url: \u8981\u6c42\u4e3aString\u7c7b\u578b\u7684\u53c2\u6570\uff0c\uff08\u9ed8\u8ba4\u4e3a\u5f53\u524d\u9875\u5730\u5740\uff09\u53d1\u9001\u8bf7\u6c42\u7684\u5730\u5740\u3002
\ntype: \u8981\u6c42\u4e3aString\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u8bf7\u6c42\u65b9\u5f0f\uff08post\u6216get\uff09\u9ed8\u8ba4\u4e3aget\u3002\u6ce8\u610f\u5176\u4ed6http\u8bf7\u6c42\u65b9\u6cd5\uff0c\u4f8b\u5982put\u548c
\ndelete\u4e5f\u53ef\u4ee5\u4f7f\u7528\uff0c\u4f46\u4ec5\u90e8\u5206\u6d4f\u89c8\u5668\u652f\u6301\u3002
\ntimeout: \u8981\u6c42\u4e3aNumber\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u8bbe\u7f6e\u8bf7\u6c42\u8d85\u65f6\u65f6\u95f4\uff08\u6beb\u79d2\uff09\u3002\u6b64\u8bbe\u7f6e\u5c06\u8986\u76d6$.ajaxSetup()\u65b9\u6cd5\u7684\u5168\u5c40\u8bbe
\n\u7f6e\u3002
\nasync\uff1a\u8981\u6c42\u4e3aBoolean\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u9ed8\u8ba4\u8bbe\u7f6e\u4e3atrue\uff0c\u6240\u6709\u8bf7\u6c42\u5747\u4e3a\u5f02\u6b65\u8bf7\u6c42\u3002
\n\u5982\u679c\u9700\u8981\u53d1\u9001\u540c\u6b65\u8bf7\u6c42\uff0c\u8bf7\u5c06\u6b64\u9009\u9879\u8bbe\u7f6e\u4e3afalse\u3002\u6ce8\u610f\uff0c\u540c\u6b65\u8bf7\u6c42\u5c06\u9501\u4f4f\u6d4f\u89c8\u5668\uff0c\u7528\u6237\u5176\u4ed6\u64cd\u4f5c\u5fc5\u987b\u7b49
\n\u5f85\u8bf7\u6c42\u5b8c\u6210\u624d\u53ef\u4ee5\u6267\u884c\u3002
\ncache\uff1a\u8981\u6c42\u4e3aBoolean\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u9ed8\u8ba4\u4e3atrue\uff08\u5f53dataType\u4e3ascript\u65f6\uff0c\u9ed8\u8ba4\u4e3afalse\uff09\u3002
\n\u8bbe\u7f6e\u4e3afalse\u5c06\u4e0d\u4f1a\u4ece\u6d4f\u89c8\u5668\u7f13\u5b58\u4e2d\u52a0\u8f7d\u8bf7\u6c42\u4fe1\u606f\u3002
\ndata: \u8981\u6c42\u4e3aObject\u6216String\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u53d1\u9001\u5230\u670d\u52a1\u5668\u7684\u6570\u636e\u3002\u5982\u679c\u5df2\u7ecf\u4e0d\u662f\u5b57\u7b26\u4e32\uff0c\u5c06\u81ea\u52a8\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u683c
\n\u5f0f\u3002get\u8bf7\u6c42\u4e2d\u5c06\u9644\u52a0\u5728url\u540e\u3002\u9632\u6b62\u8fd9\u79cd\u81ea\u52a8\u8f6c\u6362\uff0c\u53ef\u4ee5\u67e5\u770bprocessData\u9009\u9879\u3002\u5bf9\u8c61\u5fc5\u987b\u4e3akey\/value\u683c
\n\u5f0f\uff0c\u4f8b\u5982{foo1:”bar1″,foo2:”bar2″}\u8f6c\u6362\u4e3a&foo1=bar1&foo2=bar2\u3002\u5982\u679c\u662f\u6570\u7ec4\uff0cJQuery\u5c06\u81ea\u52a8\u4e3a\u4e0d\u540c
\n\u503c\u5bf9\u5e94\u540c\u4e00\u4e2a\u540d\u79f0\u3002\u4f8b\u5982{foo:[“bar1″,”bar2”]}\u8f6c\u6362\u4e3a&foo=bar1&foo=bar2\u3002
\ndataType: \u8981\u6c42\u4e3aString\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u9884\u671f\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6570\u636e\u7c7b\u578b\u3002\u5982\u679c\u4e0d\u6307\u5b9a\uff0cJQuery\u5c06\u81ea\u52a8\u6839\u636ehttp\u5305mime
