{"id":1096,"date":"2017-03-16T15:55:00","date_gmt":"2017-03-16T07:55:00","guid":{"rendered":"http:\/\/www.qdabc.cn\/?p=1096"},"modified":"2017-03-16T15:55:00","modified_gmt":"2017-03-16T07:55:00","slug":"%e5%ae%9e%e7%8e%b0ajax%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%ad%a5%e9%aa%a4","status":"publish","type":"post","link":"http:\/\/www.qdabc.cn\/?p=1096","title":{"rendered":"\u5b9e\u73b0AJAX\u7684\u57fa\u672c\u6b65\u9aa4"},"content":{"rendered":"

AJAX\uff08Asynchronous JavaScript and XML\uff09\uff1a\u662f\u6307\u4e00\u79cd\u521b\u5efa\u4ea4\u4e92\u5f0f\u7f51\u9875\u5e94\u7528\u7684\u7f51\u9875\u5f00\u53d1\u6280\u672f\uff0c\u901a\u8fc7\u5728\u540e\u53f0\u4e0e\u670d\u52a1\u5668\u8fdb\u884c\u5c11\u91cf\u6570\u636e\u4ea4\u6362\uff0cAJAX \u53ef\u4ee5\u4f7f\u7f51\u9875\u5b9e\u73b0\u5f02\u6b65\u66f4\u65b0\u3002\u8fd9\u5c31\u610f\u5473\u7740\u53ef\u4ee5\u5728\u4e0d\u91cd\u65b0\u52a0\u8f7d\u6574\u4e2a\u7f51\u9875\u7684\u60c5\u51b5\u4e0b\uff0c\u5bf9\u7f51\u9875\u7684\u5c40\u90e8\u8fdb\u884c\u66f4\u65b0\u3002<\/p>\n

\u5b9e\u73b0AJAX\u7684\u57fa\u672c\u6b65\u9aa4\uff1a<\/p>\n

\u4e00\u3001\u521b\u5efaXMLHttpRequest\u5bf9\u8c61<\/p>\n

\u6240\u6709\u73b0\u4ee3\u6d4f\u89c8\u5668\uff08IE7+\u3001Firefox\u3001Chrome\u3001Safari \u4ee5\u53ca Opera\uff09\u5747\u652f\u6301XMLHttpRequest \u5bf9\u8c61\uff0c\u800cIE5 \u548c IE6 \u4f7f\u7528 \u7684\u662fActiveXObject\u3002<\/p>\n

\u5728\u73b0\u4ee3\u6d4f\u89c8\u5668\u4e2d\u521b\u5efaXMLHttpRequest\u5bf9\u8c61\u7684\u8bed\u6cd5\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

var xhr = new XMLHttpRequest()\uff1b<\/p>\n

\u5728IE5 \u548c IE6\u4e2d\u5219\u4f7f\u7528ActiveXObject \u5bf9\u8c61\uff1a<\/p>\n

var xhr = new ActiveXObject(“Microsoft.XMLHTTP”)\uff1b<\/p>\n

\u4e3a\u4e86\u517c\u5bb9\u6240\u6709\u7684\u6d4f\u89c8\u5668\uff0c\u5224\u65ad\u6d4f\u89c8\u5668\u662f\u5426\u652f\u6301XMLHttpRequest \u5bf9\u8c61\u3002<\/p>\n

