\u539f\u751fjs XMLhttprequest\u8bf7\u6c42onreadychange\u6267\u884c\u4e24\u6b21<\/strong><\/div>\n
\u6700\u8fd1\u505a\u5230\u4e00\u4e2a\u9875\u9762\u9700\u8981\u517c\u5bb9IE\uff0c\u7136\u540e\u5c31\u5199\u4e86\u4e00\u4e2a\u539f\u751f XMLhttprequest\u8bf7\u6c42<\/p>\n
\u76f4\u63a5\u4e0a\u9519\u8bef\u4ee3\u7801<\/p>\n
xmlHttp = new XMLHttpRequest();\r\n xmlHttp.open(\"post\",\"https:\/\/baidu.com\/mianxiang\/baidu\/biancheng\");\r\n xmlHttp.setRequestHeader(\"Content-Type\",\"application\/json\");\r\n xmlHttp.send(XXXXXXXXXX) ;\r\n xmlHttp.onreadystatechange = function () {\r\n if(this.status==200){\r\n console.log(\"responseText\",this.responseText);\r\n }\r\n };<\/pre>\n
\u5728\u4e0a\u9762\u4ee3\u7801\u4e2d\uff0c\u5f53status == 200 \u7684console.log\u5185\u5bb9\u6bcf\u6b21\u8bf7\u6c42\uff0c\u90fd\u4f1a\u5728\u63a7\u5236\u53f0\u6253\u5370\u4e24\u6b21\uff0c\u4e5f\u5c31\u662f\u8bf4\u91cc\u9762\u7684\u903b\u8f91\u4f1a\u88ab\u6267\u884c\u4e24\u6b21\uff0c\u767e\u5ea6\u4e86\u5f88\u591a\u90fd\u6ca1\u6709\u53d1\u73b0\u76f8\u4f3c\u95ee\u9898\uff0c\u548c\u5177\u4f53\u89e3\u51b3\u529e\u6cd5\u3002<\/p>\n
xmlHttp = new XMLHttpRequest();\r\n xmlHttp.open(\"post\",\"https:\/\/baidu.com\/mianxiang\/baidu\/biancheng\");\r\n xmlHttp.setRequestHeader(\"Content-Type\",\"application\/json\");\r\n xmlHttp.send(XXXXXXXXXX) ;\r\n xmlHttp.onreadystatechange = function () {\r\n if(xmlHttp.readyState == 4 && this.status==200){\r\n console.log(\"responseText\",this.responseText);\r\n }\r\n };<\/pre>\n
\u6700\u540e\u5076\u7136\u53d1\u73b0\u4e86\u548c\u6b63\u786e\u4ee3\u7801\u7684\u5dee\u8ddd\uff0c\u8865\u4e0a\u201c xmlHttp.readyState == 4 \u201d<\/p>\n
\u6267\u884c\u4e00\u6b21\uff0c\u95ee\u9898\u89e3\u51b3\u3002<\/p>\n
\u5206\u6790\uff0c\u53ef\u80fd\u662f\u56e0\u4e3a\u5728\u6ca1\u6709\u6dfb\u52a0\u5224\u65adreadyState\u65f6\uff0c\u5f53options\u9884\u8bf7\u6c42\u6267\u884c\u65f6\uff0c\u4e5f\u4f1a\u6709\u4e00\u6b21\u72b6\u6001\u7801200\u7684\uff0c\u6240\u4ee5\u4f1a\u88ab\u6267\u884c\u4e24\u6b21\uff0c\u4f46\u662f\u7591\u60d1\u70b9\u662f\u9884\u8bf7\u6c42\u4e0d\u4f1a\u8fd4\u56de\u6570\u636e\uff0c\u4f46\u662f\u5728\u6253\u5370\u65f6\uff0c\u4e24\u6b21\u6253\u5370\u90fd\u662f\u6709\u6570\u636e\u7684\u3002<\/p>\n
\u67e5\u8d44\u6599+\u8bf7\u6559\u5927\u4f6c = get \u77e5\u8bc6<\/p>\n
\u77e5\u8bc6\uff1a<\/p>\n
\u521b\u5efaxmlhttprequest\u5bf9\u8c61\u4e4b\u540e\u6ca1\u6709\u8c03\u7528open\u4e4b\u524dreadystate\u503c\u4e3a0\uff0c\u8c03\u7528open()\u4e4b\u540e\u5c31\u53d8\u4e3a1\u4e86\uff0c\u5e76\u4e14\u6b64\u65f6onreadystatechange\u51fd\u6570\u4e0eopen()\u51e0\u4e4e\u662f\u540c\u65f6\u6267\u884c\u7684\u3002<\/li>\n
\u5728\u4e4b\u540e\u8c03\u7528send\u65b9\u6cd5\u4e4b\u540e\uff0c\u5728startHttpRequest\u51fd\u6570\u4e2dreadystate\u503c\u4ecd\u4e3a1\uff0c\u800c\u8c03\u7528send\u65b9\u6cd5\u4e4b\u540e\u5e94\u8be5\u67092\uff0c3\uff0c4\u4e09\u4e2a\u72b6\u6001\uff0c\u800c\u53ea\u6709\u5728startHttpRequest\u51fd\u6570\u7528alert\u8bed\u53e5\u624d\u53ef\u4ee5\u89c2\u5bdf\u52303\u4e2a\u503c\uff01<\/li>\n
