\u6211\u4eec\u77e5\u9053\uff0c\u5728\u53d1\u9001ajax\u8bf7\u6c42\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u901a\u8fc7xmlHttpRequest\u8fd9\u4e2a\u5bf9\u8c61\uff0c\u521b\u5efa\u81ea\u5b9a\u4e49\u7684header\u5934\u4fe1\u606f\uff0c \u5728jquery\u6846\u67b6\u4e2d\uff0c\u5bf9\u4e8e\u901a\u8fc7\u5b83\u7684$.ajax, $.get, \u6216\u8005$.post\u65b9\u6cd5\u8bf7\u6c42\u7f51\u9875\u5185\u5bb9\u65f6\uff0c\u5b83\u4f1a\u5411\u670d\u52a1\u5668\u4f20\u9012\u4e00\u4e2aHTTP_X_REQUESTED_WITH\u7684\u53c2\u6570\uff0cphp\u4e2d\u5c31\u662f\u5728header\u4e00\u5c42\u5224\u65ad\u662f\u5426\u662fajax\u8bf7\u6c42\uff0c\u5bf9\u5e94\u7684\u6839\u636e$_SERVER['HTTP_X_REQUESTED_WITH']\u5224\u65ad\u3002\u4e00\u822c\u60c5\u51b5\u4e0b$_SERVER['HTTP_X_REQUESTED_WITH']\u9ed8\u8ba4\u662fxmlHttpRequest\uff0c$_SERVER['HTTP_X_REQUESTED_WITH']\u4e5f\u53ef\u4ee5\u81ea\u5b9a\u4e49\u521b\u5efa\u7684\uff0c\u4f7f\u7528xmlHttpRequest.setRequestHeader(name,value)\u3002 \u793a\u4f8b\uff1a\u524d\u7aef\u9875\u9762\u53d1\u9001\u666e\u901a\u7684ajax\u8bf7\u6c42\u7ed9\u540e\u7aeftest.php\u3002
\n$.ajax({
\n type: \"GET\",
\n url: 'test.php',
\n success: function(data) {
\n console.log(data);
\n }
\n});
\n\u590d\u5236\u4ee3\u7801
\n\u670d\u52a1\u7aeftest.php\u53ef\u4ee5\u5224\u65ad\u8be5\u8bf7\u6c42\u662f\u4e0d\u662fAjax\u5f02\u6b65\u8bf7\u6c42\uff0c\u7136\u540e\u6839\u636e\u4e1a\u52a1\u9700\u6c42\u505a\u51fa\u54cd\u5e94\u7684\u56de\u5e94\u3002 \u4ee5\u4e0b\u662f\u670d\u52a1\u7aeftest.php\u7684\u7b80\u5355\u9a8c\u8bc1\u662f\u5426\u4e3aajax\u8bf7\u6c42\u7684\u4ee3\u7801\uff1a
\nfunction isAjax() {
\n return @$_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' ? true : false;
\n} <\/p>\n
if (isAjax()) {
\n echo 'Ajax Request Success.';
\n} else {
\n echo 'No.';
\n}
\nAjax\u53d1\u8d77JSONP\u8de8\u57df\u8bf7\u6c42 \u6211\u4eec\u901a\u8fc7jQuery\u7684JSONP\u65b9\u5f0f\u53ef\u4ee5\u5b9e\u73b0\u8de8\u57dfajax\u8bf7\u6c42\uff0c\u670d\u52a1\u7aefphp\u4e5f\u9700\u8981\u505a\u51fa\u76f8\u5e94\u7684\u5904\u7406\uff0c\u4e5f\u5c31\u662f\u8bf4php\u8fd9\u8fb9\u5fc5\u987b\u548c\u524d\u7aef\u9875\u9762\u6309\u7167\u4e00\u5b9a\u7684\u683c\u5f0f\u8bf7\u6c42\u548c\u8fd4\u56de\u6570\u636e\u3002 \u793a\u4f8b\uff1a\u524d\u7aef\u9875\u9762\u53d1\u8d77JSONP\u8bf7\u6c42\uff1a
\n$.ajax({
\n type: \"get\",
\n data: \"random=\"+Math.random(),
\n url: \"http:\/\/demo.thinkphp.net\/phpajax\/jsonp.php\",
\n dataType: \"jsonp\",
\n jsonp: \"callback\",
\n success: function(data) {