var xhr;\r\nif (window.XMLHttpRequest){\r\n    \/\/ \u6807\u51c6\u6d4f\u89c8\u5668\r\n    xhr = new XMLHttpRequest();\r\n}else{\r\n    \/\/ IE6, IE5\r\n    xhr = new ActiveXObject(\"Microsoft.XMLHTTP\");\r\n}<\/pre>\n
\u4e8c\u3001\u521b\u5efa\u4e00\u4e2a\u65b0\u7684HTTP\u8bf7\u6c42,\u5e76\u6307\u5b9a\u8bf7\u6c42\u7684\u65b9\u6cd5\u3001URL\u3001\u662f\u5426\u5f02\u6b65\u5904\u7406\u8bf7\u6c42\u53ca\u9a8c\u8bc1\u4fe1\u606f<\/p>\n
xhr.open(method,URL,flag,username,userpass);<\/p>\n
method\uff1a\u8bf7\u6c42\u7684\u7c7b\u578b\uff08GET\u3001POST\u3001PUT\u3001DELETE\u3001HEAD……\uff09<\/p>\n
URL\uff1a\u6587\u4ef6\u5728\u670d\u52a1\u5668\u4e0a\u7684\u4f4d\u7f6e<\/p>\n
flag\uff1a\u662f\u5426\u5f02\u6b65\u8bf7\u6c42\u3002\u53ef\u9009\u53c2\u6570\uff0c\u53c2\u6570\u503c\u4e3a\u5e03\u5c14\u7c7b\u578b\u3002true\u8868\u793a\u5f02\u6b65\u65b9\u5f0f\u3001false\u8868\u793a\u540c\u6b65\u65b9\u5f0f\uff0c\u9ed8\u8ba4\u4e3atrue\u3002<\/p>\n
username\uff1a\u8be5\u53c2\u6570\u4e3a\u53ef\u9009\u53c2\u6570\uff0c\u7528\u4e8e\u8f93\u5165\u7528\u6237\u540d\u3002\u5982\u679c\u670d\u52a1\u5668\u9700\u8981\u9a8c\u8bc1\uff0c\u5219\u5fc5\u987b\u4f7f\u7528\u8be5\u53c2\u6570\u3002<\/p>\n
userpass\uff1a\u8be5\u53c2\u6570\u4e3a\u53ef\u9009\u53c2\u6570\uff0c\u7528\u4e8e\u8f93\u5165\u5bc6\u7801\u3002\u5982\u679c\u670d\u52a1\u5668\u9700\u8981\u9a8c\u8bc1\uff0c\u5219\u5fc5\u987b\u4f7f\u7528\u8be5\u53c2\u6570\u3002<\/p>\n
\u4e09\u3001\u4e3aonreadystatechange \u4e8b\u4ef6\u7ed1\u5b9a\u65b9\u6cd5\uff0c\u76d1\u542c\u72b6\u6001\u7684\u6539\u53d8<\/p>\n
xhr.onreadystatechange = function(){\r\n    if(xhr.readyState === 4 && xhr.status === 200){\r\n        var result = xhr.responseText;\r\n    }\r\n}<\/pre>\n
readyState\u5c5e\u6027\uff1a\u8868\u793a\u8bf7\u6c42\/\u54cd\u5e94\u8fc7\u7a0b\u7684\u5f53\u524d\u6d3b\u52a8\u9636\u6bb5<\/p>\n
0\uff1a\u672a\u521d\u59cb\u5316\u3002\u5c1a\u672a\u8c03\u7528 open()\u65b9\u6cd5\u3002<\/p>\n
1\uff1a\u542f\u52a8\u3002\u5df2\u7ecf\u8c03\u7528 open()\u65b9\u6cd5\uff0c\u4f46\u5c1a\u672a\u8c03\u7528 send()\u65b9\u6cd5\u3002<\/p>\n
2\uff1a\u53d1\u9001\u3002\u5df2\u7ecf\u8c03\u7528 send()\u65b9\u6cd5\uff0c\u4f46\u5c1a\u672a\u63a5\u6536\u5230\u54cd\u5e94\u3002<\/p>\n
3\uff1a\u63a5\u6536\u3002\u5df2\u7ecf\u63a5\u6536\u5230\u90e8\u5206\u54cd\u5e94\u6570\u636e\u3002<\/p>\n
4\uff1a\u5b8c\u6210\u3002\u5df2\u7ecf\u63a5\u6536\u5230\u5168\u90e8\u54cd\u5e94\u6570\u636e\uff0c\u800c\u4e14\u5df2\u7ecf\u53ef\u4ee5\u5728\u5ba2\u6237\u7aef\u4f7f\u7528\u4e86\u3002<\/p>\n
\u53ea\u6709\u5728XMLHttpRequest\u5bf9\u8c61\u5b8c\u6210\u4e86\u4ee5\u4e0a5\u4e2a\u6b65\u9aa4\u4e4b\u540e\uff0c\u624d\u53ef\u4ee5\u83b7\u53d6\u4ece\u670d\u52a1\u5668\u7aef\u8fd4\u56de\u7684\u6570\u636e\u3002<\/p>\n
