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3\u3001\u5173\u4e8eajax\u7684\u540d\u5b57<\/strong><\/p>\n

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5\u3001ajax\u6240\u5305\u542b\u7684\u6280\u672f<\/strong><\/p>\n

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1.\u4f7f\u7528CSS\u548cXHTML\u6765\u8868\u793a\u3002<\/p>\n

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6\u3001ajax\u539f\u7406\u548cXmlHttpRequest\u5bf9\u8c61<\/strong><\/p>\n

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\u6240\u4ee5\u6211\u4eec\u5148\u4eceXMLHttpRequest\u8bb2\u8d77\uff0c\u6765\u770b\u770b\u5b83\u7684\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n

\u9996\u5148\uff0c\u6211\u4eec\u5148\u6765\u770b\u770bXMLHttpRequest\u8fd9\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/p>\n

\u5b83\u7684\u5c5e\u6027\u6709\uff1a<\/p>\n

onreadystatechange\u00a0\u00a0\u6bcf\u6b21\u72b6\u6001\u6539\u53d8\u6240\u89e6\u53d1\u4e8b\u4ef6\u7684\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u3002<\/p>\n

responseText\u00a0\u00a0\u00a0\u00a0\u00a0\u4ece\u670d\u52a1\u5668\u8fdb\u7a0b\u8fd4\u56de\u6570\u636e\u7684\u5b57\u7b26\u4e32\u5f62\u5f0f\u3002<\/p>\n

responseXML\u00a0\u00a0 \u00a0\u4ece\u670d\u52a1\u5668\u8fdb\u7a0b\u8fd4\u56de\u7684DOM\u517c\u5bb9\u7684\u6587\u6863\u6570\u636e\u5bf9\u8c61\u3002<\/p>\n

status\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4ece\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6570\u5b57\u4ee3\u7801\uff0c\u6bd4\u5982\u5e38\u89c1\u7684404\uff08\u672a\u627e\u5230\uff09\u548c200\uff08\u5df2\u5c31\u7eea\uff09<\/p>\n

status Text\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f34\u968f\u72b6\u6001\u7801\u7684\u5b57\u7b26\u4e32\u4fe1\u606f<\/p>\n

readyState\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5bf9\u8c61\u72b6\u6001\u503c<\/p>\n

0 (\u672a\u521d\u59cb\u5316)\u00a0\u5bf9\u8c61\u5df2\u5efa\u7acb\uff0c\u4f46\u662f\u5c1a\u672a\u521d\u59cb\u5316\uff08\u5c1a\u672a\u8c03\u7528open\u65b9\u6cd5\uff09<\/p>\n

1 (\u521d\u59cb\u5316)\u00a0\u5bf9\u8c61\u5df2\u5efa\u7acb\uff0c\u5c1a\u672a\u8c03\u7528send\u65b9\u6cd5<\/p>\n

2 (\u53d1\u9001\u6570\u636e) send\u65b9\u6cd5\u5df2\u8c03\u7528\uff0c\u4f46\u662f\u5f53\u524d\u7684\u72b6\u6001\u53cahttp\u5934\u672a\u77e5<\/p>\n

3 (\u6570\u636e\u4f20\u9001\u4e2d)\u00a0\u5df2\u63a5\u6536\u90e8\u5206\u6570\u636e\uff0c\u56e0\u4e3a\u54cd\u5e94\u53cahttp\u5934\u4e0d\u5168\uff0c\u8fd9\u65f6\u901a\u8fc7responseBody\u548cresponseText\u83b7\u53d6\u90e8\u5206\u6570\u636e\u4f1a\u51fa\u73b0\u9519\u8bef\uff0c<\/p>\n

4 (\u5b8c\u6210)\u00a0\u6570\u636e\u63a5\u6536\u5b8c\u6bd5,\u6b64\u65f6\u53ef\u4ee5\u901a\u8fc7\u901a\u8fc7responseXml\u548cresponseText\u83b7\u53d6\u5b8c\u6574\u7684\u56de\u5e94\u6570\u636e<\/p>\n