\n console.log(data);
\n },
\n error: function() {
\n console.log('Request Error.');
\n }
\n});
\n\u590d\u5236\u4ee3\u7801
\n\u6211\u4eec\u4f1a\u53d1\u73b0\uff0cajax\u8bf7\u6c42\u53c2\u6570\u4e2d\u6709dataType: \"jsonp\"\u548cjsonp: \"callback\"\uff0c\u8fd9\u4e2a\u5c31\u8868\u660e\u4e86\u6211\u8981\u8bf7\u6c42\u7684\u662fjsonp\uff0c\u5e76\u4e14\u4f1a\u6709\u56de\u8c03callback\u8fd4\u56de\u3002\u5f53\u7136\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u81ea\u5b9a\u4e49\u56de\u8c03\u51fd\u6570\uff0c\u5982jsonpCallback:\"success_jsonpCallback\" \u8fd8\u53ef\u4ee5\u7b80\u5355\u7684\u5199\u6210\uff1a
\njQuery.getJSON('http:\/\/demo.thinkphp.net\/phpajax\/jsonp.php?callback=?\",{
\n random: Math.random()
\n}, function(data){
\n console.log(data);
\n});
\n\u590d\u5236\u4ee3\u7801
\nphp\u540e\u7aef\u670d\u52a1\u4ee3\u7801\u53ef\u4ee5\u8fd9\u6837\u5199\uff08\u6ce8\u610f\u8f93\u51fa\u8fd4\u56de\u7684\u683c\u5f0f\uff09\uff1a
\n$data = array(
\n 'rand' => $_GET['random'],
\n 'msg' => 'Success'
\n);
\necho $_GET['callback'].'('.json_encode($data).')';
\n\u590d\u5236\u4ee3\u7801
\nAjax\u8de8\u57df\u8bf7\u6c42\uff1aCORS CORS\uff0c\u53c8\u79f0\u8de8\u57df\u8d44\u6e90\u5171\u4eab\uff0c\u82f1\u6587\u5168\u79f0Cross-Origin Resource Sharing\u3002\u5047\u8bbe\u6211\u4eec\u60f3\u4f7f\u7528Ajax\u4ecea.com\u7684\u9875\u9762\u4e0a\u5411b.com\u7684\u9875\u9762\u4e0a\u8981\u70b9\u6570\u636e\uff0c\u901a\u5e38\u60c5\u51b5\u7531\u4e8e\u540c\u6e90\u7b56\u7565\uff0c\u8fd9\u79cd\u8bf7\u6c42\u662f\u4e0d\u5141\u8bb8\u7684\uff0c\u6d4f\u89c8\u5668\u4e5f\u4f1a\u8fd4\u56de\u201c\u6e90\u4e0d\u5339\u914d\u201d\u7684\u9519\u8bef\uff0c\u6240\u4ee5\u5c31\u6709\u4e86\u201c\u8de8\u57df\u201d\u8fd9\u4e2a\u8bf4\u6cd5\u3002\u4f46\u662f\u6211\u4eec\u4e5f\u6709\u89e3\u51b3\u529e\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u518db.com\u7684\u9875\u9762header\u4fe1\u606f\u4e2d\u589e\u52a0\u4e00\u884c\u4ee3\u7801\uff1a
\nheader(\"Access-Control-Allow-Origin: *\");
\n\u5f53\u6211\u4eec\u8bbe\u7f6e\u7684header\u4e3a\u4ee5\u4e0a\u4fe1\u606f\u65f6\uff0c\u4efb\u610f\u4e00\u4e2a\u8bf7\u6c42\u8fc7\u6765\u4e4b\u540e\u670d\u52a1\u7aef\u6211\u4eec\u90fd\u53ef\u4ee5\u8fdb\u884c\u5904\u7406\u548c\u54cd\u5e94\uff0c\u90a3\u4e48\u5728\u8c03\u8bd5\u5de5\u5177\u4e2d\u53ef\u4ee5\u770b\u5230\u5176\u5934\u4fe1\u606f\u8bbe\u7f6e\uff0c\u5176\u4e2d\u89c1\u7ea2\u6846\u4e2d\u6709\u4e00\u9879\u4fe1\u606f\u662f\u201c*Access-Control-Allow-Origin\uff1a* \u201d\uff0c\u8868\u793a\u6211\u4eec\u5df2\u7ecf\u542f\u7528CORS\uff0c\u5982\u679c\u8981\u9650\u5236\u53ea\u5141\u8bb8\u67d0\u4e2a\u57df\u540d\u7684\u8bf7\u6c42\uff0c\u53ef\u4ee5\u8fd9\u6837\uff1a