status\u5c5e\u6027\uff1a\u54cd\u5e94\u7684 HTTP \u72b6\u6001\u7801<\/p>\n
200\uff1a\u54cd\u5e94\u6210\u529f<\/p>\n
301\uff1a\u6c38\u4e45\u91cd\u5b9a\u5411\/\u6c38\u4e45\u8f6c\u79fb<\/p>\n
302\uff1a\u4e34\u65f6\u91cd\u5b9a\u5411\/\u4e34\u65f6\u8f6c\u79fb<\/p>\n
304\uff1a\u672c\u6b21\u83b7\u53d6\u5185\u5bb9\u662f\u8bfb\u53d6\u7f13\u5b58\u4e2d\u7684\u6570\u636e<\/p>\n
400\uff1a\u8bf7\u6c42\u53c2\u6570\u9519\u8bef<\/p>\n
401\uff1a\u65e0\u6743\u9650\u8bbf\u95ee<\/p>\n
404\uff1a\u8bbf\u95ee\u7684\u8d44\u6e90\u4e0d\u5b58\u5728<\/p>\n
……<\/p>\n
\u56db\u3001\u53d1\u9001HTTP\u8bf7\u6c42<\/p>\n
xhq.send(data);<\/p>\n
\u5176\u4e2ddata\u662f\u4e2a\u53ef\u9009\u53c2\u6570\uff0c\u8bf7\u6c42\u4e3b\u4f53\u53d1\u9001\u7684\u53c2\u6570\uff0c\u5982\u679c\u8bf7\u6c42\u7684\u6570\u636e\u4e0d\u9700\u8981\u53c2\u6570\uff0c\u5373\u53ef\u4ee5\u4f7f\u7528null\u6765\u66ff\u4ee3\u3002<\/p>\n
\u53ea\u6709\u5728\u4f7f\u7528send()\u65b9\u6cd5\u4e4b\u540e\uff0cXMLHttpRequest\u5bf9\u8c61\u7684readyState\u5c5e\u6027\u503c\u624d\u4f1a\u5f00\u59cb\u6539\u53d8\uff0c\u4e5f\u624d\u4f1a\u6fc0\u53d1readystatechange\u4e8b\u4ef6\uff0c\u5e76\u8c03\u7528\u51fd\u6570\u3002<\/p>\n
\u6b22\u8fce\u5206\u4eab\u672c\u6587\uff0c\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u51fa\u5904\uff1a\u524d\u7aefABC<\/a> » \u5b9e\u73b0AJAX\u7684\u57fa\u672c\u6b65\u9aa4<\/a><\/p>","protected":false},"excerpt":{"rendered":"
AJAX\uff08Asynchronous JavaScript and XML\uff09\uff1a\u662f\u6307\u4e00\u79cd\u521b\u5efa\u4ea4\u4e92\u5f0f\u7f51\u9875\u5e94\u7528\u7684\u7f51\u9875\u5f00\u53d1\u6280\u672f\uff0c\u901a\u8fc7\u5728\u540e\u53f0\u4e0e\u670d\u52a1\u5668\u8fdb\u884c\u5c11\u91cf\u6570\u636e\u4ea4\u6362\uff0cAJAX \u53ef\u4ee5\u4f7f\u7f51\u9875\u5b9e\u73b0\u5f02\u6b65\u66f4\u65b0\u3002\u8fd9\u5c31\u610f\u5473\u7740\u53ef […]<\/p>\n","protected":false},"author":1,"featured_media":81,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[8],"_links":{"self":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/1096"}],"collection":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1096"}],"version-history":[{"count":1,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/1096\/revisions"}],"predecessor-version":[{"id":1097,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/posts\/1096\/revisions\/1097"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=\/wp\/v2\/media\/81"}],"wp:attachment":[{"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1096"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1096"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.qdabc.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1096"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}