n<\/p>\n<p><p>\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af\u548cXHR\u5bf9\u8c61\u53ca\u5176\u76f8\u4e92\u4f5c\u7528\u5bf9\u4e8e\u638c\u63e1JavaScript\u5f02\u6b65\u7f16\u7a0b\u81f3\u5173\u91cd\u8981\u3002\u968f\u7740Web\u5e94\u7528\u53d8\u5f97\u8d8a\u6765\u8d8a\u590d\u6742\uff0c\u5f00\u53d1\u8005\u9700\u8981\u719f\u6089\u8fd9\u4e9b\u6982\u5ff5\uff0c\u624d\u80fd\u6709\u6548\u5730\u6784\u5efa\u54cd\u5e94\u8fc5\u901f\u3001\u7528\u6237\u4f53\u9a8c\u826f\u597d\u7684\u5e94\u7528\u3002\u672a\u6765\uff0c\u968f\u7740\u65b0\u7684API\u548c\u6846\u67b6\u7684\u4e0d\u65ad\u6d8c\u73b0\uff0c\u5f02\u6b65\u7f16\u7a0b\u7684\u6a21\u5f0f\u548c\u6280\u672f\u4e5f\u5c06\u4e0d\u65ad\u6f14\u5316\uff0c\u4f46\u4e8b\u4ef6\u5faa\u73af\u4f5c\u4e3a\u5f02\u6b65\u7f16\u7a0b\u7684\u57fa\u77f3\u5c06\u7ee7\u7eed\u53d1\u6325\u5176\u6838\u5fc3\u4f5c\u7528\u3002<\/p>\n<\/p>\n<p><p><strong>\u7406\u89e3JavaScript\u4e2d\u7684\u4e8b\u4ef6\u5faa\u73af\u548cXHR\u5bf9\u8c61\uff0c\u4ee5\u53ca\u5b83\u4eec\u662f\u5982\u4f55\u901a\u8fc7\u5f02\u6b65\u7f16\u7a0b\u6a21\u578b\u8fdb\u884c\u4ea4\u4e92\uff0c\u662f\u6bcf\u4e2aJavaScript\u5f00\u53d1\u8005\u5fc5\u987b\u638c\u63e1\u7684\u57fa\u672c\u77e5\u8bc6<\/strong>\u3002\u901a\u8fc7\u8fd9\u4e9b\u77e5\u8bc6\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u6784\u5efa\u66f4\u52a0\u52a8\u6001\u3001\u54cd\u5e94\u5feb\u901f\u3001\u7528\u6237\u4f53\u9a8c\u66f4\u4f73\u7684Web\u5e94\u7528\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>Q1: \u4ec0\u4e48\u662fJavaScript\u4e2d\u7684\u4e8b\u4ef6\u5faa\u73af\uff1f<\/strong><\/p>\n<p>JavaScript\u4e2d\u7684\u4e8b\u4ef6\u5faa\u73af\u662f\u4e00\u79cd\u5904\u7406\u5f02\u6b65\u4ee3\u7801\u6267\u884c\u7684\u673a\u5236\u3002\u5b83\u57fa\u4e8e\u4e8b\u4ef6\u961f\u5217\u548c\u56de\u8c03\u51fd\u6570\u7684\u6982\u5ff5\uff0c\u901a\u8fc7\u4e0d\u65ad\u5730\u5faa\u73af\u68c0\u67e5\u4e8b\u4ef6\u961f\u5217\u4e2d\u662f\u5426\u6709\u5f85\u5904\u7406\u7684\u4e8b\u4ef6\uff0c\u7136\u540e\u6267\u884c\u76f8\u5e94\u7684\u56de\u8c03\u51fd\u6570\u6765\u5b9e\u73b0\u8fd9\u4e00\u673a\u5236\u3002\u4e8b\u4ef6\u5faa\u73af\u7684\u5b58\u5728\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\uff0c\u4f8b\u5982\u5904\u7406\u7528\u6237\u4ea4\u4e92\u3001\u7f51\u7edc\u8bf7\u6c42\u7b49\uff0c\u800c\u4e0d\u4f1a\u963b\u585e\u4ee3\u7801\u7684\u6267\u884c\u3002<\/p>\n<p><strong>Q2: 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XMLHttpRequest()<\/code>\u8bed\u6cd5\u3002\u7136\u540e\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528XHR\u5bf9\u8c61\u7684\u4e00\u7cfb\u5217\u65b9\u6cd5\u6765\u914d\u7f6e\u8bf7\u6c42\u548c\u5904\u7406\u54cd\u5e94\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528<code>open()<\/code>\u65b9\u6cd5\u6765\u6307\u5b9a\u8bf7\u6c42\u7684\u7c7b\u578b\uff08GET\u3001POST\u7b49\uff09\u548cURL\u3002\u7136\u540e\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528<code>send()<\/code>\u65b9\u6cd5\u5c06\u8bf7\u6c42\u53d1\u9001\u5230\u670d\u52a1\u5668\uff0c\u5e76\u4f7f\u7528\u56de\u8c03\u51fd\u6570\u6765\u5904\u7406\u670d\u52a1\u5668\u7684\u54cd\u5e94\u3002\u8fd8\u53ef\u4ee5\u4f7f\u7528<code>setRequestHeader()<\/code>\u65b9\u6cd5\u8bbe\u7f6e\u8bf7\u6c42\u5934\u3002<\/p>\n<p><strong>Q3: 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