\u4f46\u662f\uff0c\u7531\u4e8e\u5404\u6d4f\u89c8\u5668\u4e4b\u95f4\u5b58\u5728\u5dee\u5f02\uff0c\u6240\u4ee5\u521b\u5efa\u4e00\u4e2aXMLHttpRequest\u5bf9\u8c61\u53ef\u80fd\u9700\u8981\u4e0d\u540c\u7684\u65b9\u6cd5\u3002\u8fd9\u4e2a\u5dee\u5f02\u4e3b\u8981\u4f53\u73b0\u5728IE\u548c\u5176\u5b83\u6d4f\u89c8\u5668\u4e4b\u95f4\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u6bd4\u8f83\u6807\u51c6\u7684\u521b\u5efaXMLHttpRequest\u5bf9\u8c61\u7684\u65b9\u6cd5\u3002<\/p>\n

function CreateXmlHttp() {\r\n\u00a0 \u00a0 \/\/\u975eIE\u6d4f\u89c8\u5668\u521b\u5efaXmlHttpRequest\u5bf9\u8c61\r\n\u00a0 \u00a0 if (window.XmlHttpRequest) {\r\n\u00a0 \u00a0 \u00a0 \u00a0 xmlhttp = new XmlHttpRequest();\r\n\u00a0 \u00a0 }\r\n\u00a0 \u00a0 \/\/IE\u6d4f\u89c8\u5668\u521b\u5efaXmlHttpRequest\u5bf9\u8c61\r\n\u00a0 \u00a0 if (window.ActiveXObject) {\r\n\u00a0 \u00a0 \u00a0 \u00a0 try {\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 xmlhttp = new ActiveXObject(\"Microsoft.XMLHTTP\");\r\n\u00a0 \u00a0 \u00a0 \u00a0 }\r\n\u00a0 \u00a0 \u00a0 \u00a0 catch (e) {\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 try {\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 xmlhttp = new ActiveXObject(\"msxml2.XMLHTTP\");\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 catch (ex) { }\r\n\u00a0 \u00a0 \u00a0 \u00a0 }\r\n\u00a0 \u00a0 }\r\n}\r\nfunction Ustbwuyi() {\r\n\u00a0 \u00a0 var data = document.getElementById(\"username\").value;\r\n\u00a0 \u00a0 CreateXmlHttp();\r\n\u00a0 \u00a0 if (!xmlhttp) {\r\n\u00a0 \u00a0 \u00a0 \u00a0 alert(\"\u521b\u5efaxmlhttp\u5bf9\u8c61\u5f02\u5e38\uff01\");\r\n\u00a0 \u00a0 \u00a0 \u00a0 return false;\r\n\u00a0 \u00a0 }\r\n\u00a0 \u00a0 xmlhttp.open(\"POST\", url, false);\r\n\u00a0 \u00a0 xmlhttp.onreadystatechange = function () {\r\n\u00a0 \u00a0 \u00a0 \u00a0 if (xmlhttp.readyState == 4) {\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 document.getElementById(\"user1\").innerHTML = \"\u6570\u636e\u6b63\u5728\u52a0\u8f7d...\";\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if (xmlhttp.status == 200) {\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 document.write(xmlhttp.responseText);\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }\r\n\u00a0 \u00a0 \u00a0 \u00a0 }\r\n\u00a0 \u00a0 }\r\n\u00a0 \u00a0 xmlhttp.send();\r\n}<\/pre>\n
\u5982\u4e0a\u6240\u793a\uff0c\u51fd\u6570\u9996\u5148\u68c0\u67e5XMLHttpRequest\u7684\u6574\u4f53\u72b6\u6001\u5e76\u4e14\u4fdd\u8bc1\u5b83\u5df2\u7ecf\u5b8c\u6210\uff08readyStatus=4\uff09\uff0c\u5373\u6570\u636e\u5df2\u7ecf\u53d1\u9001\u5b8c\u6bd5\u3002\u7136\u540e\u6839\u636e\u670d\u52a1\u5668\u7684\u8bbe\u5b9a\u8be2\u95ee\u8bf7\u6c42\u72b6\u6001\uff0c\u5982\u679c\u4e00\u5207\u5df2\u7ecf\u5c31\u7eea\uff08status=200\uff09\uff0c\u90a3\u4e48\u5c31\u6267\u884c\u4e0b\u9762\u9700\u8981\u7684\u64cd\u4f5c\u3002<\/p>\n