\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f\u8fd9\u662f\u56e0\u4e3a\u5728startHttpRequest\u51fd\u6570\u4e2d\u5f53\u89e3\u6790\u5230send\u8fd9\u4e00\u53e5\u65f6\uff0c\u5e76\u6ca1\u6709\u771f\u6b63\u5f00\u59cb\u6267\u884csend\u6267\u884c\u3002<\/li>\n
\u53ea\u6709send\u6267\u884c\uff0c\u624d\u53ef\u4ee5\u5728onreadystatechange\u51fd\u6570\u89c2\u5bdf\u5230\u72b6\u6001\u503c\u7684\u53d8\u5316\u3002<\/li>\n
readystate\u4e0d\u662f\u53d1\u9001\u7684\u72b6\u6001\uff0c\u5b83\u662f\u51c6\u5907\u53d1\u9001\u7684\u72b6\u6001\uff0c\u8981\u628a\u5b83\u60f3\u50cf\u6210\u201c\u4eba\u95f4\u5927\u70ae\u4e00\u7ea7\u51c6\u5907\u3001\u4e8c\u7ea7\u51c6\u5907\u3001\u653e\u201d\u8fd9\u6837\u7684\u53e3\u53f7\uff0c\u4e0d\u662f\u8bf7\u6c42\u53d1\u9001\u672c\u8eab\u3002<\/li>\n
\u540c\u65f6xmlhttp\u4e5f\u4e0d\u662f\u76d1\u542c\u670d\u52a1\u5668\u4fe1\u606f\uff0c\u5b83\u662f\u5728send\u7684\u65f6\u5019\u83b7\u53d6\u670d\u52a1\u5668\u8fd4\u56de\u7684\u72b6\u6001\u4fe1\u606f\u800c\u5df2\uff0c\u53ea\u6709\u4e00\u6b21\uff0c\u76d1\u542c\u5219\u662f\u4e00\u76f4\u5728\u89c2\u5bdf\u72b6\u6001\u3002<\/li>\n
\u5173\u4e8ereadyState\u4e0d\u540c\u72b6\u6001\u603b\u7ed3<\/strong><\/div>\n
(0) \u672a\u521d\u59cb\u5316<\/strong><\/span><\/div>\n
\u6b64\u9636\u6bb5\u786e\u8ba4XMLHttpRequest\u5bf9\u8c61\u662f\u5426\u521b\u5efa\uff0c\u5e76\u4e3a\u8c03\u7528open()\u65b9\u6cd5\u8fdb\u884c\u672a\u521d\u59cb\u5316\u4f5c\u597d\u51c6\u5907\u3002<\/p>\n
\u503c\u4e3a0\u8868\u793a\u5bf9\u8c61\u5df2\u7ecf\u5b58\u5728\uff0c\u5426\u5219\u6d4f\u89c8\u5668\u4f1a\u62a5\u9519\uff0d\uff0d\u5bf9\u8c61\u4e0d\u5b58\u5728\u3002<\/p>\n
(1) \u8f7d\u5165<\/strong><\/span><\/div>\n
\u6b64\u9636\u6bb5\u5bf9XMLHttpRequest\u5bf9\u8c61\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u5373\u8c03\u7528open()\u65b9\u6cd5\uff0c\u6839\u636e\u53c2\u6570(method,url,true)\u5b8c\u6210\u5bf9\u8c61\u72b6\u6001\u7684\u8bbe\u7f6e\u3002<\/p>\n
\u5e76\u8c03\u7528send()\u65b9\u6cd5\u5f00\u59cb\u5411\u670d\u52a1\u7aef\u53d1\u9001\u8bf7\u6c42\u3002\u503c\u4e3a1\u8868\u793a\u6b63\u5728\u5411\u670d\u52a1\u7aef\u53d1\u9001\u8bf7\u6c42\u3002<\/p>\n
(2) \u8f7d\u5165\u5b8c\u6210<\/strong><\/span><\/div>\n
\u6b64\u9636\u6bb5\u63a5\u6536\u670d\u52a1\u5668\u7aef\u7684\u54cd\u5e94\u6570\u636e\u3002\u4f46\u83b7\u5f97\u7684\u8fd8\u53ea\u662f\u670d\u52a1\u7aef\u54cd\u5e94\u7684\u539f\u59cb\u6570\u636e\uff0c\u5e76\u4e0d\u80fd\u76f4\u63a5\u5728\u5ba2\u6237\u7aef\u4f7f\u7528\u3002<\/p>\n
\u503c\u4e3a2\u8868\u793a\u5df2\u7ecf\u63a5\u6536\u5b8c\u5168\u90e8\u54cd\u5e94\u6570\u636e\u3002\u5e76\u4e3a\u4e0b\u4e00\u9636\u6bb5\u5bf9\u6570\u636e\u89e3\u6790\u4f5c\u597d\u51c6\u5907\u3002<\/p>\n
(3) \u4ea4\u4e92<\/strong><\/span><\/div>\n
\u6b64\u9636\u6bb5\u89e3\u6790\u63a5\u6536\u5230\u7684\u670d\u52a1\u5668\u7aef\u54cd\u5e94\u6570\u636e\u3002<\/p>\n
