跨域请求的三种解决
Posted makalochen
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第一种：jsonp的方式
<?php header(‘Content-type: application/json‘); //获取回调函数名 $jsoncallback = $_GET[‘jsoncallback‘]; //json数据 $json_data = ‘{"data":[{"did":"29","deptName":"u8f6fu4ef6u90e8"}, {"did":"30","deptName":"u8f6fu4ef6u90e8"}, {"did":"31","deptName":"u6d4bu8bd5u90e8"}, {"did":"32","deptName":"u786cu4ef6u90e8"}, {"did":"33","deptName":"u54c1u8d28u90e8"}, {"did":"34","deptName":"u786cu4ef6u90e8"}, {"did":"35","deptName":"u5236u9020u4e2du5fc3"}, {"did":"36","deptName":"u91c7u8d2du90e8"}, {"did":"37","deptName":"u751fu4ea7u90e8"}, {"did":"38","deptName":"u603bu7ecfu529e"}, {"did":"39","deptName":"u9500u552eu90e8"}, {"did":"40","deptName":"u8d22u52a1u90e8"}, {"did":"41","deptName":"u4f01u5212u90e8"}, {"did":"42","deptName":"u8bbeu8ba1u90e8"}, {"did":"43","deptName":"u4ebau8d44u90e8"}, {"did":"44","deptName":"u884cu653fu90e8"}, {"did":"45","deptName":"u4ebau4e8bu90e8"}, {"did":"46","deptName":"u7ef4u4feeu90e8"}, {"did":"47","deptName":"u4ed3u50a8u90e8"}]}‘; //输出jsonp格式的数据 echo $jsoncallback . "(" . $json_data . ")"; ?>
第二种：在后端添加允许跨域的请求头
<?php // 允许 ityangs.net 发起的跨域请求 //header("Access-Control-Allow-Origin: ityangs.net"); // 允许 ityangs.net 发起的跨域请求 header("Access-Control-Allow-Origin: *"); echo ‘{"data":[{"did":"29","deptName":"u8f6fu4ef6u90e8"}, {"did":"30","deptName":"u8f6fu4ef6u90e8"}, {"did":"31","deptName":"u6d4bu8bd5u90e8"}, {"did":"32","deptName":"u786cu4ef6u90e8"}, {"did":"33","deptName":"u54c1u8d28u90e8"}, {"did":"34","deptName":"u786cu4ef6u90e8"}, {"did":"35","deptName":"u5236u9020u4e2du5fc3"}, {"did":"36","deptName":"u91c7u8d2du90e8"}, {"did":"37","deptName":"u751fu4ea7u90e8"}, {"did":"38","deptName":"u603bu7ecfu529e"}, {"did":"39","deptName":"u9500u552eu90e8"}, {"did":"40","deptName":"u8d22u52a1u90e8"}, {"did":"41","deptName":"u4f01u5212u90e8"}, {"did":"42","deptName":"u8bbeu8ba1u90e8"}, {"did":"43","deptName":"u4ebau8d44u90e8"}, {"did":"44","deptName":"u884cu653fu90e8"}, {"did":"45","deptName":"u4ebau4e8bu90e8"}, {"did":"46","deptName":"u7ef4u4feeu90e8"}, {"did":"47","deptName":"u4ed3u50a8u90e8"}]}‘; ?>
第三种：代理请求，由后端去访问要跨域的请求的内容并返回，然后页面访问本地后端
<?php $url=‘http://192.168.192.130/test2.php‘; $html= file_get_contents($url); echo $html; ?>
页面调用方式：
<!DOCTYPE html> <html> <head id="head"> <meta charset="UTF-8"> <title></title> <!--第一种，需要在后端提供写js的回调函数,jsonp方式--> <!--<script> function callbackFunction(result){ alert(result.data[0].deptName); } </script> <script type="text/javascript" src="http://192.168.192.130/test.php?jsoncallback=callbackFunction"></script>--> <!--第二种，在后端添加，允许跨域请求的请求头--> <!--// 允许 ityangs.net 发起的跨域请求 //header("Access-Control-Allow-Origin: ityangs.net"); // 允许 ityangs.net 发起的跨域请求 header("Access-Control-Allow-Origin: *");--> <!--第三种，由后端抓取要跨域的请求的内容，然后页面访问本地后端--> </head> <body> <script> var xmlhttp; if (window.XMLHttpRequest){ // IE7+, Firefox, Chrome, Opera, Safari 浏览器执行的代码 xmlhttp = new XMLHttpRequest(); }else{ //IE6, IE5 浏览器执行的代码 xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function(){ if (xmlhttp.readyState==4 && xmlhttp.status==200){ var obj = JSON.parse(xmlhttp.responseText); alert(xmlhttp.responseText); } } //GET方式访问,true为异步，false为异步 xmlhttp.open("GET","http://192.168.192.130/test2.php",false); xmlhttp.send(); </script> </body> </html>
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