\nheader(\"Access-Control-Allow-Origin: http:\/\/www.thinkphp.com\");
\n\u590d\u5236\u4ee3\u7801
\n\u793a\u4f8b\uff1a\u901a\u8fc7CORS\u8de8\u57df\u8bf7\u6c42\u6570\u636e
\n$.ajax({
\n type: \"get\",
\n data: \"random=\"+Math.random(),
\n url: \"http:\/\/demo.thinkphp.net\/phpajax\/ajax.php\",
\n dataType: \"json\",
\n success: function(data) {
\n console.log(data);
\n $(\"#result_3\").html(data.msg+':'+data.rand);
\n },
\n error: function() {
\n $(\"#result_3\").html('Request Error.');
\n }
\n});
\n\u6211\u4eec\u5728\u53e6\u4e00\u4e2a\u7f51\u7ad9\u57df\u540d\u4e0b\u7684ajax.php\u52a0\u4e0a\u8fd9\u6837\u7684\u4ee3\u7801\uff1a
\nheader(\"Access-Control-Allow-Origin: http:\/\/www.thinkphp.com\"); <\/p>\n
$data = array(
\n 'rand' => $_GET['random'],
\n 'msg' => 'Success'
\n);
\necho json_encode($data);<\/p>\n","protected":false},"excerpt":{"rendered":"\u6211\u4eec\u77e5\u9053\uff0c\u5728\u53d1\u9001ajax\u8bf7\u6c42\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u901a\u8fc7xmlHttpRequest\u8fd9\u4e2a\u5bf9\u8c61\uff0c\u521b\u5efa\u81ea\u5b9a\u4e49\u7684header\u5934\u4fe1\u606f\uff0c \u5728jquery\u6846\u67b6\u4e2d\uff0c\u5bf9\u4e8e\u901a\u8fc7\u5b83\u7684$.ajax, $.get, \u6216\u8005$.post\u65b9\u6cd5 \u00b7\u00b7\u00b7","protected":false},"author":8851,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[455],"tags":[],"class_list":["post-2601","post","type-post","status-publish","format-standard","hentry","category-jiaocheng"],"views":3781,"_links":{"self":[{"href":"https:\/\/www.daycode.net\/api\/wp\/v2\/posts\/2601"}],"collection":[{"href":"https:\/\/www.daycode.net\/api\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.daycode.net\/api\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.daycode.net\/api\/wp\/v2\/users\/8851"}],"replies":[{"embeddable":true,"href":"https:\/\/www.daycode.net\/api\/wp\/v2\/comments?post=2601"}],"version-history":[{"count":0,"href":"https:\/\/www.daycode.net\/api\/wp\/v2\/posts\/2601\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.daycode.net\/api\/wp\/v2\/media?parent=2601"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.daycode.net\/api\/wp\/v2\/categories?post=2601"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.daycode.net\/api\/wp\/v2\/tags?post=2601"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}