{"id":29,"date":"2021-01-06T18:31:20","date_gmt":"2021-01-06T10:31:20","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/webplus\/?p=29"},"modified":"2021-01-06T21:11:34","modified_gmt":"2021-01-06T13:11:34","slug":"ajax-%e7%9a%84%e5%8e%9f%e7%94%9f-js-%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/javascript\/post-29.html","title":{"rendered":"ajax \u7684\u539f\u751f js \u5b9e\u73b0"},"content":{"rendered":"\n<p>\u8fd9\u91cc\u4ecb\u7ecd ajax \u7684\u539f\u751f js \u5b9e\u73b0\u65b9\u5f0f<\/p>\n\n\n\n<h5>1.\u521b\u5efa\u6838\u5fc3\u5bf9\u8c61 xmlhttp<\/h5>\n\n\n\n<p>\u5bf9\u4e8e\u4e0d\u540c\u6d4f\u89c8\u5668\u7684\u521b\u5efa\u65b9\u6cd5\u662f\u4e0d\u540c\u7684\uff0c\u4e0b\u9762\u7684\u4ee3\u7801\u5c31\u53ef\u4ee5\u517c\u5bb9<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var xmlhttp;\nif (window.XMLHttpRequest)\n{\/\/ code for IE7+, Firefox, Chrome, Opera, Safari\n\txmlhttp=new XMLHttpRequest();\n}\nelse\n{\/\/ code for IE6, IE5\n\txmlhttp=new ActiveXObject(\"Microsoft.XMLHTTP\");\n}\n<\/code><\/pre>\n\n\n\n<h5>2.\u901a\u8fc7 xmlhttp \u5bf9\u8c61\u7684 open \u65b9\u6cd5\u5efa\u7acb\u8fde\u63a5<\/h5>\n\n\n\n<p>\u8fd9\u91cc\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u53d1\u9001\u65b9\u6cd5\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f url \uff0c\u7b2c\u4e09\u4e2a\u53c2\u6570\u662f\u51b3\u5b9a\u5f02\u6b65<\/p>\n\n\n\n<p>\uff08get\u53c2\u6570\u62fc\u63a5\u5728url\u540e\uff0csend\u65b9\u6cd5\u4e3a\u7a7a\uff0c\u800cpost\u53c2\u6570\u5fc5\u987b\u5728send\u65b9\u6cd5\u4e2d\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>xmlhttp.open(\"GET\",\"ajaxServlet?username=tom\",true);<\/code><\/pre>\n\n\n\n<h5>3.\u901a\u8fc7 xmlhttp \u5bf9\u8c61\u7684 send \u65b9\u6cd5\u5f00\u59cb\u53d1\u9001<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>xmlhttp.send();<\/code><\/pre>\n\n\n\n<h5>4.\u63a5\u6536\u5e76\u5904\u7406\u54cd\u5e94\u7ed3\u679c<\/h5>\n\n\n\n<p>\u5f53xmlhttp\u5bf9\u8c61\u7684\u5c31\u7eea\u72b6\u6001\u6539\u53d8\u65f6\uff0c\u89e6\u53d1\u4e8b\u4ef6onreadystatechange, \u5224\u65ad\u662f\u5426\u5c31\u7eea<\/p>\n\n\n\n<p>(\u8fd4\u56de\u7684\u7ed3\u679c\u662f xmlhttp.responseText\uff0c\u8fd9\u91cc\u53ea\u662f alert \u4e00\u4e0b\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>xmlhttp.onreadystatechange=function()\r\n{\r\n\t\/\/\u5224\u65adreadyState\u5c31\u7eea\u72b6\u6001\u662f\u5426\u4e3a4\uff0c\u5224\u65adstatus\u54cd\u5e94\u72b6\u6001\u7801\u662f\u5426\u4e3a200\r\n\tif (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200)\r\n\t{\r\n\t   \/\/\u83b7\u53d6\u670d\u52a1\u5668\u7684\u54cd\u5e94\u7ed3\u679c\r\n\t\tvar responseText = xmlhttp.responseText;\r\n\t\talert(responseText);\r\n\t}\r\n}\r<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u91cc\u4ecb\u7ecd ajax \u7684\u539f\u751f js \u5b9e\u73b0\u65b9\u5f0f 1.\u521b\u5efa\u6838\u5fc3\u5bf9\u8c61 xmlhttp \u5bf9\u4e8e\u4e0d\u540c\u6d4f\u89c8\u5668\u7684\u521b\u5efa\u65b9\u6cd5\u662f\u4e0d\u540c\u7684&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/javascript\/post-29.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">ajax \u7684\u539f\u751f js \u5b9e\u73b0<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts\/29"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/comments?post=29"}],"version-history":[{"count":3,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts\/29\/revisions"}],"predecessor-version":[{"id":35,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts\/29\/revisions\/35"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/media?parent=29"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/categories?post=29"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/tags?post=29"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}