\n\u4fe1\u606f\u8fd4\u56deresponseXML\u6216responseText\uff0c\u5e76\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\u53c2\u6570\u4f20\u9012\u3002
\n\u53ef\u7528\u7684\u7c7b\u578b\u5982\u4e0b\uff1a
\nxml\uff1a\u8fd4\u56deXML\u6587\u6863\uff0c\u53ef\u7528JQuery\u5904\u7406\u3002
\nhtml\uff1a\u8fd4\u56de\u7eaf\u6587\u672cHTML\u4fe1\u606f\uff1b\u5305\u542b\u7684script\u6807\u7b7e\u4f1a\u5728\u63d2\u5165DOM\u65f6\u6267\u884c\u3002
\nscript\uff1a\u8fd4\u56de\u7eaf\u6587\u672cJavaScript\u4ee3\u7801\u3002\u4e0d\u4f1a\u81ea\u52a8\u7f13\u5b58\u7ed3\u679c\u3002\u9664\u975e\u8bbe\u7f6e\u4e86cache\u53c2\u6570\u3002\u6ce8\u610f\u5728\u8fdc\u7a0b\u8bf7\u6c42
\n\u65f6\uff08\u4e0d\u5728\u540c\u4e00\u4e2a\u57df\u4e0b\uff09\uff0c\u6240\u6709post\u8bf7\u6c42\u90fd\u5c06\u8f6c\u4e3aget\u8bf7\u6c42\u3002
\njson\uff1a\u8fd4\u56deJSON\u6570\u636e\u3002
\njsonp\uff1aJSONP\u683c\u5f0f\u3002\u4f7f\u7528SONP\u5f62\u5f0f\u8c03\u7528\u51fd\u6570\u65f6\uff0c\u4f8b\u5982myurl?callback=?\uff0cJQuery\u5c06\u81ea\u52a8\u66ff\u6362\u540e\u4e00\u4e2a
\n\u201c?\u201d\u4e3a\u6b63\u786e\u7684\u51fd\u6570\u540d\uff0c\u4ee5\u6267\u884c\u56de\u8c03\u51fd\u6570\u3002
\ntext\uff1a\u8fd4\u56de\u7eaf\u6587\u672c\u5b57\u7b26\u4e32\u3002
\nbeforeSend\uff1a\u8981\u6c42\u4e3aFunction\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u53d1\u9001\u8bf7\u6c42\u524d\u53ef\u4ee5\u4fee\u6539XMLHttpRequest\u5bf9\u8c61\u7684\u51fd\u6570\uff0c\u4f8b\u5982\u6dfb\u52a0\u81ea\u5b9a\u4e49
\nHTTP\u5934\u3002\u5728beforeSend\u4e2d\u5982\u679c\u8fd4\u56defalse\u53ef\u4ee5\u53d6\u6d88\u672c\u6b21ajax\u8bf7\u6c42\u3002XMLHttpRequest\u5bf9\u8c61\u662f\u60df\u4e00\u7684\u53c2
\n\u6570\u3002
\nfunction(XMLHttpRequest){
\nthis; \/\/\u8c03\u7528\u672c\u6b21ajax\u8bf7\u6c42\u65f6\u4f20\u9012\u7684options\u53c2\u6570
\n}
\ncomplete\uff1a\u8981\u6c42\u4e3aFunction\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u8bf7\u6c42\u5b8c\u6210\u540e\u8c03\u7528\u7684\u56de\u8c03\u51fd\u6570\uff08\u8bf7\u6c42\u6210\u529f\u6216\u5931\u8d25\u65f6\u5747\u8c03\u7528\uff09\u3002
\n\u53c2\u6570\uff1aXMLHttpRequest\u5bf9\u8c61\u548c\u4e00\u4e2a\u63cf\u8ff0\u6210\u529f\u8bf7\u6c42\u7c7b\u578b\u7684\u5b57\u7b26\u4e32\u3002
\nfunction(XMLHttpRequest, textStatus){
\nthis; \/\/\u8c03\u7528\u672c\u6b21ajax\u8bf7\u6c42\u65f6\u4f20\u9012\u7684options\u53c2\u6570
\n}
\nsuccess\uff1a\u8981\u6c42\u4e3aFunction\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u8bf7\u6c42\u6210\u529f\u540e\u8c03\u7528\u7684\u56de\u8c03\u51fd\u6570\uff0c\u6709\u4e24\u4e2a\u53c2\u6570\u3002