\u5bf9\u4e8eXmlHttpRequest\u7684\u4e24\u4e2a\u65b9\u6cd5\uff0copen\u548csend\uff0c\u5176\u4e2dopen\u65b9\u6cd5\u6307\u5b9a\u4e86\uff1a<\/p>\n
a\u3001\u5411\u670d\u52a1\u5668\u63d0\u4ea4\u6570\u636e\u7684\u7c7b\u578b\uff0c\u5373post\u8fd8\u662fget\u3002<\/p>\n
b\u3001\u8bf7\u6c42\u7684url\u5730\u5740\u548c\u4f20\u9012\u7684\u53c2\u6570\u3002<\/p>\n
c\u3001\u4f20\u8f93\u65b9\u5f0f\uff0cfalse\u4e3a\u540c\u6b65\uff0ctrue\u4e3a\u5f02\u6b65\u3002\u9ed8\u8ba4\u4e3atrue\u3002\u5982\u679c\u662f\u5f02\u6b65\u901a\u4fe1\u65b9\u5f0f(true)\uff0c\u5ba2\u6237\u673a\u5c31\u4e0d\u7b49\u5f85\u670d\u52a1\u5668\u7684\u54cd\u5e94\uff1b\u5982\u679c\u662f\u540c\u6b65\u65b9\u5f0f(false)\uff0c\u5ba2\u6237\u673a\u5c31\u8981\u7b49\u5230\u670d\u52a1\u5668\u8fd4\u56de\u6d88\u606f\u540e\u624d\u53bb\u6267\u884c\u5176\u4ed6\u64cd\u4f5c\u3002\u6211\u4eec\u9700\u8981\u6839\u636e\u5b9e\u9645\u9700\u8981\u6765\u6307\u5b9a\u540c\u6b65\u65b9\u5f0f\uff0c\u5728\u67d0\u4e9b\u9875\u9762\u4e2d\uff0c\u53ef\u80fd\u4f1a\u53d1\u51fa\u591a\u4e2a\u8bf7\u6c42\uff0c\u751a\u81f3\u662f\u6709\u7ec4\u7ec7\u6709\u8ba1\u5212\u6709\u961f\u5f62\u5927\u89c4\u6a21\u7684\u9ad8\u5f3a\u5ea6\u7684request\uff0c\u800c\u540e\u4e00\u4e2a\u662f\u4f1a\u8986\u76d6\u524d\u4e00\u4e2a\u7684\uff0c\u8fd9\u4e2a\u65f6\u5019\u5f53\u7136\u8981\u6307\u5b9a\u540c\u6b65\u65b9\u5f0f\u3002<\/p>\n
Send\u65b9\u6cd5\u7528\u6765\u53d1\u9001\u8bf7\u6c42\u3002<\/p>\n
\u77e5\u9053\u4e86XMLHttpRequest\u7684\u5de5\u4f5c\u6d41\u7a0b\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff0cXMLHttpRequest\u662f\u5b8c\u5168\u7528\u6765\u5411\u670d\u52a1\u5668\u53d1\u51fa\u4e00\u4e2a\u8bf7\u6c42\u7684\uff0c\u5b83\u7684\u4f5c\u7528\u4e5f\u5c40\u9650\u4e8e\u6b64\uff0c\u4f46\u5b83\u7684\u4f5c\u7528\u662f\u6574\u4e2aajax\u5b9e\u73b0\u7684\u5173\u952e\uff0c\u56e0\u4e3aajax\u65e0\u975e\u662f\u4e24\u4e2a\u8fc7\u7a0b\uff0c\u53d1\u51fa\u8bf7\u6c42\u548c\u54cd\u5e94\u8bf7\u6c42\u3002\u5e76\u4e14\u5b83\u5b8c\u5168\u662f\u4e00\u79cd\u5ba2\u6237\u7aef\u7684\u6280\u672f\u3002\u800cXMLHttpRequest\u6b63\u662f\u5904\u7406\u4e86\u670d\u52a1\u5668\u7aef\u548c\u5ba2\u6237\u7aef\u901a\u4fe1\u7684\u95ee\u9898\u6240\u4ee5\u624d\u4f1a\u5982\u6b64\u7684\u91cd\u8981\u3002<\/p>\n
\u73b0\u5728\uff0c\u6211\u4eec\u5bf9ajax\u7684\u539f\u7406\u5927\u6982\u53ef\u4ee5\u6709\u4e00\u4e2a\u4e86\u89e3\u4e86\u3002\u6211\u4eec\u53ef\u4ee5\u628a\u670d\u52a1\u5668\u7aef\u770b\u6210\u4e00\u4e2a\u6570\u636e\u63a5\u53e3\uff0c\u5b83\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u7eaf\u6587\u672c\u6d41\uff0c\u5f53\u7136\uff0c\u8fd9\u4e2a\u6587\u672c\u6d41\u53ef\u4ee5\u662fXML\u683c\u5f0f\uff0c\u53ef\u4ee5\u662fHtml\uff0c\u53ef\u4ee5\u662