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场景：我的本地网页服务器无法访问本地的接口服务器接口提示一下错误：大致意思是：是一个跨域请求我的没有访问该地址的权限（接口服务器采用的是PHP编写）
XMLHttpRequest cannot load http://localhost/mz/goods/getList. Response to preflight request doesn‘t pass access control check: No ‘Access-Control-Allow-Origin‘ header is present on the requested resource. Origin ‘http://127.0.0.1:8020‘ is therefore not allowed access.
解决方案：
header(‘Access-Control-Allow-Origin: *‘); header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept"); header(‘Access-Control-Allow-Methods: GET, POST, PUT‘);
为ajaxReturn 方法设置允许跨域访问的请求头。
参考地址：http://blog.sina.com.cn/s/blog_6751f30b0102w2x1.html，http://stackoverflow.com/questions/20433655/no-access-control-allow-origin-header-is-present-on-the-requested-resource-or
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原文地址：http://www.cnblogs.com/cbread/p/5450630.html