\n(1)\u7531\u670d\u52a1\u5668\u8fd4\u56de\uff0c\u5e76\u6839\u636edataType\u53c2\u6570\u8fdb\u884c\u5904\u7406\u540e\u7684\u6570\u636e\u3002
\n(2)\u63cf\u8ff0\u72b6\u6001\u7684\u5b57\u7b26\u4e32\u3002
\nfunction(data, textStatus){
\n\/\/data\u53ef\u80fd\u662fxmlDoc\u3001jsonObj\u3001html\u3001text\u7b49\u7b49
\nthis; \/\/\u8c03\u7528\u672c\u6b21ajax\u8bf7\u6c42\u65f6\u4f20\u9012\u7684options\u53c2\u6570
\nerror\uff1a\u8981\u6c42\u4e3aFunction\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u8bf7\u6c42\u5931\u8d25\u65f6\u88ab\u8c03\u7528\u7684\u51fd\u6570\u3002\u8be5\u51fd\u6570\u67093\u4e2a\u53c2\u6570\uff0c\u5373XMLHttpRequest\u5bf9\u8c61\u3001\u9519
\n\u8bef\u4fe1\u606f\u3001\u6355\u83b7\u7684\u9519\u8bef\u5bf9\u8c61(\u53ef\u9009)\u3002
\najax\u4e8b\u4ef6\u51fd\u6570\u5982\u4e0b\uff1a
\nfunction(XMLHttpRequest, textStatus, errorThrown){
\n\/\/\u901a\u5e38\u60c5\u51b5\u4e0btextStatus\u548cerrorThrown\u53ea\u6709\u5176\u4e2d\u4e00\u4e2a\u5305\u542b\u4fe1\u606f
\nthis; \/\/\u8c03\u7528\u672c\u6b21ajax\u8bf7\u6c42\u65f6\u4f20\u9012\u7684options\u53c2\u6570
\n}
\ncontentType\uff1a\u8981\u6c42\u4e3aString\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5f53\u53d1\u9001\u4fe1\u606f\u81f3\u670d\u52a1\u5668\u65f6\uff0c\u5185\u5bb9\u7f16\u7801\u7c7b\u578b\u9ed8\u8ba4
\n\u4e3a”application\/x-www-form-urlencoded”\u3002\u8be5\u9ed8\u8ba4\u503c\u9002\u5408\u5927\u591a\u6570\u5e94\u7528\u573a\u5408\u3002
\ndataFilter\uff1a\u8981\u6c42\u4e3aFunction\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u7ed9Ajax\u8fd4\u56de\u7684\u539f\u59cb\u6570\u636e\u8fdb\u884c\u9884\u5904\u7406\u7684\u51fd\u6570\u3002
\n\u63d0\u4f9bdata\u548ctype\u4e24\u4e2a\u53c2\u6570\u3002data\u662fAjax\u8fd4\u56de\u7684\u539f\u59cb\u6570\u636e\uff0ctype\u662f\u8c03\u7528jQuery.ajax\u65f6\u63d0\u4f9b\u7684
\ndataType\u53c2\u6570\u3002\u51fd\u6570\u8fd4\u56de\u7684\u503c\u5c06\u7531jQuery\u8fdb\u4e00\u6b65\u5904\u7406\u3002
\nfunction(data, type){
\n\/\/\u8fd4\u56de\u5904\u7406\u540e\u7684\u6570\u636e
\nreturn data;
\n}
\nglobal\uff1a\u8981\u6c42\u4e3aBoolean\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u9ed8\u8ba4\u4e3atrue\u3002\u8868\u793a\u662f\u5426\u89e6\u53d1\u5168\u5c40ajax\u4e8b\u4ef6\u3002\u8bbe\u7f6e\u4e3afalse\u5c06\u4e0d\u4f1a\u89e6\u53d1\u5168\u5c40
\najax\u4e8b\u4ef6\uff0cajaxStart\u6216ajaxStop\u53ef\u7528\u4e8e\u63a7\u5236\u5404\u79cdajax\u4e8b\u4ef6\u3002
\nifModified\uff1a\u8981\u6c42\u4e3aBoolean\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u9ed8\u8ba4\u4e3afalse\u3002\u4ec5\u5728\u670d\u52a1\u5668\u6570\u636e\u6539\u53d8\u65f6\u83b7\u53d6\u65b0\u6570\u636e\u3002