\u5373\u6839\u636e\u670d\u52a1\u5668\u7aef\u54cd\u5e94\u5934\u90e8\u8fd4\u56de\u7684MIME\u7c7b\u578b\u628a\u6570\u636e\u8f6c\u6362\u6210\u80fd\u901a\u8fc7responseBody\u3001responseText\u6216responseXML\u5c5e\u6027\u5b58\u53d6\u7684\u683c\u5f0f\uff0c\u4e3a\u5728\u5ba2\u6237\u7aef\u8c03\u7528\u4f5c\u597d\u51c6\u5907\u3002<\/p>\n
\u72b6\u60013\u8868\u793a\u6b63\u5728\u89e3\u6790\u6570\u636e\u3002<\/p>\n
(4) \u5b8c\u6210<\/strong><\/span><\/div>\n
\u6b64\u9636\u6bb5\u786e\u8ba4\u5168\u90e8\u6570\u636e\u90fd\u5df2\u7ecf\u89e3\u6790\u4e3a\u5ba2\u6237\u7aef\u53ef\u7528\u7684\u683c\u5f0f\uff0c\u89e3\u6790\u5df2\u7ecf\u5b8c\u6210\u3002<\/p>\n
\u503c\u4e3a4\u8868\u793a\u6570\u636e\u89e3\u6790\u5b8c\u6bd5\uff0c\u53ef\u4ee5\u901a\u8fc7XMLHttpRequest\u5bf9\u8c61\u7684\u76f8\u5e94\u5c5e\u6027\u53d6\u5f97\u6570\u636e\u3002<\/p>\n
\u8fd9\u4e2a\u65f6\u5019\u518d\u56de\u987e\u4e4b\u524d\u4e3a\u4f55\u6267\u884c\u4e24\u6b21onreadystatechange\uff0c \u56e0\u4e3a\u5f53state\u6bcf\u6b21\u53d8\u5316\u7684\u65f6\u5019\u90fd\u4f1a\u6267\u884c\u5230onreadystatechange\uff0c\u5176\u5b9e\u662freadyState\u6bcf\u6b21\u53d8\u5316\u90fd\u4f1a\u6709\u6267\u884conreadystatechange\uff0c\u56e0\u4e3a\u6211\u5224\u65ad\u4e86this.status == 200 \uff0c\u6240\u4ee5\u5f53\u670d\u52a1\u5668\u54cd\u5e94\u4e86\u4e4b\u540e\u8fd4\u56de\u4e86200\u7684\u72b6\u6001\u7801\uff0c\u624d\u4f1a\u6267\u884cconsole.log()\uff0c\u624d\u6709\u4e0a\u9762\u7684\u6267\u884c\u4e24\u6b21\u7684\u95ee\u9898\u3002<\/p>\n
\u81f3\u6b64\u95ee\u9898\u89e3\u51b3\uff01\uff01\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6700\u8fd1\u505a\u5230\u4e00\u4e2a\u9875\u9762\u9700\u8981\u517c\u5bb9IE\uff0c\u7136\u540e\u5c31\u5199\u4e86\u4e00\u4e2a\u539f\u751f XMLhttprequest\u8bf7\u6c42 \u76f4\u63a5\u4e0a\u9519\u8bef\u4ee3\u7801 xmlHt […]<\/p>\n","protected":false},"author":362,"featured_media":256642,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-265259","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread"],"acf":[],"_links":{"self":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts\/265259","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/users\/362"}],"replies":[{"embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/comments?post=265259"}],"version-history":[{"count":3,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts\/265259\/revisions"}],"predecessor-version":[{"id":265265,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/posts\/265259\/revisions\/265265"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/media\/256642"}],"wp:attachment":[{"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/media?parent=265259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/categories?post=265259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gulass.cn\/wp-json\/wp\/v2\/tags?post=265259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}