fJavascript\u4ee3\u7801\uff0c\u4e5f\u53ef\u4ee5\u53ea\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002\u8fd9\u65f6\u5019\uff0cXMLHttpRequest\u5411\u670d\u52a1\u5668\u7aef\u8bf7\u6c42\u8fd9\u4e2a\u9875\u9762\uff0c\u670d\u52a1\u5668\u7aef\u5c06\u6587\u672c\u7684\u7ed3\u679c\u5199\u5165\u9875\u9762\uff0c\u8fd9\u548c\u666e\u901a\u7684web\u5f00\u53d1\u6d41\u7a0b\u662f\u4e00\u6837\u7684\uff0c\u4e0d\u540c\u7684\u662f\uff0c\u5ba2\u6237\u7aef\u5728\u5f02\u6b65\u83b7\u53d6\u8fd9\u4e2a\u7ed3\u679c\u540e\uff0c\u4e0d\u662f\u76f4\u63a5\u663e\u793a\u5728\u9875\u9762\uff0c\u800c\u662f\u5148\u7531javascript\u6765\u5904\u7406\uff0c\u7136\u540e\u518d\u663e\u793a\u5728\u9875\u9762\u3002\u81f3\u4e8e\u73b0\u5728\u6d41\u884c\u7684\u5f88\u591aajax\u63a7\u4ef6\uff0c\u6bd4\u5982magicajax\u7b49\uff0c\u53ef\u4ee5\u8fd4\u56deDataSet\u7b49\u5176\u5b83\u6570\u636e\u7c7b\u578b\uff0c\u53ea\u662f\u5c06\u8fd9\u4e2a\u8fc7\u7a0b\u5c01\u88c5\u4e86\u7684\u7ed3\u679c\uff0c\u672c\u8d28\u4e0a\u4ed6\u4eec\u5e76\u6ca1\u6709\u4ec0\u4e48\u592a\u5927\u7684\u533a\u522b\u3002<\/p>\n
7\u3001ajax\u7684\u4f18\u70b9<\/strong><\/p>\n
Ajax\u7684\u7ed9\u6211\u4eec\u5e26\u6765\u7684\u597d\u5904\u5927\u5bb6\u57fa\u672c\u4e0a\u90fd\u6df1\u6709\u4f53\u4f1a\uff0c\u5728\u8fd9\u91cc\u6211\u53ea\u7b80\u5355\u7684\u8bb2\u51e0\u70b9\uff1a<\/p>\n
1\u3001\u6700\u5927\u7684\u4e00\u70b9\u662f\u9875\u9762\u65e0\u5237\u65b0\uff0c\u5728\u9875\u9762\u5185\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\uff0c\u7ed9\u7528\u6237\u7684\u4f53\u9a8c\u975e\u5e38\u597d\u3002<\/p>\n
2\u3001\u4f7f\u7528\u5f02\u6b65\u65b9\u5f0f\u4e0e\u670d\u52a1\u5668\u901a\u4fe1\uff0c\u4e0d\u9700\u8981\u6253\u65ad\u7528\u6237\u7684\u64cd\u4f5c\uff0c\u5177\u6709\u66f4\u52a0\u8fc5\u901f\u7684\u54cd\u5e94\u80fd\u529b\u3002<\/p>\n
3\u3001\u53ef\u4ee5\u628a\u4ee5\u524d\u4e00\u4e9b\u670d\u52a1\u5668\u8d1f\u62c5\u7684\u5de5\u4f5c\u8f6c\u5ac1\u5230\u5ba2\u6237\u7aef\uff0c\u5229\u7528\u5ba2\u6237\u7aef\u95f2\u7f6e\u7684\u80fd\u529b\u6765\u5904\u7406\uff0c\u51cf\u8f7b\u670d\u52a1\u5668\u548c\u5e26\u5bbd\u7684\u8d1f\u62c5\uff0c\u8282\u7ea6\u7a7a\u95f4\u548c\u5bbd\u5e26\u79df\u7528\u6210\u672c\u3002\u5e76\u4e14\u51cf\u8f7b\u670d\u52a1\u5668\u7684\u8d1f\u62c5\uff0cajax\u7684\u539f\u5219\u662f\u201c\u6309\u9700\u53d6\u6570\u636e\u201d\uff0c\u53ef\u4ee5\u6700\u5927\u7a0b\u5ea6\u7684\u51cf\u5c11\u5197\u4f59\u8bf7\u6c42\uff0c\u548c\u54cd\u5e94\u5bf9\u670d\u52a1\u5668\u9020\u6210\u7684\u8d1f\u62c5\u3002<\/p>\n
4\u3001\u57fa\u4e8e\u6807\u51c6\u5316\u7684\u5e76\u88ab\u5e7f\u6cdb\u652f\u6301\u7684\u6280\u672f\uff0c\u4e0d\u9700\u8981\u4e0b\u8f7d\u63d2\u4ef6\u6216\u8005\u5c0f\u7a0b\u5e8f\u3002<\/p>\n
8\u3001ajax\u7684\u7f3a\u70b9<\/strong><\/p>\n
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