\n\u670d\u52a1\u5668\u6570\u636e\u6539\u53d8\u5224\u65ad\u7684\u4f9d\u636e\u662fLast-Modified\u5934\u4fe1\u606f\u3002\u9ed8\u8ba4\u503c\u662ffalse\uff0c\u5373\u5ffd\u7565\u5934\u4fe1\u606f\u3002
\njsonp\uff1a\u8981\u6c42\u4e3aString\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u5728\u4e00\u4e2ajsonp\u8bf7\u6c42\u4e2d\u91cd\u5199\u56de\u8c03\u51fd\u6570\u7684\u540d\u5b57\u3002
\n\u8be5\u503c\u7528\u6765\u66ff\u4ee3\u5728”callback=?”\u8fd9\u79cdGET\u6216POST\u8bf7\u6c42\u4e2dURL\u53c2\u6570\u91cc\u7684”callback”\u90e8\u5206\uff0c\u4f8b\u5982
\n{jsonp:’onJsonPLoad’}\u4f1a\u5bfc\u81f4\u5c06”onJsonPLoad=?”\u4f20\u7ed9\u670d\u52a1\u5668\u3002
\nusername\uff1a\u8981\u6c42\u4e3aString\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u7528\u4e8e\u54cd\u5e94HTTP\u8bbf\u95ee\u8ba4\u8bc1\u8bf7\u6c42\u7684\u7528\u6237\u540d\u3002
\npassword\uff1a\u8981\u6c42\u4e3aString\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u7528\u4e8e\u54cd\u5e94HTTP\u8bbf\u95ee\u8ba4\u8bc1\u8bf7\u6c42\u7684\u5bc6\u7801\u3002
\nprocessData\uff1a\u8981\u6c42\u4e3aBoolean\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u9ed8\u8ba4\u4e3atrue\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u53d1\u9001\u7684\u6570\u636e\u5c06\u88ab\u8f6c\u6362\u4e3a\u5bf9\u8c61\uff08\u4ece\u6280\u672f\u89d2\u5ea6
\n\u6765\u8bb2\u5e76\u975e\u5b57\u7b26\u4e32\uff09\u4ee5\u914d\u5408\u9ed8\u8ba4\u5185\u5bb9\u7c7b\u578b”application\/x-www-form-urlencoded”\u3002\u5982\u679c\u8981\u53d1\u9001DOM
\n\u6811\u4fe1\u606f\u6216\u8005\u5176\u4ed6\u4e0d\u5e0c\u671b\u8f6c\u6362\u7684\u4fe1\u606f\uff0c\u8bf7\u8bbe\u7f6e\u4e3afalse\u3002
\nscriptCharset\uff1a\u8981\u6c42\u4e3aString\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u53ea\u6709\u5f53\u8bf7\u6c42\u65f6dataType\u4e3a”jsonp”\u6216\u8005”script”\uff0c\u5e76\u4e14type\u662fGET\u65f6
\n\u624d\u4f1a\u7528\u4e8e\u5f3a\u5236\u4fee\u6539\u5b57\u7b26\u96c6(charset)\u3002\u901a\u5e38\u5728\u672c\u5730\u548c\u8fdc\u7a0b\u7684\u5185\u5bb9\u7f16\u7801\u4e0d\u540c\u65f6\u4f7f\u7528\u3002<\/p>\n
\u6848\u4f8b\u4ee3\u7801\uff1a
\n$(function(){
\n$(‘#send’).click(function(){
\n$.ajax({
\ntype: “GET”,
\nurl: “test.json”,
\ndata: {username:$(“#username”).val(), content:$(“#content”).val()},
\ndataType: “json”,
\nsuccess: function(data){
\n$(‘#resText’).empty(); \/\/\u6e05\u7a7aresText\u91cc\u9762\u7684\u6240\u6709\u5185\u5bb9
\nvar html = ”;
\n$.each(data, function(commentIndex, comment){
\nhtml += ‘<div class=”comment”><h6>’ + comment[‘username’]
\n+ ‘:<\/h6><p class=”para”‘ + comment[‘content’]
\n+ ‘<\/p><\/div>’;
\n});
\n$(‘#resText’).html(html);
\n}
\n});
\n});
\n});<\/p>\n
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