Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin
，，webservice服務中，webConfig中添加以上配置，缺一不可 ...
原文：Received an invalid response. Origin 'null' is therefore not allowed access
Received an invalid response. Origin null is therefore not allowed access. 今天在做二級聯動，使用ajax請求xml數據，在用ie 與chrome做測試時就出現了這句話，看到網上也有說跨域等其他，更改瀏覽器等...... 我的解決方法：我把它放在iis服務器進行測試，請求數據就正常了 ...
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