No 'Access-Control-Allow-Origin' header is present on the requested resource.'Ajax跨域访问解决方案
1、什么是跨域访问
举个栗子：在A网站中，咱们但愿使用Ajax来得到B网站中的特定内容。若是A网站与B网站不在同一个域中，那么就出现了跨域访问问题。你能够理解为两个域名之间不能跨过域名来发送请求或者请求数据，不然就是不安全的。跨域访问违反了同源策略，同源策略的详细信息能够点击以下连接：Same-origin_policy；
总而言之，同源策略规定，浏览器的ajax只能访问跟它的HTML页面同源（
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